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| author | Johannes Weiner <hannes@cmpxchg.org> | 2012-01-12 17:18:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-12 20:13:06 -0800 |
| commit | 00c54c0bac24bb02d2460c516da76651a7451286 (patch) | |
| tree | d88356ab217fa4c119a6c11dd7f614413adc020a /kernel/sysctl_check.c | |
| parent | cfa449461e67b60df986170eecb089831fa9e49a (diff) | |
| download | blackbird-op-linux-00c54c0bac24bb02d2460c516da76651a7451286.tar.gz blackbird-op-linux-00c54c0bac24bb02d2460c516da76651a7451286.zip | |
mm: page_cgroup: check page_cgroup arrays in lookup_page_cgroup() only when necessary
lookup_page_cgroup() is usually used only against pages that are used in
userspace.
The exception is the CONFIG_DEBUG_VM-only memcg check from the page
allocator: it can run on pages without page_cgroup descriptors allocated
when the pages are fed into the page allocator for the first time during
boot or memory hotplug.
Include the array check only when CONFIG_DEBUG_VM is set and save the
unnecessary check in production kernels.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sysctl_check.c')
0 files changed, 0 insertions, 0 deletions
