linux-kernel - Re: [PATCH] perf: make perf.data more self-descriptive (v8)

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Message-ID: <20111206092905.GJ15738@erda.amd.com>
Date:	Tue, 6 Dec 2011 10:29:05 +0100
From:	Robert Richter <robert.richter@....com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	"acme@...hat.com" <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"dsahern@...il.com" <dsahern@...il.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: Re: [PATCH] perf: make perf.data more self-descriptive (v8)

On 05.12.11 11:24:05, Stephane Eranian wrote:
> The one thing I realized last week, is that all that header information, incl.
> the features bits do not seem to appear in the file perf.data file when you
> use the perf record pipe mode. We need to fix that otherwise, if you
> depend on information in those bits, it won't always be present. That's
> a major issue.

Yes, this is because pipes are not seakable, which is necessary to
write the features.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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