2005-04-16 16:20:36 -06:00
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#ifndef _LINUX_HUGETLB_H
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#define _LINUX_HUGETLB_H
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2007-07-29 16:36:13 -06:00
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#include <linux/fs.h>
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2009-09-24 15:47:45 -06:00
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struct ctl_table;
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struct user_struct;
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2005-04-16 16:20:36 -06:00
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#ifdef CONFIG_HUGETLB_PAGE
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#include <linux/mempolicy.h>
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2007-03-01 16:46:08 -07:00
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#include <linux/shm.h>
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2005-06-21 18:14:44 -06:00
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#include <asm/tlbflush.h>
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2005-04-16 16:20:36 -06:00
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mm: introduce PageHuge() for testing huge/gigantic pages
A series of patches to enhance the /proc/pagemap interface and to add a
userspace executable which can be used to present the pagemap data.
Export 10 more flags to end users (and more for kernel developers):
11. KPF_MMAP (pseudo flag) memory mapped page
12. KPF_ANON (pseudo flag) memory mapped page (anonymous)
13. KPF_SWAPCACHE page is in swap cache
14. KPF_SWAPBACKED page is swap/RAM backed
15. KPF_COMPOUND_HEAD (*)
16. KPF_COMPOUND_TAIL (*)
17. KPF_HUGE hugeTLB pages
18. KPF_UNEVICTABLE page is in the unevictable LRU list
19. KPF_HWPOISON hardware detected corruption
20. KPF_NOPAGE (pseudo flag) no page frame at the address
(*) For compound pages, exporting _both_ head/tail info enables
users to tell where a compound page starts/ends, and its order.
a simple demo of the page-types tool
# ./page-types -h
page-types [options]
-r|--raw Raw mode, for kernel developers
-a|--addr addr-spec Walk a range of pages
-b|--bits bits-spec Walk pages with specified bits
-l|--list Show page details in ranges
-L|--list-each Show page details one by one
-N|--no-summary Don't show summay info
-h|--help Show this usage message
addr-spec:
N one page at offset N (unit: pages)
N+M pages range from N to N+M-1
N,M pages range from N to M-1
N, pages range from N to end
,M pages range from 0 to M
bits-spec:
bit1,bit2 (flags & (bit1|bit2)) != 0
bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1
bit1,~bit2 (flags & (bit1|bit2)) == bit1
=bit1,bit2 flags == (bit1|bit2)
bit-names:
locked error referenced uptodate
dirty lru active slab
writeback reclaim buddy mmap
anonymous swapcache swapbacked compound_head
compound_tail huge unevictable hwpoison
nopage reserved(r) mlocked(r) mappedtodisk(r)
private(r) private_2(r) owner_private(r) arch(r)
uncached(r) readahead(o) slob_free(o) slub_frozen(o)
slub_debug(o)
(r) raw mode bits (o) overloaded bits
# ./page-types
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000000 487369 1903 _________________________________
0x0000000000000014 5 0 __R_D____________________________ referenced,dirty
0x0000000000000020 1 0 _____l___________________________ lru
0x0000000000000024 34 0 __R__l___________________________ referenced,lru
0x0000000000000028 3838 14 ___U_l___________________________ uptodate,lru
0x0001000000000028 48 0 ___U_l_______________________I___ uptodate,lru,readahead
0x000000000000002c 6478 25 __RU_l___________________________ referenced,uptodate,lru
0x000100000000002c 47 0 __RU_l_______________________I___ referenced,uptodate,lru,readahead
0x0000000000000040 8344 32 ______A__________________________ active
0x0000000000000060 1 0 _____lA__________________________ lru,active
0x0000000000000068 348 1 ___U_lA__________________________ uptodate,lru,active
0x0001000000000068 12 0 ___U_lA______________________I___ uptodate,lru,active,readahead
0x000000000000006c 988 3 __RU_lA__________________________ referenced,uptodate,lru,active
0x000100000000006c 48 0 __RU_lA______________________I___ referenced,uptodate,lru,active,readahead
0x0000000000004078 1 0 ___UDlA_______b__________________ uptodate,dirty,lru,active,swapbacked
0x000000000000407c 34 0 __RUDlA_______b__________________ referenced,uptodate,dirty,lru,active,swapbacked
0x0000000000000400 503 1 __________B______________________ buddy
0x0000000000000804 1 0 __R________M_____________________ referenced,mmap
0x0000000000000828 1029 4 ___U_l_____M_____________________ uptodate,lru,mmap
0x0001000000000828 43 0 ___U_l_____M_________________I___ uptodate,lru,mmap,readahead
0x000000000000082c 382 1 __RU_l_____M_____________________ referenced,uptodate,lru,mmap
0x000100000000082c 12 0 __RU_l_____M_________________I___ referenced,uptodate,lru,mmap,readahead
0x0000000000000868 192 0 ___U_lA____M_____________________ uptodate,lru,active,mmap
0x0001000000000868 12 0 ___U_lA____M_________________I___ uptodate,lru,active,mmap,readahead
0x000000000000086c 800 3 __RU_lA____M_____________________ referenced,uptodate,lru,active,mmap
