Buildresult: linus-rand/arm64-randconfig/arm64-gcc11 built on Jan 1 2022, 08:52

kisskb

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Status:	OK
Date/Time:	Jan 1 2022, 08:52
Duration:	0:10:12.604289
Builder:	blade46
Revision:	mm: vmscan: Reduce throttling due to a failure to make progress (`1b4e3f26f9f7553b260b8aed43967500961448a6)`
Target:	linus-rand/arm64-randconfig/arm64-gcc11
Branch:	linus-rand
Compiler:	arm64-gcc11 (aarch64-linux-gcc (GCC) 11.1.0 / GNU ld (GNU Binutils) 2.36.1)
Config:	randconfig (download)
Log:	Download original Possible warnings (1) .config:6723:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD Full Log # git rev-parse -q --verify 1b4e3f26f9f7553b260b8aed43967500961448a6^{commit} 1b4e3f26f9f7553b260b8aed43967500961448a6 already have revision, skipping fetch # git checkout -q -f -B kisskb 1b4e3f26f9f7553b260b8aed43967500961448a6 # git clean -qxdf # < git log -1 # commit 1b4e3f26f9f7553b260b8aed43967500961448a6 # Author: Mel Gorman <mgorman@techsingularity.net> # Date: Thu Dec 2 15:06:14 2021 +0000 # # mm: vmscan: Reduce throttling due to a failure to make progress # # Mike Galbraith, Alexey Avramov and Darrick Wong all reported similar # problems due to reclaim throttling for excessive lengths of time. In # Alexey's case, a memory hog that should go OOM quickly stalls for # several minutes before stalling. In Mike and Darrick's cases, a small # memcg environment stalled excessively even though the system had enough # memory overall. # # Commit 69392a403f49 ("mm/vmscan: throttle reclaim when no progress is # being made") introduced the problem although commit a19594ca4a8b # ("mm/vmscan: increase the timeout if page reclaim is not making # progress") made it worse. Systems at or near an OOM state that cannot # be recovered must reach OOM quickly and memcg should kill tasks if a # memcg is near OOM. # # To address this, only stall for the first zone in the zonelist, reduce # the timeout to 1 tick for VMSCAN_THROTTLE_NOPROGRESS and only stall if # the scan control nr_reclaimed is 0, kswapd is still active and there # were excessive pages pending for writeback. If kswapd has stopped # reclaiming due to excessive failures, do not stall at all so that OOM # triggers relatively quickly. Similarly, if an LRU is simply congested, # only lightly throttle similar to NOPROGRESS. # # Alexey's original case was the most straight forward # # for i in {1..3}; do tail /dev/zero; done # # On vanilla 5.16-rc1, this test stalled heavily, after the patch the test # completes in a few seconds similar to 5.15. # # Alexey's second test case added watching a youtube video while tail runs # 10 times. On 5.15, playback only jitters slightly, 5.16-rc1 stalls a # lot with lots of frames missing and numerous audio glitches. With this # patch applies, the video plays similarly to 5.15. # # [lkp@intel.com: Fix W=1 build warning] # # Link: https://lore.kernel.org/r/99e779783d6c7fce96448a3402061b9dc1b3b602.camel@gmx.de # Link: https://lore.kernel.org/r/20211124011954.7cab9bb4@mail.inbox.lv # Link: https://lore.kernel.org/r/20211022144651.19914-1-mgorman@techsingularity.net # Link: https://lore.kernel.org/r/20211202150614.22440-1-mgorman@techsingularity.net # Link: https://linux-regtracking.leemhuis.info/regzbot/regression/20211124011954.7cab9bb4@mail.inbox.lv/ # Reported-and-tested-by: Alexey Avramov <hakavlad@inbox.lv> # Reported-and-tested-by: Mike Galbraith <efault@gmx.de> # Reported-and-tested-by: Darrick J. Wong <djwong@kernel.org> # Reported-by: kernel test robot <lkp@intel.com> # Acked-by: Hugh Dickins <hughd@google.com> # Tracked-by: Thorsten Leemhuis <regressions@leemhuis.info> # Fixes: 69392a403f49 ("mm/vmscan: throttle reclaim when no progress is being made") # Signed-off-by: Mel Gorman <mgorman@techsingularity.net> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-ld --version # < git log --format=%s --max-count=1 1b4e3f26f9f7553b260b8aed43967500961448a6 # < make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux- randconfig # Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y # < make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux- help # make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux- olddefconfig .config:6723:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD # make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux- Completed OK # rm -rf /kisskb/build/linus-rand_arm64-randconfig_arm64-gcc11 # Build took: 0:10:12.604289

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