linux-kernel - Re: [PATCH v2 4/4] perf-top: add --max-stack option to limit callchain stack scan

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Date:	Fri, 18 Oct 2013 11:31:13 -0600
From:	David Ahern <dsahern@...il.com>
To:	Waiman Long <Waiman.Long@...com>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>
Subject: Re: [PATCH v2 4/4] perf-top: add --max-stack option to limit callchain
 stack scan

On 10/18/13 8:38 AM, Waiman Long wrote:
> When the callgraph function is enabled (-G), it may take a long time to
> scan all the stack data and merge them accordingly.
>
> This patch adds a new --max-stack option to perf-top to limit the depth
> of callchain stack data to look at to reduce the time it takes for
> perf-top to finish its processing. It reduces the amount of information
> provided to the user in exchange for faster speed.
>
> Signed-off-by: Waiman Long <Waiman.Long@...com>
> ---
>   tools/perf/Documentation/perf-top.txt |    8 ++++++++
>   tools/perf/builtin-top.c              |    8 ++++++--
>   tools/perf/util/top.h                 |    1 +
>   3 files changed, 15 insertions(+), 2 deletions(-)
>

Looks good to me. Acked-by: David Ahern <dsahern@...il.com>


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