0x000100000000086c 31 0 __RU_lA____M_________________I___ referenced,uptodate,lru,active,mmap,readahead
0x0000000000004878 2 0 ___UDlA____M__b__________________ uptodate,dirty,lru,active,mmap,swapbacked
0x0000000000001000 492 1 ____________a____________________ anonymous
0x0000000000005808 4 0 ___U_______Ma_b__________________ uptodate,mmap,anonymous,swapbacked
0x0000000000005868 2839 11 ___U_lA____Ma_b__________________ uptodate,lru,active,mmap,anonymous,swapbacked
0x000000000000586c 30 0 __RU_lA____Ma_b__________________ referenced,uptodate,lru,active,mmap,anonymous,swapbacked
total 513968 2007
# ./page-types -r
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000000 468002 1828 _________________________________
0x0000000100000000 19102 74 _____________________r___________ reserved
0x0000000000008000 41 0 _______________H_________________ compound_head
0x0000000000010000 188 0 ________________T________________ compound_tail
0x0000000000008014 1 0 __R_D__________H_________________ referenced,dirty,compound_head
0x0000000000010014 4 0 __R_D___________T________________ referenced,dirty,compound_tail
0x0000000000000020 1 0 _____l___________________________ lru
0x0000000800000024 34 0 __R__l__________________P________ referenced,lru,private
0x0000000000000028 3794 14 ___U_l___________________________ uptodate,lru
0x0001000000000028 46 0 ___U_l_______________________I___ uptodate,lru,readahead
0x0000000400000028 44 0 ___U_l_________________d_________ uptodate,lru,mappedtodisk
0x0001000400000028 2 0 ___U_l_________________d_____I___ uptodate,lru,mappedtodisk,readahead
0x000000000000002c 6434 25 __RU_l___________________________ referenced,uptodate,lru
0x000100000000002c 47 0 __RU_l_______________________I___ referenced,uptodate,lru,readahead
0x000000040000002c 14 0 __RU_l_________________d_________ referenced,uptodate,lru,mappedtodisk
0x000000080000002c 30 0 __RU_l__________________P________ referenced,uptodate,lru,private
0x0000000800000040 8124 31 ______A_________________P________ active,private
0x0000000000000040 219 0 ______A__________________________ active
0x0000000800000060 1 0 _____lA_________________P________ lru,active,private
0x0000000000000068 322 1 ___U_lA__________________________ uptodate,lru,active
0x0001000000000068 12 0 ___U_lA______________________I___ uptodate,lru,active,readahead
0x0000000400000068 13 0 ___U_lA________________d_________ uptodate,lru,active,mappedtodisk
0x0000000800000068 12 0 ___U_lA_________________P________ uptodate,lru,active,private
0x000000000000006c 977 3 __RU_lA__________________________ referenced,uptodate,lru,active
0x000100000000006c 48 0 __RU_lA______________________I___ referenced,uptodate,lru,active,readahead
0x000000040000006c 5 0 __RU_lA________________d_________ referenced,uptodate,lru,active,mappedtodisk
0x000000080000006c 3 0 __RU_lA_________________P________ referenced,uptodate,lru,active,private
0x0000000c0000006c 3 0 __RU_lA________________dP________ referenced,uptodate,lru,active,mappedtodisk,private
0x0000000c00000068 1 0 ___U_lA________________dP________ uptodate,lru,active,mappedtodisk,private
0x0000000000004078 1 0 ___UDlA_______b__________________ uptodate,dirty,lru,active,swapbacked
0x000000000000407c 34 0 __RUDlA_______b__________________ referenced,uptodate,dirty,lru,active,swapbacked
0x0000000000000400 538 2 __________B______________________ buddy
0x0000000000000804 1 0 __R________M_____________________ referenced,mmap
0x0000000000000828 1029 4 ___U_l_____M_____________________ uptodate,lru,mmap
0x0001000000000828 43 0 ___U_l_____M_________________I___ uptodate,lru,mmap,readahead
0x000000000000082c 382 1 __RU_l_____M_____________________ referenced,uptodate,lru,mmap
0x000100000000082c 12 0 __RU_l_____M_________________I___ referenced,uptodate,lru,mmap,readahead
0x0000000000000868 192 0 ___U_lA____M_____________________ uptodate,lru,active,mmap
0x0001000000000868 12 0 ___U_lA____M_________________I___ uptodate,lru,active,mmap,readahead
0x000000000000086c 800 3 __RU_lA____M_____________________ referenced,uptodate,lru,active,mmap
0x000100000000086c 31 0 __RU_lA____M_________________I___ referenced,uptodate,lru,active,mmap,readahead
0x0000000000004878 2 0 ___UDlA____M__b__________________ uptodate,dirty,lru,active,mmap,swapbacked
0x0000000000001000 492 1 ____________a____________________ anonymous
0x0000000000005008 2 0 ___U________a_b__________________ uptodate,anonymous,swapbacked
0x0000000000005808 4 0 ___U_______Ma_b__________________ uptodate,mmap,anonymous,swapbacked
0x000000000000580c 1 0 __RU_______Ma_b__________________ referenced,uptodate,mmap,anonymous,swapbacked
0x0000000000005868 2839 11 ___U_lA____Ma_b__________________ uptodate,lru,active,mmap,anonymous,swapbacked
0x000000000000586c 29 0 __RU_lA____Ma_b__________________ referenced,uptodate,lru,active,mmap,anonymous,swapbacked
total 513968 2007
# ./page-types --raw --list --no-summary --bits reserved
offset count flags
0 15 _____________________r___________
31 4 _____________________r___________
159 97 _____________________r___________
4096 2067 _____________________r___________
6752 2390 _____________________r___________
9355 3 _____________________r___________
9728 14526 _____________________r___________
This patch:
Introduce PageHuge(), which identifies huge/gigantic pages by their
dedicated compound destructor functions.
Also move prep_compound_gigantic_page() to hugetlb.c and make
__free_pages_ok() non-static.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 16:32:22 -06:00
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int PageHuge(struct page *page);
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2005-04-16 16:20:36 -06:00
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static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
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{
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return vma->vm_flags & VM_HUGETLB;
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}
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2008-07-23 22:27:23 -06:00
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void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
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2009-09-23 16:57:19 -06:00
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int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
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int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
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int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
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2005-04-16 16:20:36 -06:00
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int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
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2009-09-21 18:03:27 -06:00
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int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
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struct page **, struct vm_area_struct **,
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unsigned long *, int *, int, unsigned int flags);
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hugetlb: guarantee that COW faults for a process that called mmap(MAP_PRIVATE) on hugetlbfs will succeed
After patch 2 in this series, a process that successfully calls mmap() for
a MAP_PRIVATE mapping will be guaranteed to successfully fault until a
process calls fork(). At that point, the next write fault from the parent
could fail due to COW if the child still has a reference.
We only reserve pages for the parent but a copy must be made to avoid
leaking data from the parent to the child after fork(). Reserves could be
taken for both parent and child at fork time to guarantee faults but if
the mapping is large it is highly likely we will not have sufficient pages
for the reservation, and it is common to fork only to exec() immediatly
after. A failure here would be very undesirable.
Note that the current behaviour of mainline with MAP_PRIVATE pages is
pretty bad. The following situation is allowed to occur today.
1. Process calls mmap(MAP_PRIVATE)
2. Process calls mlock() to fault all pages and makes sure it succeeds
3. Process forks()
4. Process writes to MAP_PRIVATE mapping while child still exists
5. If the COW fails at this point, the process gets SIGKILLed even though it
had taken care to ensure the pages existed
This patch improves the situation by guaranteeing the reliability of the
process that successfully calls mmap(). When the parent performs COW, it
will try to satisfy the allocation without using reserves. If that fails
the parent will steal the page leaving any children without a page.
Faults from the child after that point will result in failure. If the
child COW happens first, an attempt will be made to allocate the page
without reserves and the child will get SIGKILLed on failure.
To summarise the new behaviour:
1. If the original mapper performs COW on a private mapping with multiple
references, it will attempt to allocate a hugepage from the pool or
the buddy allocator without using the existing reserves. On fail, VMAs
mapping the same area are traversed and the page being COW'd is unmapped
where found. It will then steal the original page as the last mapper in
the normal way.
2. The VMAs the pages were unmapped from are flagged to note that pages
with data no longer exist. Future no-page faults on those VMAs will
terminate the process as otherwise it would appear that data was corrupted.
A warning is printed to the console that this situation occured.
2. If the child performs COW first, it will attempt to satisfy the COW
from the pool if there are enough pages or via the buddy allocator if
overcommit is allowed and the buddy allocator can satisfy the request. If
it fails, the child will be killed.
If the pool is large enough, existing applications will not notice that
the reserves were a factor. Existing applications depending on the
no-reserves been set are unlikely to exist as for much of the history of
hugetlbfs, pages were prefaulted at mmap(), allocating the pages at that
point or failing the mmap().
[npiggin@suse.de: fix CONFIG_HUGETLB=n build]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Adam Litke <agl@us.ibm.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-23 22:27:25 -06:00
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void unmap_hugepage_range(struct vm_area_struct *,
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unsigned long, unsigned long, struct page *);
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void __unmap_hugepage_range(struct vm_area_struct *,
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unsigned long, unsigned long, struct page *);
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2005-04-16 16:20:36 -06:00
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int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
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2008-10-15 13:50:22 -06:00
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void hugetlb_report_meminfo(struct seq_file *);
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2005-04-16 16:20:36 -06:00
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int hugetlb_report_node_meminfo(int, char *);
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unsigned long hugetlb_total_pages(void);
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2005-10-20 09:24:28 -06:00
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int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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2009-06-23 06:49:05 -06:00
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unsigned long address, unsigned int flags);
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2008-07-23 22:27:23 -06:00
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int hugetlb_reserve_pages(struct inode *inode, long from, long to,
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2009-02-10 07:02:27 -07:00
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struct vm_area_struct *vma,
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int acctflags);
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2006-06-23 03:03:15 -06:00
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void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
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2005-04-16 16:20:36 -06:00
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2007-07-17 05:03:13 -06:00
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extern unsigned long hugepages_treat_as_movable;
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2005-04-16 16:20:36 -06:00
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extern const unsigned long hugetlb_zero, hugetlb_infinity;
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extern int sysctl_hugetlb_shm_group;
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2008-07-23 22:27:52 -06:00
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extern struct list_head huge_boot_pages;
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2005-04-16 16:20:36 -06:00
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2005-06-21 18:14:44 -06:00
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/* arch callbacks */
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2008-07-23 22:27:41 -06:00
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pte_t *huge_pte_alloc(struct mm_struct *mm,
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unsigned long addr, unsigned long sz);
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2005-06-21 18:14:44 -06:00
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
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2006-12-06 21:32:03 -07:00
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int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
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2005-06-21 18:14:44 -06:00
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struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
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int write);
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd, int write);
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2008-07-23 22:27:50 -06:00
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struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
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pud_t *pud, int write);
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2005-06-21 18:14:44 -06:00
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int pmd_huge(pmd_t pmd);
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2008-07-23 22:27:50 -06:00
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int pud_huge(pud_t pmd);
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2006-03-22 01:08:50 -07:00
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void hugetlb_change_protection(struct vm_area_struct *vma,
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unsigned long address, unsigned long end, pgprot_t newprot);
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2005-06-21 18:14:44 -06:00
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2005-04-16 16:20:36 -06:00
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#else /* !CONFIG_HUGETLB_PAGE */
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mm: introduce PageHuge() for testing huge/gigantic pages
A series of patches to enhance the /proc/pagemap interface and to add a
userspace executable which can be used to present the pagemap data.
