Buildresult: linus/um-defconfig/um-x86_64-gcc12 built on Feb 28 2023, 20:38

kisskb

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Status:	OK
Date/Time:	Feb 28 2023, 20:38
Duration:	0:00:45.605565
Builder:	ka7
Revision:	vfs: avoid duplicating creds in faccessat if possible (`981ee95cc1f5905ae4936b0dd501085909cdc14f)`
Target:	linus/um-defconfig/um-x86_64-gcc12
Branch:	linus
Compiler:	um-x86_64-gcc12 (x86_64-linux-gcc.br_real (Buildroot 2021.11-4428-g6b6741b) 12.2.0 / GNU ld (GNU Binutils) 2.39)
Config:	defconfig (download)
Log:	Download original Possible warnings (6) /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: arch/x86/um/vdso/vdso.o: missing .note.GNU-stack section implies executable stack /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms1 has a LOAD segment with RWX permissions /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms1.o: missing .note.GNU-stack section implies executable stack /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms2 has a LOAD segment with RWX permissions /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms2.o: missing .note.GNU-stack section implies executable stack /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: vmlinux has a LOAD segment with RWX permissions 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/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 981ee95cc1f5905ae4936b0dd501085909cdc14f # < make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 defconfig # < make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 help # make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig # make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64-gcc12 CROSS_COMPILE=/opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/x86_64-linux- SUBARCH=x86_64 /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: arch/x86/um/vdso/vdso.o: missing .note.GNU-stack section implies executable stack /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms1 has a LOAD segment with RWX permissions /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms1.o: missing .note.GNU-stack section implies executable stack /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms2 has a LOAD segment with RWX permissions /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: .tmp_vmlinux.kallsyms2.o: missing .note.GNU-stack section implies executable stack /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker /opt/cross/kisskb/x86-64--glibc--bleeding-edge-2022.08-1/bin/../lib/gcc/x86_64-buildroot-linux-gnu/12.2.0/../../../../x86_64-buildroot-linux-gnu/bin/ld: warning: vmlinux has a LOAD segment with RWX permissions LINK linux Completed OK # rm -rf /kisskb/build/linus_um-defconfig_um-x86_64-gcc12 # Build took: 0:00:45.605565

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