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| author |   Shaohua Li <shaohua.li@intel.com> | 2011-05-24 17:11:20 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:04 -0700 |
| commit | 965f55dea0e331152fa53941a51e4e16f9f06fae (patch) | |
| tree | 3cf8beb31bac7b325b62e8ef75618e0086a3c760 /mm/page_alloc.c | |
| parent | mmap: avoid unnecessary anon_vma lock (diff) | |
| download | linux-dev-965f55dea0e331152fa53941a51e4e16f9f06fae.tar.xz linux-dev-965f55dea0e331152fa53941a51e4e16f9f06fae.zip | |
mmap: avoid merging cloned VMAs
Avoid merging a VMA with another VMA which is cloned from the parent process.
The cloned VMA shares the anon_vma lock with the parent process's VMA. If
we do the merge, more vmas (even the new range is only for current
process) use the perent process's anon_vma lock. This introduces
scalability issues. find_mergeable_anon_vma() already considers this
case.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
0 files changed, 0 insertions, 0 deletions