Export 10 more flags to end users (and more for kernel developers):
11. KPF_MMAP (pseudo flag) memory mapped page
12. KPF_ANON (pseudo flag) memory mapped page (anonymous)
13. KPF_SWAPCACHE page is in swap cache
14. KPF_SWAPBACKED page is swap/RAM backed
15. KPF_COMPOUND_HEAD (*)
16. KPF_COMPOUND_TAIL (*)
17. KPF_HUGE hugeTLB pages
18. KPF_UNEVICTABLE page is in the unevictable LRU list
19. KPF_HWPOISON hardware detected corruption
20. KPF_NOPAGE (pseudo flag) no page frame at the address
(*) For compound pages, exporting _both_ head/tail info enables
users to tell where a compound page starts/ends, and its order.
a simple demo of the page-types tool
# ./page-types -h
page-types [options]
-r|--raw Raw mode, for kernel developers
-a|--addr addr-spec Walk a range of pages
-b|--bits bits-spec Walk pages with specified bits
-l|--list Show page details in ranges
-L|--list-each Show page details one by one
-N|--no-summary Don't show summay info
-h|--help Show this usage message
addr-spec:
N one page at offset N (unit: pages)
N+M pages range from N to N+M-1
N,M pages range from N to M-1
N, pages range from N to end
,M pages range from 0 to M
bits-spec:
bit1,bit2 (flags & (bit1|bit2)) != 0
bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1
bit1,~bit2 (flags & (bit1|bit2)) == bit1
=bit1,bit2 flags == (bit1|bit2)
bit-names:
locked error referenced uptodate
dirty lru active slab
writeback reclaim buddy mmap
anonymous swapcache swapbacked compound_head
compound_tail huge unevictable hwpoison
nopage reserved(r) mlocked(r) mappedtodisk(r)
private(r) private_2(r) owner_private(r) arch(r)
uncached(r) readahead(o) slob_free(o) slub_frozen(o)
slub_debug(o)
(r) raw mode bits (o) overloaded bits
# ./page-types
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000000 487369 1903 _________________________________
0x0000000000000014 5 0 __R_D____________________________ referenced,dirty
0x0000000000000020 1 0 _____l___________________________ lru
0x0000000000000024 34 0 __R__l___________________________ referenced,lru
0x0000000000000028 3838 14 ___U_l___________________________ uptodate,lru
0x0001000000000028 48 0 ___U_l_______________________I___ uptodate,lru,readahead
0x000000000000002c 6478 25 __RU_l___________________________ referenced,uptodate,lru
0x000100000000002c 47 0 __RU_l_______________________I___ referenced,uptodate,lru,readahead
0x0000000000000040 8344 32 ______A__________________________ active
0x0000000000000060 1 0 _____lA__________________________ lru,active
0x0000000000000068 348 1 ___U_lA__________________________ uptodate,lru,active
0x0001000000000068 12 0 ___U_lA______________________I___ uptodate,lru,active,readahead
0x000000000000006c 988 3 __RU_lA__________________________ referenced,uptodate,lru,active
0x000100000000006c 48 0 __RU_lA______________________I___ referenced,uptodate,lru,active,readahead
0x0000000000004078 1 0 ___UDlA_______b__________________ uptodate,dirty,lru,active,swapbacked
0x000000000000407c 34 0 __RUDlA_______b__________________ referenced,uptodate,dirty,lru,active,swapbacked
0x0000000000000400 503 1 __________B______________________ buddy
0x0000000000000804 1 0 __R________M_____________________ referenced,mmap
0x0000000000000828 1029 4 ___U_l_____M_____________________ uptodate,lru,mmap
0x0001000000000828 43 0 ___U_l_____M_________________I___ uptodate,lru,mmap,readahead
0x000000000000082c 382 1 __RU_l_____M_____________________ referenced,uptodate,lru,mmap
0x000100000000082c 12 0 __RU_l_____M_________________I___ referenced,uptodate,lru,mmap,readahead
0x0000000000000868 192 0 ___U_lA____M_____________________ uptodate,lru,active,mmap
0x0001000000000868 12 0 ___U_lA____M_________________I___ uptodate,lru,active,mmap,readahead
0x000000000000086c 800 3 __RU_lA____M_____________________ referenced,uptodate,lru,active,mmap
0x000100000000086c 31 0 __RU_lA____M_________________I___ referenced,uptodate,lru,active,mmap,readahead
0x0000000000004878 2 0 ___UDlA____M__b__________________ uptodate,dirty,lru,active,mmap,swapbacked
0x0000000000001000 492 1 ____________a____________________ anonymous
0x0000000000005808 4 0 ___U_______Ma_b__________________ uptodate,mmap,anonymous,swapbacked
0x0000000000005868 2839 11 ___U_lA____Ma_b__________________ uptodate,lru,active,mmap,anonymous,swapbacked
0x000000000000586c 30 0 __RU_lA____Ma_b__________________ referenced,uptodate,lru,active,mmap,anonymous,swapbacked
total 513968 2007
# ./page-types -r
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000000 468002 1828 _________________________________
0x0000000100000000 19102 74 _____________________r___________ reserved
