From: Peter Zijlstra <peterz@infradead.org>
To: eranian@google.com
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, paulus@samba.org,
davem@davemloft.net, fweisbec@gmail.com, robert.richter@amd.com,
perfmon2-devel@lists.sf.net, eranian@gmail.com
Subject: Re: [PATCH] perf_events: add PERF_SAMPLE_BRANCH_STACK
Date: Wed, 07 Apr 2010 15:15:27 +0200 [thread overview]
Message-ID: <1270646127.20295.976.camel@laptop> (raw)
In-Reply-To: <4bbc7fcf.100db80a.6b9f.fffffb14@mx.google.com>
On Wed, 2010-04-07 at 14:45 +0200, Stephane Eranian wrote:
> LBR is configured by default to record ALL taken branches. On some
> processors, it is possible to filter the type of branches. This will
> be supported in a subsequent patch.
>
> On other processors, the sample type is allowed but will generate a
> sample where nr=0 as is the case with other sampling types.
Right, so I already posted a patch like that:
http://lkml.org/lkml/2010/3/4/160
and the reason its not merged is because there is no perf use-case for
it. Ingo wants to avoid merging ABI bits for which there is no userspace
around. We already have a few such things and we find that its too easy
to regress on those part.
So if you want this, please also implement a useful use-case in perf.
next prev parent reply other threads:[~2010-04-07 13:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-07 12:45 [PATCH] perf_events: add PERF_SAMPLE_BRANCH_STACK Stephane Eranian
2010-04-07 13:15 ` Peter Zijlstra [this message]
2010-04-07 16:48 ` Stephane Eranian
2010-04-07 16:54 ` Peter Zijlstra
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