# git rev-parse -q --verify 0bcfe68b876748762557797a940d0a82de700629^{commit}
0bcfe68b876748762557797a940d0a82de700629
already have revision, skipping fetch
# git checkout -q -f -B kisskb 0bcfe68b876748762557797a940d0a82de700629
# git clean -qxdf
# < git log -1
# commit 0bcfe68b876748762557797a940d0a82de700629
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue Sep 7 11:26:23 2021 -0700
# 
#     Revert "memcg: enable accounting for pollfd and select bits arrays"
#     
#     This reverts commit b655843444152c0a14b749308e4cb35d91cbcf0b.
#     
#     Just like with the memcg lock accounting, the kernel test robot reports
#     a sizeable performance regression for this commit, and while it clearly
#     does the rigth thing in theory, we'll need to look at just how to avoid
#     or minimize the performance overhead of the memcg accounting.
#     
#     People already have suggestions on how to do that, but it's "future
#     work".
#     
#     So revert it for now.
#     
#     [ Note: the first link below is for this same commit but a different
#       commit ID, because it's the kernel test robot ended up noticing it in
#       Andrew Morton's patch queue ]
#     
#     Link: https://lore.kernel.org/lkml/20210905132732.GC15026@xsang-OptiPlex-9020/
#     Link: https://lore.kernel.org/lkml/20210907150757.GE17617@xsang-OptiPlex-9020/
#     Acked-by: Jens Axboe <axboe@kernel.dk>
#     Acked-by: Shakeel Butt <shakeelb@google.com>
#     Acked-by: Roman Gushchin <guro@fb.com>
#     Cc: Tejun Heo <tj@kernel.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-gcc --version
# < /opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-ld --version
# < git log --format=%s --max-count=1 0bcfe68b876748762557797a940d0a82de700629
# < make -s -j 120 ARCH=xtensa O=/kisskb/build/linus_xtensa-defconfig_xtensa CROSS_COMPILE=/opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-  defconfig
# < make -s -j 120 ARCH=xtensa O=/kisskb/build/linus_xtensa-defconfig_xtensa CROSS_COMPILE=/opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-  help
# make -s -j 120 ARCH=xtensa O=/kisskb/build/linus_xtensa-defconfig_xtensa CROSS_COMPILE=/opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-  olddefconfig
# make -s -j 120 ARCH=xtensa O=/kisskb/build/linus_xtensa-defconfig_xtensa CROSS_COMPILE=/opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-  
Completed OK
# rm -rf /kisskb/build/linus_xtensa-defconfig_xtensa
# Build took: 0:00:21.814536