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Vladimir Davydov 1d7715c676 mmu-notifier: add clear_young callback 
In the scope of the idle memory tracking feature, which is introduced by
the following patch, we need to clear the referenced/accessed bit not only
in primary, but also in secondary ptes.  The latter is required in order
to estimate wss of KVM VMs.  At the same time we want to avoid flushing
tlb, because it is quite expensive and it won't really affect the final
result.

Currently, there is no function for clearing pte young bit that would meet
our requirements, so this patch introduces one.  To achieve that we have
to add a new mmu-notifier callback, clear_young, since there is no method
for testing-and-clearing a secondary pte w/o flushing tlb.  The new method
is not mandatory and currently only implemented by KVM.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Reviewed-by: Andres Lagar-Cavilla <andreslc@google.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Greg Thelen <gthelen@google.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-09-10 13:29:01 -07:00
..
kasan x86/kasan, mm: Introduce generic kasan_populate_zero_shadow() 2015-08-22 14:54:55 +02:00
backing-dev.c inode: rename i_wb_list to i_io_list 2015-08-17 23:38:10 -04:00
balloon_compaction.c
bootmem.c bootmem: avoid freeing to bootmem after bootmem is done 2015-09-08 15:35:28 -07:00
cleancache.c cleancache: remove limit on the number of cleancache enabled filesystems 2015-04-14 16:49:03 -07:00
cma.c mm/memblock: add extra "flags" to memblock to allow selection of memory based on attribute 2015-06-24 17:49:44 -07:00
cma.h mm: cma: mark cma_bitmap_maxno() inline in header 2015-08-14 15:56:32 -07:00
cma_debug.c mm/cma_debug: correct size input to bitmap function 2015-07-17 16:39:54 -07:00
compaction.c mm/compaction: correct to flush migrated pages if pageblock skip happens 2015-09-08 15:35:28 -07:00
debug-pagealloc.c
debug.c tracing: Rename ftrace_event.h to trace_events.h 2015-05-13 14:05:12 -04:00
dmapool.c mm: add support for __GFP_ZERO flag to dma_pool_alloc() 2015-09-08 15:35:28 -07:00
early_ioremap.c Merge branch 'akpm' (patches from Andrew) 2015-09-08 17:52:23 -07:00
fadvise.c writeback: implement and use inode_congested() 2015-06-02 08:33:35 -06:00
failslab.c
filemap.c mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
frontswap.c frontswap: allow multiple backends 2015-06-24 17:49:45 -07:00
gup.c mm: make GUP handle pfn mapping unless FOLL_GET is requested 2015-09-04 16:54:41 -07:00
highmem.c
huge_memory.c mm/khugepaged: allow interruption of allocation sleep again 2015-09-08 15:35:28 -07:00
hugetlb.c mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
hugetlb_cgroup.c
hwpoison-inject.c hwpoison: use page_cgroup_ino for filtering by memcg 2015-09-10 13:29:01 -07:00
init-mm.c
internal.h mm/compaction: correct to flush migrated pages if pageblock skip happens 2015-09-08 15:35:28 -07:00
interval_tree.c
Kconfig libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c kmemleak: record accurate early log buffer count and report when exceeded 2015-09-08 15:35:28 -07:00
ksm.c mm: remove rest of ACCESS_ONCE() usages 2015-04-15 16:35:18 -07:00
list_lru.c list_lru: don't call list_lru_from_kmem if the list_head is empty 2015-09-08 15:35:28 -07:00
maccess.c lib: move strncpy_from_unsafe() into mm/maccess.c 2015-08-31 12:36:10 -07:00
madvise.c mm: madvise allow remove operation for hugetlbfs 2015-09-08 15:35:28 -07:00
Makefile userfaultfd: mcopy_atomic|mfill_zeropage: UFFDIO_COPY|UFFDIO_ZEROPAGE preparation 2015-09-04 16:54:41 -07:00
memblock.c mm/memblock.c: fix comment in __next_mem_range() 2015-09-08 15:35:28 -07:00
memcontrol.c memcg: zap try_get_mem_cgroup_from_page 2015-09-10 13:29:01 -07:00
memory-failure.c hwpoison: use page_cgroup_ino for filtering by memcg 2015-09-10 13:29:01 -07:00
memory.c mm, dax: use i_mmap_unlock_write() in do_cow_fault() 2015-09-08 15:35:28 -07:00
memory_hotplug.c libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
mempolicy.c mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
mempool.c mm/mempool: allow NULL `pool' pointer in mempool_destroy() 2015-09-08 15:35:28 -07:00
memtest.c memtest: remove unused header files 2015-09-08 15:35:28 -07:00
migrate.c mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
mincore.c
mlock.c userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx 2015-09-04 16:54:41 -07:00
mm_init.c mm: meminit: remove mminit_verify_page_links 2015-06-30 19:44:56 -07:00
mmap.c mm/mmap.c:insert_vm_struct(): check for failure before setting values 2015-09-08 15:35:28 -07:00
mmu_context.c
mmu_notifier.c mmu-notifier: add clear_young callback 2015-09-10 13:29:01 -07:00
mmzone.c
mprotect.c userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx 2015-09-04 16:54:41 -07:00
mremap.c mremap: simplify the "overlap" check in mremap_to() 2015-09-04 16:54:41 -07:00
msync.c
nobootmem.c mm: page_alloc: pass PFN to __free_pages_bootmem 2015-06-30 19:44:55 -07:00
nommu.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-09-01 18:46:42 -07:00
oom_kill.c mm, oom: remove unnecessary variable 2015-09-08 15:35:28 -07:00
page-writeback.c writeback: fix initial dirty limit 2015-08-07 04:39:42 +03:00
page_alloc.c Merge branch 'akpm' (patches from Andrew) 2015-09-08 17:52:23 -07:00
page_counter.c
page_ext.c
page_io.c fs: use helper bio_add_page() instead of open coding on bi_io_vec 2015-08-13 12:32:00 -06:00
page_isolation.c mm, page_isolation: make set/unset_migratetype_isolate() file-local 2015-09-08 15:35:28 -07:00
page_owner.c mm/page_owner: set correct gfp_mask on page_owner 2015-07-17 16:39:54 -07:00
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c percpu: clean up of schunk->map[] assignment in pcpu_setup_first_chunk 2015-07-21 11:31:00 -04:00
pgtable-generic.c mm: clarify that the function operates on hugepage pte 2015-06-24 17:49:44 -07:00
process_vm_access.c
quicklist.c
readahead.c writeback: implement and use inode_congested() 2015-06-02 08:33:35 -06:00
rmap.c mm: defer flush of writable TLB entries 2015-09-04 16:54:41 -07:00
shmem.c shmem: recalculate file inode when fstat 2015-09-08 15:35:28 -07:00
slab.c mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
slab.h mm/slab.h: fix argument order in cache_from_obj's error message 2015-09-04 16:54:41 -07:00
slab_common.c memcg: export struct mem_cgroup 2015-09-08 15:35:28 -07:00
slob.c mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
slub.c mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
sparse-vmemmap.c
sparse.c
swap.c mm: drop bogus VM_BUG_ON_PAGE assert in put_page() codepath 2015-06-24 17:49:42 -07:00
swap_cgroup.c
swap_state.c mm: swap: zswap: maybe_preload & refactoring 2015-09-08 15:35:28 -07:00
swapfile.c mm: /proc/pid/smaps:: show proportional swap share of the mapping 2015-09-08 15:35:28 -07:00
truncate.c memcg: add per cgroup dirty page accounting 2015-06-02 08:33:33 -06:00
userfaultfd.c userfaultfd: avoid mmap_sem read recursion in mcopy_atomic 2015-09-04 16:54:41 -07:00
util.c mm: uninline and cleanup page-mapping related helpers 2015-04-15 16:35:19 -07:00
vmacache.c
vmalloc.c mm/vmalloc: get rid of dirty bitmap inside vmap_block structure 2015-04-15 16:35:18 -07:00
vmpressure.c
vmscan.c mm, vmscan: unlock page while waiting on writeback 2015-09-08 15:35:28 -07:00
vmstat.c
workingset.c
zbud.c mm: zbud: constify the zbud_ops 2015-09-08 15:35:28 -07:00
zpool.c zpool: add zpool_has_pool() 2015-09-10 13:29:01 -07:00
zsmalloc.c mm: zpool: constify the zpool_ops 2015-09-08 15:35:28 -07:00
zswap.c zswap: change zpool/compressor at runtime 2015-09-10 13:29:01 -07:00