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author | Johannes Weiner <hannes@cmpxchg.org> | 2014-09-05 08:43:57 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-09-05 08:19:02 -0700 |
commit | ce00a967377baadf2481521e131771adc7652856 (patch) | |
tree | df99fb2d2c1e2e0aa6873913decf53487e97391e /arch | |
parent | 10096fb1088e5c89b10772a1dfbe9682ecae5cea (diff) | |
download | linux-ce00a967377baadf2481521e131771adc7652856.tar.bz2 |
mm: memcontrol: revert use of root_mem_cgroup res_counter
Dave Hansen reports a massive scalability regression in an uncontained
page fault benchmark with more than 30 concurrent threads, which he
bisected down to 05b843012335 ("mm: memcontrol: use root_mem_cgroup
res_counter") and pin-pointed on res_counter spinlock contention.
That change relied on the per-cpu charge caches to mostly swallow the
res_counter costs, but it's apparent that the caches don't scale yet.
Revert memcg back to bypassing res_counters on the root level in order
to restore performance for uncontained workloads.
Reported-by: Dave Hansen <dave@sr71.net>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Dave Hansen <dave.hansen@intel.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions