linux-kernel - Re: [PATCH 16/17] perf, tool: Add dso data caching

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Message-ID: <20120725171059.GF1173@somewhere.redhat.com>
Date:	Wed, 25 Jul 2012 19:11:02 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, eranian@...gle.com,
	gorcunov@...nvz.org, tzanussi@...il.com, mhiramat@...hat.com,
	robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 16/17] perf, tool: Add dso data caching

On Sun, Jul 22, 2012 at 02:14:39PM +0200, Jiri Olsa wrote:
> Adding dso data caching so we don't need to open/read/close,
> each time we want dso data.
> 
> The DSO data caching affects following functions:
>   dso__data_read_offset
>   dso__data_read_addr
> 
> Each DSO read tries to find the data (based on offset) inside
> the cache. If it's not present it fills the cache from file,
> and returns the data. If it is present, data are returned
> with no file read.
> 
> Each data read is cached by reading cache page sized/aligned
> amount of DSO data. The cache page size is hardcoded to 4096.
> The cache is using RB tree with file offset as a sort key.
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>

Nice idea.

> ---
>  tools/perf/util/symbol.c |  154 ++++++++++++++++++++++++++++++++++++++++------

There seem to be an increasing need to move dso related things
to some util/dso.c file. Just suggesting.
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