linux/tools
David Vernet c1a31a2f7a cgroup: fix racy check in alloc_pagecache_max_30M() helper function
alloc_pagecache_max_30M() in the cgroup memcg tests performs a 50MB
pagecache allocation, which it expects to be capped at 30MB due to the
calling process having a memory.high setting of 30MB.  After the
allocation, the function contains a check that verifies that MB(29) <
memory.current <= MB(30).  This check can actually fail
non-deterministically.

The testcases that use this function are test_memcg_high() and
test_memcg_max(), which set memory.min and memory.max to 30MB respectively
for the cgroup under test.  The allocation can slightly exceed this number
in both cases, and for memory.max, the process performing the allocation
will not have the OOM killer invoked as it's performing a pagecache
allocation.  This patchset therefore updates the above check to instead
use the verify_close() helper function.

Link: https://lkml.kernel.org/r/20220423155619.3669555-6-void@manifault.com
Signed-off-by: David Vernet <void@manifault.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-05-13 07:20:12 -07:00
..
accounting delayacct: track delays from memory compact 2022-01-20 08:52:55 +02:00
arch x86/tsx: Disable TSX development mode at boot 2022-04-11 09:58:40 +02:00
bootconfig
bpf Networking fixes for 5.18-rc2, including fixes from bpf and netfilter 2022-04-07 19:01:47 -10:00
build tools build: Filter out options and warnings not supported by clang 2022-04-09 12:34:16 -03:00
cgroup tools/cgroup/slabinfo: update to work with struct slab 2022-02-21 11:34:49 +01:00
counter kbuild: replace $(if A,A,B) with $(or A,B) 2022-02-15 12:25:56 +09:00
debugging
edid
firewire
firmware
gpio kbuild: replace $(if A,A,B) with $(or A,B) 2022-02-15 12:25:56 +09:00
hv kbuild: replace $(if A,A,B) with $(or A,B) 2022-02-15 12:25:56 +09:00
iio Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
include tools: Add kmem_cache_alloc_lru() 2022-04-22 14:24:28 -04:00
io_uring
kvm/kvm_stat
laptop
leds
lib perf tools: Fix segfault accessing sample_id xyarray 2022-04-13 22:23:02 -03:00
memory-model tools/memory-model: Explain syntactic and semantic dependencies 2022-02-01 17:32:30 -08:00
objtool objtool: Fix SLS validation for kcov tail-call replacement 2022-04-05 10:24:40 +02:00
pci kbuild: replace $(if A,A,B) with $(or A,B) 2022-02-15 12:25:56 +09:00
pcmcia
perf perf test: Fix error message for test case 71 on s390, where it is not supported 2022-04-22 18:39:34 -03:00
power tools/power/x86/intel-speed-select: fix build failure when using -Wl,--as-needed 2022-04-13 13:49:48 +02:00
rcu
scripts Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
spi kbuild: replace $(if A,A,B) with $(or A,B) 2022-02-15 12:25:56 +09:00
testing cgroup: fix racy check in alloc_pagecache_max_30M() helper function 2022-05-13 07:20:12 -07:00
thermal/tmon
time
tracing Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
usb kbuild: replace $(if A,A,B) with $(or A,B) 2022-02-15 12:25:56 +09:00
virtio tools/virtio: compile with -pthread 2022-03-28 16:52:59 -04:00
vm mm/page-flags: reuse PG_mappedtodisk as PG_anon_exclusive for PageAnon() pages 2022-05-09 18:20:44 -07:00
wmi
Makefile