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SubjectRe: [PATCHSET 00/12] perf tools: Apply percent-limit to callchains
On Tue, Jan 26, 2016 at 04:41:16PM +0100, Jiri Olsa wrote:
> On Tue, Jan 26, 2016 at 12:30:36PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Jan 26, 2016 at 04:18:00PM +0100, Jiri Olsa escreveu:
> > > On Tue, Jan 26, 2016 at 11:49:07PM +0900, Namhyung Kim wrote:
> > >
> > > SNIP
> > >
> > > > > __hrtimer_run_queues
> > > > > tick_sched_timer
> > > > > tick_sched_handle.isra.17
> > > > > update_process_times
> > > > > scheduler_tick
> > > > > perf_event_task_tick
> > > > > perf_pmu_enable.part.87
> > > > > x86_pmu_enable
> > > > > intel_pmu_enable_all
> > > > > intel_bts_enable_local
> > > > >
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] perf_pmu_enable.part.87
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] perf_event_context_sched_in
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] perf_event_exec
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] setup_new_exec
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] load_elf_binary
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] search_binary_handler
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] do_execveat_common.isra.33
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] sys_execve
> > > > > 0.08% 0.00% perf [kernel.vmlinux] [k] return_from_execve
> > > > > 0.08% 0.00% perf [unknown] [k] 0x00007f2175b35e07
> > > > > 0.04% 0.00% perf [kernel.vmlinux] [k] perf_event_nmi_handler
> > > > > 0.04% 0.00% perf [kernel.vmlinux] [k] nmi_handle
> > > > > 0.04% 0.00% perf [kernel.vmlinux] [k] default_do_nmi
> > > > > 0.04% 0.00% perf [kernel.vmlinux] [k] do_nmi
> > > > > 0.04% 0.00% perf [kernel.vmlinux] [k] end_repeat_nmi
> > > > > 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.

Thanks,
Namhyung

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