linux-kernel - Re: [PATCH v4 07/18] perf: add generic memory sampling interface

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Message-ID: <20130105183816.GA995@krava.brq.redhat.com>
Date:	Sat, 5 Jan 2013 19:38:16 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, namhyung.kim@....com
Subject: Re: [PATCH v4 07/18] perf: add generic memory sampling interface

On Thu, Dec 20, 2012 at 04:41:37PM +0100, Stephane Eranian wrote:
> This patch adds PERF_SAMPLE_COST and PERF_SAMPLE_DSRC.

I guess PERF_SAMPLE_COST was replaced by PERF_SAMPLE_WEIGHT added by Andi

jirka

> The first collects a cost associated with the sampled
> event. In case of memory access, the cost would be
> the latency of the load, otherwise it defaults to
> the sampling period.
> 
> PERF_SAMPLE_DSRC collects the data source, i.e., where
> did the data associated with the sampled instruction
> come from. Information is stored in a perf_mem_dsrc
> structure. It contains opcode, mem level, tlb, snoop,
> lock information, subject to availability in hardware.
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
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