Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1687594
| From | Vince Weaver <vincent.weaver@maine.edu> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: perf: bisected sampling bug in Linux 4.11-rc1 |
| Date | 2017-07-14 20:30 +0200 |
| Message-ID | <u3dvH-7f8-1@gated-at.bofh.it> (permalink) |
| References | <u3dcm-75z-29@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, 14 Jul 2017, Vince Weaver wrote: > On a good kernel you get the following: > Event perf::instructions with period 1000000 > Event perf::instructions with period 2000000 > fd 3 overflows: 946 (perf::instructions/1000000) > fd 4 overflows: 473 (perf::instructions/2000000) > Ending counts: > Count 0: 946379875 > Count 1: 946365218 > > With the broken kernels you get: > Event perf::instructions with period 1000000 > Event perf::instructions with period 2000000 > fd 3 overflows: 938 (perf::instructions/1000000) > fd 4 overflows: 318 (perf::instructions/2000000) > Ending counts: > Count 0: 946373080 > Count 1: 653373058 additional relevant detail: in the failing case, the group leader of the event set has .pinned=1 If I change that to .pinned=0 then the test passes. Vince
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
perf: bisected sampling bug in Linux 4.11-rc1 Vince Weaver <vincent.weaver@maine.edu> - 2017-07-14 20:10 +0200
Re: perf: bisected sampling bug in Linux 4.11-rc1 Vince Weaver <vincent.weaver@maine.edu> - 2017-07-14 20:30 +0200
Re: perf: bisected sampling bug in Linux 4.11-rc1 Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2017-07-14 22:10 +0200
Re: perf: bisected sampling bug in Linux 4.11-rc1 Vince Weaver <vincent.weaver@maine.edu> - 2017-07-14 22:20 +0200
Re: perf: bisected sampling bug in Linux 4.11-rc1 Ingo Molnar <mingo@kernel.org> - 2017-07-15 13:10 +0200
Re: perf: bisected sampling bug in Linux 4.11-rc1 Vince Weaver <vincent.weaver@maine.edu> - 2017-07-15 16:40 +0200
Re: perf: bisected sampling bug in Linux 4.11-rc1 Vince Weaver <vincent.weaver@maine.edu> - 2017-07-16 05:10 +0200
csiph-web