kernel_optimize_test/include
Johannes Weiner b910718a94 mm: vmscan: detect file thrashing at the reclaim root
We use refault information to determine whether the cache workingset is
stable or transitioning, and dynamically adjust the inactive:active file
LRU ratio so as to maximize protection from one-off cache during stable
periods, and minimize IO during transitions.

With cgroups and their nested LRU lists, we currently don't do this
correctly.  While recursive cgroup reclaim establishes a relative LRU
order among the pages of all involved cgroups, refaults only affect the
local LRU order in the cgroup in which they are occuring.  As a result,
cache transitions can take longer in a cgrouped system as the active pages
of sibling cgroups aren't challenged when they should be.

[ Right now, this is somewhat theoretical, because the siblings, under
  continued regular reclaim pressure, should eventually run out of
  inactive pages - and since inactive:active *size* balancing is also
  done on a cgroup-local level, we will challenge the active pages
  eventually in most cases. But the next patch will move that relative
  size enforcement to the reclaim root as well, and then this patch
  here will be necessary to propagate refault pressure to siblings. ]

This patch moves refault detection to the root of reclaim.  Instead of
remembering the cgroup owner of an evicted page, remember the cgroup that
caused the reclaim to happen.  When refaults later occur, they'll
correctly influence the cross-cgroup LRU order that reclaim follows.

I.e.  if global reclaim kicked out pages in some subgroup A/B/C, the
refault of those pages will challenge the global LRU order, and not just
the local order down inside C.

[hannes@cmpxchg.org:  use page_memcg() instead of another lookup]
  Link: http://lkml.kernel.org/r/20191115160722.GA309754@cmpxchg.org
Link: http://lkml.kernel.org/r/20191107205334.158354-3-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-12-01 12:59:07 -08:00
..
acpi Merge branches 'acpi-utils', 'acpi-platform', 'acpi-video' and 'acpi-doc' 2019-11-26 10:30:49 +01:00
asm-generic mm/memory.c: fix a huge pud insertion race during faulting 2019-12-01 06:29:19 -08:00
clocksource x86/hyperv: Initialize clockevents earlier in CPU onlining 2019-11-15 10:33:49 +01:00
crypto crypto: ablkcipher - remove deprecated and unused ablkcipher support 2019-11-17 09:02:49 +08:00
drm mm + drm coherent memory support for vmwgfx 2019-11-30 09:38:11 -08:00
dt-bindings Staging / IIO patches for 5.5-rc1 2019-11-27 10:57:52 -08:00
keys KEYS: trusted: Move TPM2 trusted keys code 2019-11-12 21:45:37 +02:00
kunit
kvm Merge remote-tracking branch 'kvmarm/misc-5.5' into kvmarm/next 2019-11-08 11:27:29 +00:00
linux mm: vmscan: detect file thrashing at the reclaim root 2019-12-01 12:59:07 -08:00
math-emu
media drm main pull for 5.5-rc1 2019-11-27 17:45:48 -08:00
misc
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-27 17:17:40 -08:00
pcmcia
ras
rdma hmm related patches for 5.5 2019-11-30 10:33:14 -08:00
scsi SCSI fixes on 20191101 2019-11-07 06:43:18 -07:00
soc net: mscc: ocelot: use skb queue instead of skbs list 2019-11-27 10:53:37 -08:00
sound ASoC: More updates for v5.5 2019-11-25 14:27:41 +01:00
target
trace rss_stat: add support to detect RSS updates of external mm 2019-12-01 06:29:18 -08:00
uapi mm + drm coherent memory support for vmwgfx 2019-11-30 09:38:11 -08:00
vdso
video
xen dma-mapping updates for 5.5-rc1 2019-11-28 11:16:43 -08:00
Kbuild ARM: 2019-11-25 18:02:36 -08:00