0x0000000000008000 41 0 _______________H_________________ compound_head
0x0000000000010000 188 0 ________________T________________ compound_tail
0x0000000000008014 1 0 __R_D__________H_________________ referenced,dirty,compound_head
0x0000000000010014 4 0 __R_D___________T________________ referenced,dirty,compound_tail
0x0000000000000020 1 0 _____l___________________________ lru
0x0000000800000024 34 0 __R__l__________________P________ referenced,lru,private
0x0000000000000028 3794 14 ___U_l___________________________ uptodate,lru
0x0001000000000028 46 0 ___U_l_______________________I___ uptodate,lru,readahead
0x0000000400000028 44 0 ___U_l_________________d_________ uptodate,lru,mappedtodisk
0x0001000400000028 2 0 ___U_l_________________d_____I___ uptodate,lru,mappedtodisk,readahead
0x000000000000002c 6434 25 __RU_l___________________________ referenced,uptodate,lru
0x000100000000002c 47 0 __RU_l_______________________I___ referenced,uptodate,lru,readahead
0x000000040000002c 14 0 __RU_l_________________d_________ referenced,uptodate,lru,mappedtodisk
0x000000080000002c 30 0 __RU_l__________________P________ referenced,uptodate,lru,private
0x0000000800000040 8124 31 ______A_________________P________ active,private
0x0000000000000040 219 0 ______A__________________________ active
0x0000000800000060 1 0 _____lA_________________P________ lru,active,private
0x0000000000000068 322 1 ___U_lA__________________________ uptodate,lru,active
0x0001000000000068 12 0 ___U_lA______________________I___ uptodate,lru,active,readahead
0x0000000400000068 13 0 ___U_lA________________d_________ uptodate,lru,active,mappedtodisk
0x0000000800000068 12 0 ___U_lA_________________P________ uptodate,lru,active,private
0x000000000000006c 977 3 __RU_lA__________________________ referenced,uptodate,lru,active
0x000100000000006c 48 0 __RU_lA______________________I___ referenced,uptodate,lru,active,readahead
0x000000040000006c 5 0 __RU_lA________________d_________ referenced,uptodate,lru,active,mappedtodisk
0x000000080000006c 3 0 __RU_lA_________________P________ referenced,uptodate,lru,active,private
0x0000000c0000006c 3 0 __RU_lA________________dP________ referenced,uptodate,lru,active,mappedtodisk,private
0x0000000c00000068 1 0 ___U_lA________________dP________ uptodate,lru,active,mappedtodisk,private
0x0000000000004078 1 0 ___UDlA_______b__________________ uptodate,dirty,lru,active,swapbacked
0x000000000000407c 34 0 __RUDlA_______b__________________ referenced,uptodate,dirty,lru,active,swapbacked
0x0000000000000400 538 2 __________B______________________ buddy
0x0000000000000804 1 0 __R________M_____________________ referenced,mmap
0x0000000000000828 1029 4 ___U_l_____M_____________________ uptodate,lru,mmap
0x0001000000000828 43 0 ___U_l_____M_________________I___ uptodate,lru,mmap,readahead
0x000000000000082c 382 1 __RU_l_____M_____________________ referenced,uptodate,lru,mmap
0x000100000000082c 12 0 __RU_l_____M_________________I___ referenced,uptodate,lru,mmap,readahead
0x0000000000000868 192 0 ___U_lA____M_____________________ uptodate,lru,active,mmap
0x0001000000000868 12 0 ___U_lA____M_________________I___ uptodate,lru,active,mmap,readahead
0x000000000000086c 800 3 __RU_lA____M_____________________ referenced,uptodate,lru,active,mmap
0x000100000000086c 31 0 __RU_lA____M_________________I___ referenced,uptodate,lru,active,mmap,readahead
0x0000000000004878 2 0 ___UDlA____M__b__________________ uptodate,dirty,lru,active,mmap,swapbacked
0x0000000000001000 492 1 ____________a____________________ anonymous
0x0000000000005008 2 0 ___U________a_b__________________ uptodate,anonymous,swapbacked
0x0000000000005808 4 0 ___U_______Ma_b__________________ uptodate,mmap,anonymous,swapbacked
0x000000000000580c 1 0 __RU_______Ma_b__________________ referenced,uptodate,mmap,anonymous,swapbacked
0x0000000000005868 2839 11 ___U_lA____Ma_b__________________ uptodate,lru,active,mmap,anonymous,swapbacked
0x000000000000586c 29 0 __RU_lA____Ma_b__________________ referenced,uptodate,lru,active,mmap,anonymous,swapbacked
total 513968 2007
# ./page-types --raw --list --no-summary --bits reserved
offset count flags
0 15 _____________________r___________
31 4 _____________________r___________
159 97 _____________________r___________
4096 2067 _____________________r___________
6752 2390 _____________________r___________
9355 3 _____________________r___________
9728 14526 _____________________r___________
This patch:
Introduce PageHuge(), which identifies huge/gigantic pages by their
dedicated compound destructor functions.
Also move prep_compound_gigantic_page() to hugetlb.c and make
__free_pages_ok() non-static.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16 16:32:22 -06:00
|
|
|
static inline int PageHuge(struct page *page)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
2008-07-23 22:27:23 -06:00
|
|
|
|
|
|
|
|
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
|
|
|
|
|
{
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
static inline unsigned long hugetlb_total_pages(void)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2007-11-14 17:59:33 -07:00
|
|
|
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
|
2005-04-16 16:20:36 -06:00
|
|
|
#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
|
|
|
|
|
#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
|
|
|
|
|
#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
|
hugetlb: guarantee that COW faults for a process that called mmap(MAP_PRIVATE) on hugetlbfs will succeed
After patch 2 in this series, a process that successfully calls mmap() for
a MAP_PRIVATE mapping will be guaranteed to successfully fault until a
process calls fork(). At that point, the next write fault from the parent
could fail due to COW if the child still has a reference.
We only reserve pages for the parent but a copy must be made to avoid
leaking data from the parent to the child after fork(). Reserves could be
taken for both parent and child at fork time to guarantee faults but if
the mapping is large it is highly likely we will not have sufficient pages
for the reservation, and it is common to fork only to exec() immediatly
after. A failure here would be very undesirable.
Note that the current behaviour of mainline with MAP_PRIVATE pages is
pretty bad. The following situation is allowed to occur today.
1. Process calls mmap(MAP_PRIVATE)
2. Process calls mlock() to fault all pages and makes sure it succeeds
3. Process forks()
4. Process writes to MAP_PRIVATE mapping while child still exists
5. If the COW fails at this point, the process gets SIGKILLed even though it
had taken care to ensure the pages existed
This patch improves the situation by guaranteeing the reliability of the
process that successfully calls mmap(). When the parent performs COW, it
will try to satisfy the allocation without using reserves. If that fails
the parent will steal the page leaving any children without a page.
Faults from the child after that point will result in failure. If the
child COW happens first, an attempt will be made to allocate the page
without reserves and the child will get SIGKILLed on failure.
To summarise the new behaviour:
1. If the original mapper performs COW on a private mapping with multiple
references, it will attempt to allocate a hugepage from the pool or
the buddy allocator without using the existing reserves. On fail, VMAs
mapping the same area are traversed and the page being COW'd is unmapped
where found. It will then steal the original page as the last mapper in
the normal way.
2. The VMAs the pages were unmapped from are flagged to note that pages
with data no longer exist. Future no-page faults on those VMAs will
terminate the process as otherwise it would appear that data was corrupted.
A warning is printed to the console that this situation occured.
2. If the child performs COW first, it will attempt to satisfy the COW
from the pool if there are enough pages or via the buddy allocator if
overcommit is allowed and the buddy allocator can satisfy the request. If
it fails, the child will be killed.
If the pool is large enough, existing applications will not notice that
the reserves were a factor. Existing applications depending on the
no-reserves been set are unlikely to exist as for much of the history of
hugetlbfs, pages were prefaulted at mmap(), allocating the pages at that
point or failing the mmap().
[npiggin@suse.de: fix CONFIG_HUGETLB=n build]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Adam Litke <agl@us.ibm.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-23 22:27:25 -06:00
|
|
|
#define unmap_hugepage_range(vma, start, end, page) BUG()
|
2008-10-15 13:50:22 -06:00
|
|
|
static inline void hugetlb_report_meminfo(struct seq_file *m)
|
|
|
|
|
{
|
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
#define hugetlb_report_node_meminfo(n, buf) 0
|
|
|
|
|
#define follow_huge_pmd(mm, addr, pmd, write) NULL
|
2008-07-23 22:27:50 -06:00
|
|
|
#define follow_huge_pud(mm, addr, pud, write) NULL
|
2008-07-23 22:27:41 -06:00
|
|
|
#define prepare_hugepage_range(file, addr, len) (-EINVAL)
|
2005-04-16 16:20:36 -06:00
|
|
|
#define pmd_huge(x) 0
|
2008-07-23 22:27:50 -06:00
|
|
|
#define pud_huge(x) 0
|
2005-04-16 16:20:36 -06:00
|
|
|
#define is_hugepage_only_range(mm, addr, len) 0
|
[PATCH] hugepage: Fix hugepage logic in free_pgtables()
free_pgtables() has special logic to call hugetlb_free_pgd_range() instead
of the normal free_pgd_range() on hugepage VMAs. However, the test it uses
to do so is incorrect: it calls is_hugepage_only_range on a hugepage sized
range at the start of the vma. is_hugepage_only_range() will return true
if the given range has any intersection with a hugepage address region, and
in this case the given region need not be hugepage aligned. So, for
example, this test can return true if called on, say, a 4k VMA immediately
preceding a (nicely aligned) hugepage VMA.
At present we get away with this because the powerpc version of
hugetlb_free_pgd_range() is just a call to free_pgd_range(). On ia64 (the
only other arch with a non-trivial is_hugepage_only_range()) we get away
with it for a different reason; the hugepage area is not contiguous with
the rest of the user address space, and VMAs are not permitted in between,
so the test can't return a false positive there.
Nonetheless this should be fixed. We do that in the patch below by
replacing the is_hugepage_only_range() test with an explicit test of the
VMA using is_vm_hugetlb_page().
This in turn changes behaviour for platforms where is_hugepage_only_range()
returns false always (everything except powerpc and ia64). We address this
by ensuring that hugetlb_free_pgd_range() is defined to be identical to
free_pgd_range() (instead of a no-op) on everything except ia64. Even so,
it will prevent some otherwise possible coalescing of calls down to
free_pgd_range(). Since this only happens for hugepage VMAs, removing this
small optimization seems unlikely to cause any trouble.
This patch causes no regressions on the libhugetlbfs testsuite - ppc64
POWER5 (8-way), ppc64 G5 (2-way) and i386 Pentium M (UP).
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Cc: William Lee Irwin III <wli@holomorphy.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-22 01:08:57 -07:00
|
|
|
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
|
2009-06-23 06:49:05 -06:00
|
|
|
#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-03-22 01:08:50 -07:00
|
|
|
#define hugetlb_change_protection(vma, address, end, newprot)
|
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
#ifndef HPAGE_MASK
|
2005-11-13 17:06:42 -07:00
|
|
|
#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
|
|
|
|
|
#define HPAGE_SIZE PAGE_SIZE
|
2005-04-16 16:20:36 -06:00
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#endif /* !CONFIG_HUGETLB_PAGE */
|
|
|
|
|
|
2009-09-21 18:03:47 -06:00
|
|
|
#define HUGETLB_ANON_FILE "anon_hugepage"
|
|
|
|
|
|
2009-09-21 18:03:43 -06:00
|
|
|
enum {
|
|
|
|
|
/*
|
|
|
|
|
* The file will be used as an shm file so shmfs accounting rules
|
|
|
|
|
* apply
|
|
|
|
|
*/
|
|
|
|
|
HUGETLB_SHMFS_INODE = 1,
|
2009-09-21 18:03:47 -06:00
|
|
|
/*
|
|
|
|
|
* The file is being created on the internal vfs mount and shmfs
|
|
|
|
|
* accounting rules do not apply
|
|
|
|
|
*/
|
|
|
|
|
HUGETLB_ANONHUGE_INODE = 2,
|
2009-09-21 18:03:43 -06:00
|
|
|
};
|
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
#ifdef CONFIG_HUGETLBFS
|
|
|
|
|
struct hugetlbfs_config {
|
|
|
|
|
uid_t uid;
|
|
|
|
|
gid_t gid;
|
|
|
|
|
umode_t mode;
|
|
|
|
|
long nr_blocks;
|
|
|
|
|
long nr_inodes;
|
2008-07-23 22:27:43 -06:00
|
|
|
struct hstate *hstate;
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
struct hugetlbfs_sb_info {
|
|
|
|
|
long max_blocks; /* blocks allowed */
|
|
|
|
|
long free_blocks; /* blocks free */
|
|
|
|
|
long max_inodes; /* inodes allowed */
|
|
|
|
|
long free_inodes; /* inodes free */
|
|
|
|
|
spinlock_t stat_lock;
|
2008-07-23 22:27:43 -06:00
|
|
|
struct hstate *hstate;
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
struct hugetlbfs_inode_info {
|
|
|
|
|
struct shared_policy policy;
|
|
|
|
|
struct inode vfs_inode;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
|
|
|
|
|
{
|
|
|
|
|
return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
|
|
|
|
|
{
|
|
|
|
|
return sb->s_fs_info;
|
|
|
|
|
}
|
|
|
|
|
|
2006-03-28 02:56:42 -07:00
|
|
|
extern const struct file_operations hugetlbfs_file_operations;
|
2005-04-16 16:20:36 -06:00
|
|
|
extern struct vm_operations_struct hugetlb_vm_ops;
|
2009-08-24 09:30:28 -06:00
|
|
|
struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
|
2009-09-21 18:03:43 -06:00
|
|
|
struct user_struct **user, int creat_flags);
|
2007-11-14 17:59:41 -07:00
|
|
|
int hugetlb_get_quota(struct address_space *mapping, long delta);
|
|
|
|
|
void hugetlb_put_quota(struct address_space *mapping, long delta);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
static inline int is_file_hugepages(struct file *file)
|
|
|
|
|
{
|
2007-03-01 16:46:08 -07:00
|
|
|
if (file->f_op == &hugetlbfs_file_operations)
|
|
|
|
|
return 1;
|
|
|
|
|
if (is_file_shm_hugepages(file))
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline void set_file_hugepages(struct file *file)
|
|
|
|
|
{
|
|
|
|
|
file->f_op = &hugetlbfs_file_operations;
|
|
|
|
|
}
|
|
|
|
|
#else /* !CONFIG_HUGETLBFS */
|
|
|
|
|
|
2009-02-10 15:27:32 -07:00
|
|
|
#define is_file_hugepages(file) 0
|
|
|
|
|
#define set_file_hugepages(file) BUG()
|
2009-09-24 15:47:45 -06:00
|
|
|
static inline struct file *hugetlb_file_setup(const char *name, size_t size,
|
|
|
|
|
int acctflag, struct user_struct **user, int creat_flags)
|
|
|
|
|
{
|
|
|
|
|
return ERR_PTR(-ENOSYS);
|
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
#endif /* !CONFIG_HUGETLBFS */
|
|
|
|
|
|
2007-05-06 15:49:00 -06:00
|
|
|
#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
|
|
|
|
|
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
|
|
|
|
|
unsigned long len, unsigned long pgoff,
|
|
|
|
|
unsigned long flags);
|
|
|
|
|
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
|
|
|
|
|
|
2008-07-23 22:27:41 -06:00
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
|
|
|
|
2008-07-23 22:27:44 -06:00
|
|
|
#define HSTATE_NAME_LEN 32
|
2008-07-23 22:27:41 -06:00
|
|
|
/* Defines one hugetlb page size */
|
|
|
|
|
struct hstate {
|
2009-09-21 18:01:22 -06:00
|
|
|
int next_nid_to_alloc;
|
|
|
|
|
int next_nid_to_free;
|
2008-07-23 22:27:41 -06:00
|
|
|
unsigned int order;
|
|
|
|
|
unsigned long mask;
|
|
|
|
|
unsigned long max_huge_pages;
|
|
|
|
|
unsigned long nr_huge_pages;
|
|
|
|
|
unsigned long free_huge_pages;
|
|
|
|
|
unsigned long resv_huge_pages;
|
|
|
|
|
unsigned long surplus_huge_pages;
|
|
|
|
|
unsigned long nr_overcommit_huge_pages;
|
|
|
|
|
struct list_head hugepage_freelists[MAX_NUMNODES];
|
|
|
|
|
unsigned int nr_huge_pages_node[MAX_NUMNODES];
|
|
|
|
|
unsigned int free_huge_pages_node[MAX_NUMNODES];
|
|
|
|
|
unsigned int surplus_huge_pages_node[MAX_NUMNODES];
|
2008-07-23 22:27:44 -06:00
|
|
|
char name[HSTATE_NAME_LEN];
|
2008-07-23 22:27:41 -06:00
|
|
|
};
|
|
|
|
|
|
2008-07-23 22:27:52 -06:00
|
|
|
struct huge_bootmem_page {
|
|
|
|
|
struct list_head list;
|
|
|
|
|
struct hstate *hstate;
|
|
|
|
|
};
|
|
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/* arch callback */
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int __init alloc_bootmem_huge_page(struct hstate *h);
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2008-07-23 22:27:42 -06:00
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void __init hugetlb_add_hstate(unsigned order);
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struct hstate *size_to_hstate(unsigned long size);
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#ifndef HUGE_MAX_HSTATE
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#define HUGE_MAX_HSTATE 1
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#endif
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extern struct hstate hstates[HUGE_MAX_HSTATE];
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extern unsigned int default_hstate_idx;
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#define default_hstate (hstates[default_hstate_idx])
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2008-07-23 22:27:41 -06:00
