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Subject: [PATCH] hugetlb: vmstat events for huge page allocations

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Allocating huge pages directly from the buddy allocator is not guaranteed to
succeed.  Success depends on several factors (such as the amount of physical
memory available and the level of fragmentation).  With the addition of
dynamic hugetlb pool resizing, allocations can occur much more frequently.
For these reasons it is desirable to keep track of huge page allocation
successes and failures.

Add two new vmstat entries to track huge page allocations that succeed and
fail.  The presence of the two entries is contingent upon CONFIG_HUGETLB_PAGE
being enabled.

[akpm@linux-foundation.org: reduced ifdeffery]
Signed-off-by: Adam Litke <agl@us.ibm.com>
Signed-off-by: Eric Munson <ebmunson@us.ibm.com>
Tested-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Andy Whitcroft <apw@shadowen.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Adam Litke 2008-04-28 02:13:06 -07:00 committed by Linus Torvalds
parent 122c7a5905
commit 3b11630063
3 changed files with 15 additions and 0 deletions
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4
include/linux/vmstat.h
View file

@ -25,6 +25,7 @@
#define HIGHMEM_ZONE(xx)
#endif
#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE
enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
@ -37,6 +38,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
FOR_ALL_ZONES(PGSCAN_DIRECT),
PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL,
PAGEOUTRUN, ALLOCSTALL, PGROTATED,
#ifdef CONFIG_HUGETLB_PAGE
HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
#endif
NR_VM_EVENT_ITEMS
};

7
mm/hugetlb.c
View file

@ -242,6 +242,11 @@ static int alloc_fresh_huge_page(void)
hugetlb_next_nid = next_nid;
} while (!page && hugetlb_next_nid != start_nid);
if (ret)
count_vm_event(HTLB_BUDDY_PGALLOC);
else
count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
return ret;
}
@ -302,9 +307,11 @@ static struct page *alloc_buddy_huge_page(struct vm_area_struct *vma,
*/
nr_huge_pages_node[nid]++;
surplus_huge_pages_node[nid]++;
__count_vm_event(HTLB_BUDDY_PGALLOC);
} else {
nr_huge_pages--;
surplus_huge_pages--;
__count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
}
spin_unlock(&hugetlb_lock);

4
mm/vmstat.c
View file

@ -645,6 +645,10 @@ static const char * const vmstat_text[] = {
"allocstall",
"pgrotated",
#ifdef CONFIG_HUGETLB_PAGE
"htlb_buddy_alloc_success",
"htlb_buddy_alloc_fail",
#endif
#endif
};