Re: perf: bisected sampling bug in Linux 4.11-rc1

On Tue, 18 Jul 2017, Ingo Molnar wrote: > > Ok, great - if this works then I'll pick up this fix instead of the revert > that > I've queued up earlier today. sorry for the delay, I was out of town for a few days. I've tried the patch and it looks like it fixes the test in question and

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Tue, 18 Jul 2017, Ingo Molnar wrote: > > Ok, great - if this works then I'll pick up this fix instead of the revert > that > I've queued up earlier today. sorry for the delay, I was out of town for a few days. I've tried the patch and it looks like it fixes the test in question and

Re: perf: bisected sampling bug in Linux 4.11-rc1

* Alexander Shishkin wrote: > Vince Weaver writes: > > > I was tracking down some regressions in my perf_event_test testsuite. > > Some of the tests broke in the 4.11-rc1 timeframe. > > > > I've bisected one of them, this report is

Re: perf: bisected sampling bug in Linux 4.11-rc1

* Alexander Shishkin wrote: > Vince Weaver writes: > > > I was tracking down some regressions in my perf_event_test testsuite. > > Some of the tests broke in the 4.11-rc1 timeframe. > > > > I've bisected one of them, this report is about > > tests/overflow/simul_oneshot_group_overflow > >

Re: perf: bisected sampling bug in Linux 4.11-rc1

Vince Weaver writes: > I was tracking down some regressions in my perf_event_test testsuite. > Some of the tests broke in the 4.11-rc1 timeframe. > > I've bisected one of them, this report is about > tests/overflow/simul_oneshot_group_overflow > This test creates

Re: perf: bisected sampling bug in Linux 4.11-rc1

Vince Weaver writes: > I was tracking down some regressions in my perf_event_test testsuite. > Some of the tests broke in the 4.11-rc1 timeframe. > > I've bisected one of them, this report is about > tests/overflow/simul_oneshot_group_overflow > This test creates an event group containing

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Sat, 15 Jul 2017, Vince Weaver wrote: > Although there is a separate issue also introduced in 4.11-rc1 that still > fails a different testcase. I'm in the middle of bisecting that one and > probably won't have the result of the bisect until Monday. I went and bisected the other issue

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Sat, 15 Jul 2017, Vince Weaver wrote: > Although there is a separate issue also introduced in 4.11-rc1 that still > fails a different testcase. I'm in the middle of bisecting that one and > probably won't have the result of the bisect until Monday. I went and bisected the other issue

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Sat, 15 Jul 2017, Ingo Molnar wrote: > > * Vince Weaver wrote: > > > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit > > > > commit 487f05e18aa4efacee6357480f293a5afe6593b5 > > Author: Alexander Shishkin > >

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Sat, 15 Jul 2017, Ingo Molnar wrote: > > * Vince Weaver wrote: > > > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit > > > > commit 487f05e18aa4efacee6357480f293a5afe6593b5 > > Author: Alexander Shishkin > > Date: Thu Jan 19 18:43:30 2017 +0200 > > > > perf/core:

Re: perf: bisected sampling bug in Linux 4.11-rc1

* Vince Weaver wrote: > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit > > commit 487f05e18aa4efacee6357480f293a5afe6593b5 > Author: Alexander Shishkin > Date: Thu Jan 19 18:43:30 2017 +0200 > > perf/core:

Re: perf: bisected sampling bug in Linux 4.11-rc1

* Vince Weaver wrote: > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit > > commit 487f05e18aa4efacee6357480f293a5afe6593b5 > Author: Alexander Shishkin > Date: Thu Jan 19 18:43:30 2017 +0200 > > perf/core: Optimize event rescheduling on active contexts BTW., just to

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Fri, 14 Jul 2017, Alexander Shishkin wrote: > Vince Weaver writes: > > > I was tracking down some regressions in my perf_event_test testsuite. > > Some of the tests broke in the 4.11-rc1 timeframe. > > > > I've bisected one of them, this report is about > >

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Fri, 14 Jul 2017, Alexander Shishkin wrote: > Vince Weaver writes: > > > I was tracking down some regressions in my perf_event_test testsuite. > > Some of the tests broke in the 4.11-rc1 timeframe. > > > > I've bisected one of them, this report is about > >

Re: perf: bisected sampling bug in Linux 4.11-rc1

Vince Weaver writes: > I was tracking down some regressions in my perf_event_test testsuite. > Some of the tests broke in the 4.11-rc1 timeframe. > > I've bisected one of them, this report is about > tests/overflow/simul_oneshot_group_overflow > This test creates

Re: perf: bisected sampling bug in Linux 4.11-rc1

Vince Weaver writes: > I was tracking down some regressions in my perf_event_test testsuite. > Some of the tests broke in the 4.11-rc1 timeframe. > > I've bisected one of them, this report is about > tests/overflow/simul_oneshot_group_overflow > This test creates an event group containing

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Fri, 14 Jul 2017, Vince Weaver wrote: > On a good kernel you get the following: > Event perf::instructions with period 100 > Event perf::instructions with period 200 > fd 3 overflows: 946 (perf::instructions/100) > fd 4 overflows: 473

Re: perf: bisected sampling bug in Linux 4.11-rc1

On Fri, 14 Jul 2017, Vince Weaver wrote: > On a good kernel you get the following: > Event perf::instructions with period 100 > Event perf::instructions with period 200 > fd 3 overflows: 946 (perf::instructions/100) > fd 4 overflows: 473

perf: bisected sampling bug in Linux 4.11-rc1

I was tracking down some regressions in my perf_event_test testsuite. Some of the tests broke in the 4.11-rc1 timeframe. I've bisected one of them, this report is about tests/overflow/simul_oneshot_group_overflow This test creates an event group containing two sampling events, set to

perf: bisected sampling bug in Linux 4.11-rc1

I was tracking down some regressions in my perf_event_test testsuite. Some of the tests broke in the 4.11-rc1 timeframe. I've bisected one of them, this report is about tests/overflow/simul_oneshot_group_overflow This test creates an event group containing two sampling events, set to