diff options
| author | Shaohua Li <[email protected]> | 2011-05-24 17:11:20 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2011-05-25 08:39:04 -0700 |
| commit | 965f55dea0e331152fa53941a51e4e16f9f06fae (patch) | |
| tree | 3cf8beb31bac7b325b62e8ef75618e0086a3c760 /tools/perf/scripts/python/failed-syscalls-by-pid.py | |
| parent | 5f70b962ccc2f2e6259417cf3d1233dc9e16cf5e (diff) | |
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 <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/failed-syscalls-by-pid.py')
0 files changed, 0 insertions, 0 deletions