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| author | David Rientjes <rientjes@google.com> | 2012-10-08 23:34:06 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 07:23:03 (GMT) |
| commit | 8449d21fb49e9824e2736c5febd6b5d287cd2ba1 (patch) | |
| tree | 8685691f2e75ab7ceeacb05c661fa151270c3ee8 /mm/rmap.c | |
| parent | b676b293fb48672904ee1b9828cb50b4eed01717 (diff) | |
| download | linux-fsl-qoriq-8449d21fb49e9824e2736c5febd6b5d287cd2ba1.tar.xz | |
mm, thp: fix mlock statistics
NR_MLOCK is only accounted in single page units: there's no logic to
handle transparent hugepages. This patch checks the appropriate number of
pages to adjust the statistics by so that the correct amount of memory is
reflected.
Currently:
$ grep Mlocked /proc/meminfo
Mlocked: 19636 kB
#define MAP_SIZE (4 << 30) /* 4GB */
void *ptr = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
mlock(ptr, MAP_SIZE);
$ grep Mlocked /proc/meminfo
Mlocked: 29844 kB
munlock(ptr, MAP_SIZE);
$ grep Mlocked /proc/meminfo
Mlocked: 19636 kB
And with this patch:
$ grep Mlock /proc/meminfo
Mlocked: 19636 kB
mlock(ptr, MAP_SIZE);
$ grep Mlock /proc/meminfo
Mlocked: 4213664 kB
munlock(ptr, MAP_SIZE);
$ grep Mlock /proc/meminfo
Mlocked: 19636 kB
Signed-off-by: David Rientjes <rientjes@google.com>
Reported-by: Hugh Dickens <hughd@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
0 files changed, 0 insertions, 0 deletions