Em Wed, Jan 17, 2018 at 10:33:42AM -0300, Arnaldo Carvalho de Melo escreveu: > Em Tue, Jan 16, 2018 at 04:06:22PM +0100, Jiri Olsa escreveu: > > On Tue, Jan 16, 2018 at 08:40:38PM +0800, Cheng Jian wrote: > > > after this patch, perf script(parent-1040, child-1041):
> > > test_fork 1040 [002] 36.536079: sched:sched_wakeup_new: > > > comm=test_fork pid=1041 prio=120 target_cpu=003 > > > It will match it only once for tracing task(child-1041). > > > Signed-off-by: Cheng Jian <cj.chengj...@huawei.com> > > the duplicated events are gone.. solution looks ok to me > > Reviewed-and-Tested-by: Jiri Olsa <jo...@kernel.org> > I noticed that in the past as well, will try to test this too. Unpatched kernel: [root@jouet ~]# perf trace --no-syscalls -e sched:sched_wakeup_new time sleep 1 0.000 sched:sched_wakeup_new:time:13571 [120] success=1 CPU:003) 18446744073709.547 sched:sched_wakeup_new:time:13571 [120] success=1 CPU:003) 18446744073709.551 sched:sched_wakeup_new:time:13571 [120] success=1 CPU:003) 18446744073709.551 sched:sched_wakeup_new:time:13571 [120] success=1 CPU:003) 18446744073709.551 sched:sched_wakeup_new:time:13571 [120] success=1 CPU:003) 0.00user 0.00system 0:01.00elapsed 0%CPU (0avgtext+0avgdata 1996maxresident)k 0inputs+0outputs (0major+71minor)pagefaults 0swaps [root@jouet ~]# Patched kernel: [root@seventh ~]# perf trace --no-syscalls -e sched:sched_wakeup_new time sleep 1 0.000 sched:sched_wakeup_new:comm=time pid=339 prio=120 target_cpu=002) 0.001 sched:sched_wakeup_new:comm=time pid=339 prio=120 target_cpu=002) 0.00user 0.00system 0:01.00elapsed 0%CPU (0avgtext+0avgdata 2084maxresident)k 0inputs+0outputs (0major+75minor)pagefaults 0swaps [root@seventh ~]#