Package: linux-perf-4.2 Version: 4.2-2 Severity: minor perf stop to unwind backtrace on __lll_unlock_wake.
steps to reproduce perf record -e syscalls:sys_enter_futex -e syscalls:sys_exit_futex --call-graph dwarf -a -e cycles <some activity in application with mutex contension here> perf report -n --sort comm | less result: backtrace stopped on __lll_unlock_wake <<<<< | |--69.04%-- __lll_unlock_wake | _L_unlock_554 | |--24.32%-- __lll_lock_wait | _L_lock_909 | >>>>> expected: backtrace must continue after __lll_unlock_wake -- System Information: Debian Release: 8.2 APT prefers stable APT policy: (600, 'stable'), (599, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 4.2.0 (SMP w/4 CPU cores; PREEMPT) Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages linux-perf-4.2 depends on: ii libaudit1 1:2.4-1+b1 ii libc6 2.19-18+deb8u1 ii libc6-i386 2.19-18+deb8u1 ii libc6-x32 2.19-18+deb8u1 ii libdw1 0.159-4.2 ii libelf1 0.159-4.2 ii libnuma1 2.0.10-1 ii libperl5.20 5.20.2-3+deb8u1 ii libpython2.7 2.7.9-2 ii libslang2 2.3.0-2 ii libunwind8 1.1-4 ii zlib1g 1:1.2.8.dfsg-2+b1 Versions of packages linux-perf-4.2 recommends: ii linux-base 3.5 Versions of packages linux-perf-4.2 suggests: pn linux-doc-4.2 <none> -- no debconf information -- with best regards // pub 1024D/E99AF373 <pgp.mit.edu>
