Em Mon, Feb 06, 2023 at 04:24:00PM -0800, Namhyung Kim escreveu: > Hello, > > When there're many lock contentions in the system, people sometimes > want to know who caused the contention, IOW who's the owner of the > locks. > > This patchset adds -o/--lock-owner option to track the owner info > if it's available. Right now, it supports mutex and rwsem as they > have the owner fields in themselves. Please see the patch 2 for the > details. > > Changes in v2) > * fix missing callstacks > * support old rwsem type with recent clang (>= 15.0) > > The patch 1 is a fix for missing callstacks and the patch 2 is the > main change. The patch 3 adds support for old kernels when compiler > supports a recent builtin to check field type in a struct (Thanks > to Hao). > > Example output (for mutex only): > > $ sudo ./perf lock con -abo -Y mutex -- ./perf bench sched pipe > # Running 'sched/pipe' benchmark: > # Executed 1000000 pipe operations between two processes > > Total time: 4.910 [sec] > > 4.910435 usecs/op > 203647 ops/sec > contended total wait max wait avg wait pid owner > > 2 15.50 us 8.29 us 7.75 us 1582852 sched-pipe > 7 7.20 us 2.47 us 1.03 us -1 Unknown > 1 6.74 us 6.74 us 6.74 us 1582851 sched-pipe > > You can get it from 'perf/lock-owner-v2' branch in > > git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git Thanks, applied. - Arnaldo > Thanks, > Namhyung > > Namhyung Kim (3): > perf lock contention: Fix to save callstack for the default modified > perf lock contention: Add -o/--lock-owner option > perf lock contention: Support old rw_semaphore type > > tools/perf/Documentation/perf-lock.txt | 5 + > tools/perf/builtin-lock.c | 52 +++++++++-- > tools/perf/util/bpf_lock_contention.c | 1 + > .../perf/util/bpf_skel/lock_contention.bpf.c | 91 ++++++++++++++++++- > tools/perf/util/lock-contention.h | 1 + > 5 files changed, 136 insertions(+), 14 deletions(-) > > > base-commit: 17f248aa8664ff5b3643491136283e73b5c18166 > -- > 2.39.1.519.gcb327c4b5f-goog > -- - Arnaldo
