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authorArnaldo Carvalho de Melo2015-02-13 12:32:45 -0300
committerArnaldo Carvalho de Melo2015-02-13 12:43:00 -0300
commit42052bea1683fad5a7a06d84a3b4f7bd16131ce8 (patch)
tree5ffd592190373cf1d2625f84ef0f4496c469ade8 /COPYING
parent619a303c1b8bd22abc549477d038ef9b5c1fe1bd (diff)
perf trace: Print thread info when following children
The default for 'trace workload' is to set perf_event_attr.inherit to 1, i.e. to make it equivalent to 'strace -f workload', so we were ending with syscalls for multiple processes mixed up, fix it: Before: [root@ssdandy ~]# trace -e brk time usleep 1 0.071 ( 0.002 ms): brk( ) = 0x100e000 0.802 ( 0.001 ms): brk( ) = 0x1d99000 1.132 ( 0.003 ms): brk( ) = 0x1d99000 1.136 ( 0.003 ms): brk(brk: 0x1dba000) = 0x1dba000 1.140 ( 0.001 ms): brk( ) = 0x1dba000 0.00user 0.00system 0:00.00elapsed 63%CPU (0avgtext+0avgdata 528maxresident)k 0inputs+0outputs (0major+181minor)pagefaults 0swaps [root@ssdandy ~]# After: [root@ssdandy ~]# trace -f -e brk time usleep 1 0.072 ( 0.002 ms): time/26308 brk( ) = 0x1e6e000 0.860 ( 0.001 ms): usleep/26309 brk( ) = 0xb91000 1.193 ( 0.003 ms): usleep/26309 brk( ) = 0xb91000 1.197 ( 0.003 ms): usleep/26309 brk(brk: 0xbb2000) = 0xbb2000 1.201 ( 0.001 ms): usleep/26309 brk( ) = 0xbb2000 0.00user 0.00system 0:00.00elapsed 0%CPU (0avgtext+0avgdata 524maxresident)k 0inputs+0outputs (0major+180minor)pagefaults 0swaps [root@ssdandy ~]# BTW: to achieve the 'strace workload' behaviour, i.e. without a explicit '-f', one has to use --no-inherit. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> echo Link: http://lkml.kernel.org/n/tip-`ranpwd -l 24`@git.kernel.org Link: http://lkml.kernel.org/n/tip-2wu2d5n65msxoq1i7vtcaft2@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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