On Sat, Aug 17, 2019 at 08:36:16AM +0200, Greg KH wrote:
On Fri, Aug 16, 2019 at 05:47:26PM -0700, Roman Gushchin wrote:
Commit 766a4c19d880 ("mm/memcontrol.c: keep local VM counters in sync with the hierarchical ones") effectively decreased the precision of per-memcg vmstats_local and per-memcg-per-node lruvec percpu counters.
That's good for displaying in memory.stat, but brings a serious regression into the reclaim process.
One issue I've discovered and debugged is the following: lruvec_lru_size() can return 0 instead of the actual number of pages in the lru list, preventing the kernel to reclaim last remaining pages. Result is yet another dying memory cgroups flooding. The opposite is also happening: scanning an empty lru list is the waste of cpu time.
Also, inactive_list_is_low() can return incorrect values, preventing the active lru from being scanned and freed. It can fail both because the size of active and inactive lists are inaccurate, and because the number of workingset refaults isn't precise. In other words, the result is pretty random.
I'm not sure, if using the approximate number of slab pages in count_shadow_number() is acceptable, but issues described above are enough to partially revert the patch.
Let's keep per-memcg vmstat_local batched (they are only used for displaying stats to the userspace), but keep lruvec stats precise. This change fixes the dead memcg flooding on my setup.
Fixes: 766a4c19d880 ("mm/memcontrol.c: keep local VM counters in sync with the hierarchical ones") Signed-off-by: Roman Gushchin guro@fb.com Cc: Yafang Shao laoar.shao@gmail.com Cc: Johannes Weiner hannes@cmpxchg.org
mm/memcontrol.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
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This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.
Oh, I'm sorry, will read and follow next time. Thanks!
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