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2008-07-23 22:27:43 -06:00
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static inline struct hstate *hstate_inode(struct inode *i)
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2008-07-23 22:27:41 -06:00
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{
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2008-07-23 22:27:43 -06:00
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struct hugetlbfs_sb_info *hsb;
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hsb = HUGETLBFS_SB(i->i_sb);
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return hsb->hstate;
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2008-07-23 22:27:41 -06:00
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}
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static inline struct hstate *hstate_file(struct file *f)
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{
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2008-07-23 22:27:43 -06:00
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return hstate_inode(f->f_dentry->d_inode);
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2008-07-23 22:27:41 -06:00
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}
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2008-07-23 22:27:43 -06:00
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static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
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2008-07-23 22:27:41 -06:00
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{
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2008-07-23 22:27:43 -06:00
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return hstate_file(vma->vm_file);
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2008-07-23 22:27:41 -06:00
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}
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static inline unsigned long huge_page_size(struct hstate *h)
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{
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return (unsigned long)PAGE_SIZE << h->order;
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}
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2009-01-06 15:38:53 -07:00
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extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
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2009-01-06 15:38:54 -07:00
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extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
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2008-07-23 22:27:41 -06:00
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static inline unsigned long huge_page_mask(struct hstate *h)
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{
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return h->mask;
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}
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static inline unsigned int huge_page_order(struct hstate *h)
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{
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return h->order;
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}
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static inline unsigned huge_page_shift(struct hstate *h)
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{
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return h->order + PAGE_SHIFT;
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}
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static inline unsigned int pages_per_huge_page(struct hstate *h)
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{
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return 1 << h->order;
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}
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static inline unsigned int blocks_per_huge_page(struct hstate *h)
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{
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return huge_page_size(h) / 512;
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}
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#include <asm/hugetlb.h>
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2008-07-23 22:27:42 -06:00
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static inline struct hstate *page_hstate(struct page *page)
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{
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return size_to_hstate(PAGE_SIZE << compound_order(page));
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}
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2008-07-23 22:27:41 -06:00
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#else
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struct hstate {};
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2008-07-23 22:27:52 -06:00
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#define alloc_bootmem_huge_page(h) NULL
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2008-07-23 22:27:41 -06:00
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#define hstate_file(f) NULL
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#define hstate_vma(v) NULL
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#define hstate_inode(i) NULL
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#define huge_page_size(h) PAGE_SIZE
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#define huge_page_mask(h) PAGE_MASK
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2009-01-06 15:38:53 -07:00
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#define vma_kernel_pagesize(v) PAGE_SIZE
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2009-01-06 15:38:54 -07:00
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#define vma_mmu_pagesize(v) PAGE_SIZE
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2008-07-23 22:27:41 -06:00
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#define huge_page_order(h) 0
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#define huge_page_shift(h) PAGE_SHIFT
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2008-07-26 16:22:27 -06:00
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static inline unsigned int pages_per_huge_page(struct hstate *h)
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{
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return 1;
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}
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2008-07-23 22:27:41 -06:00
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#endif
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2005-04-16 16:20:36 -06:00
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#endif /* _LINUX_HUGETLB_H */
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