Re: [PATCHSET 00/12] perf tools: Apply percent-limit to callchains
From: Jiri Olsa
Date: Tue Jan 26 2016 - 11:15:26 EST
On Wed, Jan 27, 2016 at 12:54:17AM +0900, Namhyung Kim wrote:
SNIP
> > > > > > 0.04% 0.04% perf [kernel.vmlinux] [k] x86_pmu_enable
> > > > > > 0.04% 0.04% perf [kernel.vmlinux] [k] native_apic_mem_write
> > > > > >
> > > > >
> > > > > What's the problem? Now by default callchains under 0.5% (absolute)
> > > > > will not be shown. I think this is intended output, and we need to
> > > > > consider changing the default percent limit.
> > > >
> > > > hm, just the TUI shows +- for entries with no callchain
> > >
> > > Humm, this is an old bug, never got around to try to fix it, or is this
> > > something you were not experiencing before this patchkit from Namhyung?
> > >
> >
> > well, there were callchains present before this patchset ;-)
>
> That is because we apply percent limit to callchains now, and the
> default is 0.5%. Before this patchset percent limit seems not applied
> so you saw the callchains under the limit.
I'm just saying that in TUI I see entries without callcains (which are filtered out)
but those entries are still marked with +- ... I dont know if that's some old issue
thanks,
jirka
---
+ 0.08% 0.00% perf [kernel.vmlinux] [k] perf_pmu_enable.part.87 â
+ 0.08% 0.00% perf [kernel.vmlinux] [k] perf_event_context_sched_in â
+ 0.08% 0.00% perf [kernel.vmlinux] [k] perf_event_exec â
+ 0.08% 0.00% perf [kernel.vmlinux] [k] setup_new_exec â
+ 0.08% 0.00% perf [kernel.vmlinux] [k] load_elf_binary â
+ 0.08% 0.00% perf [kernel.vmlinux] [k] search_binary_handler â
+ 0.08% 0.00% perf [kernel.vmlinux] [k] do_execveat_common.isra.33 â
+ 0.08% 0.00% perf [kernel.vmlinux] [k] sys_execve â
- 0.08% 0.00% perf [kernel.vmlinux] [k] return_from_execve â
- 0.08% 0.00% perf [unknown] [k] 0x00007f2175b35e07 â
- 0.04% 0.00% perf [kernel.vmlinux] [k] perf_event_nmi_handler â
- 0.04% 0.00% perf [kernel.vmlinux] [k] nmi_handle â
- 0.04% 0.00% perf [kernel.vmlinux] [k] default_do_nmi â
- 0.04% 0.00% perf [kernel.vmlinux] [k] do_nmi â
- 0.04% 0.00% perf [kernel.vmlinux] [k] end_repeat_nmi â
- 0.04% 0.04% perf [kernel.vmlinux] [k] x86_pmu_enable â
- 0.04% 0.04% perf [kernel.vmlinux] [k] native_apic_mem_write â