Buildresult: linus/sun3_defconfig/m68k-gcc11 built on Feb 28 2023, 14:34
kisskb
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Status:
OK
Date/Time:
Feb 28 2023, 14:34
Duration:
0:03:31.138440
Builder:
blade4b
Revision:
vfs: avoid duplicating creds in faccessat if possible (
981ee95cc1f5905ae4936b0dd501085909cdc14f)
Target:
linus/sun3_defconfig/m68k-gcc11
Branch:
linus
Compiler:
m68k-gcc11
(m68k-linux-gcc (GCC) 11.3.0 / GNU ld (GNU Binutils) 2.38)
Config:
sun3_defconfig
(
download
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Log:
Download original
Possible warnings (1)
include/linux/list.h:74:19: warning: 'seed_devices' may be used uninitialized in this function [-Wmaybe-uninitialized]
Full Log
# git rev-parse -q --verify 981ee95cc1f5905ae4936b0dd501085909cdc14f^{commit} 981ee95cc1f5905ae4936b0dd501085909cdc14f already have revision, skipping fetch # git checkout -q -f -B kisskb 981ee95cc1f5905ae4936b0dd501085909cdc14f # git clean -qxdf # < git log -1 # commit 981ee95cc1f5905ae4936b0dd501085909cdc14f # Author: Mateusz Guzik <mjguzik@gmail.com> # Date: Wed Jan 25 16:55:57 2023 +0100 # # vfs: avoid duplicating creds in faccessat if possible # # access(2) remains commonly used, for example on exec: # access("/etc/ld.so.preload", R_OK) # # or when running gcc: strace -c gcc empty.c # # % time seconds usecs/call calls errors syscall # ------ ----------- ----------- --------- --------- ---------------- # 0.00 0.000000 0 42 26 access # # It falls down to do_faccessat without the AT_EACCESS flag, which in turn # results in allocation of new creds in order to modify fsuid/fsgid and # caps. This is a very expensive process single-threaded and most notably # multi-threaded, with numerous structures getting refed and unrefed on # imminent new cred destruction. # # Turns out for typical consumers the resulting creds would be identical # and this can be checked upfront, avoiding the hard work. # # An access benchmark plugged into will-it-scale running on Cascade Lake # shows: # # test proc before after # access1 1 1310582 2908735 (+121%) # distinct files # access1 24 4716491 63822173 (+1353%) # distinct files # access2 24 2378041 5370335 (+125%) # same file # # The above benchmarks are not integrated into will-it-scale, but can be # found in a pull request: # # https://github.com/antonblanchard/will-it-scale/pull/36/files # # Signed-off-by: Mateusz Guzik <mjguzik@gmail.com> # Cc: Al Viro <viro@zeniv.linux.org.uk> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-ld --version # < git log --format=%s --max-count=1 981ee95cc1f5905ae4936b0dd501085909cdc14f # < make -s -j 24 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux- sun3_defconfig # < make -s -j 24 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux- help # make -s -j 24 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux- olddefconfig # make -s -j 24 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux- In file included from /kisskb/src/include/linux/rculist.h:10, from /kisskb/src/include/linux/pid.h:5, from /kisskb/src/include/linux/sched.h:14, from /kisskb/src/fs/btrfs/volumes.c:6: /kisskb/src/fs/btrfs/volumes.c: In function 'btrfs_init_new_device': /kisskb/src/include/linux/list.h:74:19: warning: 'seed_devices' may be used uninitialized in this function [-Wmaybe-uninitialized] 74 | new->prev = prev; | ~~~~~~~~~~^~~~~~ /kisskb/src/fs/btrfs/volumes.c:2612:34: note: 'seed_devices' was declared here 2612 | struct btrfs_fs_devices *seed_devices; | ^~~~~~~~~~~~ Completed OK # rm -rf /kisskb/build/linus_sun3_defconfig_m68k-gcc11 # Build took: 0:03:31.138440
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