linux-kernel - Re: [RFC/PATCH 1/2] perf top: Fix -z option behavior

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Message-ID: <53EA6495.4010600@gmail.com>
Date:	Tue, 12 Aug 2014 13:01:41 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...gle.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC/PATCH 1/2] perf top: Fix -z option behavior

On 8/12/14, 2:16 AM, Namhyung Kim wrote:
> The current -z option does almost nothing.  It doesn't zero the
> existing samples so that we can see profiles of exited process after
> last refresh.  It seems it only affects annotation.
>
> This patch clears existing entries before processing if -z option is
> given.  For this original decaying logic also moved before processing.

This option was broken somewhere recently. I am on vacation for another 
week, so I can't do a git bisect myself but I recall it worked a year or 
so ago. Try v3.4 as a start point.

David
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