linux-kernel - Re: [PATCH] perf report: Fix branch stack mode cannot be set

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Message-ID: <20150227163143.GN13373@kernel.org>
Date:	Fri, 27 Feb 2015 13:31:43 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	He Kuang <hekuang@...wei.com>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	wangnan0@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf report: Fix branch stack mode cannot be set

Em Fri, Feb 27, 2015 at 05:58:44PM +0800, He Kuang escreveu:
> ping..

Thanks, applied to perf/core.

- Arnaldo

> 在 2015/2/15 10:33, He Kuang 写道:
> >When perf.data file be abtained by using 'perf record -b', perf report
> >should use branch stack mode to generate output. But this function is
> >broken by improper comparison between boolean and constant -1.
> >
> >before this patch:
> >$perf report -b -i perf.data
> >Samples: 16  of event 'cycles', Event count (approx.): 3171896
> >Overhead  Command  Shared Object      Symbol
> >   13.59%  ls       [kernel.kallsyms]  [k] prio_tree_remove
> >   13.16%  ls       [kernel.kallsyms]  [k] change_pte_range
> >   12.09%  ls       [kernel.kallsyms]  [k] page_fault
> >   12.02%  ls       [kernel.kallsyms]  [k] zap_pte_range
> >...
> >
> >after this patch:
> >$perf report -b -i perf.data
> >Samples: 256  of event 'cycles', Event count (approx.): 256
> >Overhead  Command  Source Shared Object  Source Symbol                               Target Shared Object  Target Symbol
> >    9.38%  ls       [unknown]             [k] 0000000000000000                        [unknown]             [k] 0000000000000000
> >    6.25%  ls       libc-2.19.so          [.] _dl_addr                                libc-2.19.so          [.] _dl_addr
> >    6.25%  ls       [kernel.kallsyms]     [k] zap_pte_range                           [kernel.kallsyms]     [k] zap_pte_range
> >    6.25%  ls       [kernel.kallsyms]     [k] change_pte_range                        [kernel.kallsyms]     [k] change_pte_range
> >    0.39%  ls       [kernel.kallsyms]     [k] prio_tree_remove                        [kernel.kallsyms]     [k] prio_tree_remove
> >...
> >
> >Signed-off-by: He Kuang <hekuang@...wei.com>
> >---
> >  tools/perf/builtin-report.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> >index 2f91094..ecc453b 100644
> >--- a/tools/perf/builtin-report.c
> >+++ b/tools/perf/builtin-report.c
> >@@ -766,7 +766,7 @@ repeat:
> >  	 * 0/1 means the user chose a mode.
> >  	 */
> >  	if (((branch_mode == -1 && has_br_stack) || branch_mode == 1) &&
> >-	    branch_call_mode == -1) {
> >+	    !branch_call_mode) {
> >  		sort__mode = SORT_MODE__BRANCH;
> >  		symbol_conf.cumulate_callchain = false;
> >  	}
> 
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