linux-kernel - Re: [PATCHSET 00/12] perf tools: Apply percent-limit to callchains

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Date:	Tue, 26 Jan 2016 12:30:36 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCHSET 00/12] perf tools: Apply percent-limit to callchains

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?

- Arnaldo