From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Yan, Zheng" <zheng.z.yan@intel.com>,
linux-kernel@vger.kernel.org, mingo@kernel.org,
eranian@google.com, andi@firstfloor.org
Subject: Re: [PATCH 0/7] perf, x86: Haswell LBR call stack support
Date: Wed, 26 Jun 2013 18:40:27 +0200 [thread overview]
Message-ID: <20130626164027.GE6123@two.firstfloor.org> (raw)
In-Reply-To: <20130626115420.GG28407@twins.programming.kicks-ass.net>
> So on pretty much every program you'd be lucky to get the top of the
> callstack but can end up with nearly nothing.
The last few entries up are usually the interesting ones, and those will
be preserved.
Do you really care about main() for profiling?
When you pop back up there may be a few situations where you
have a very small visible stack, but as soon as the program
starts nesting deeper again that will be fixed.
> Given that, and the other limitations I don't think its a fair
> replacement for user callchains.
It's not intended to be a full replacement, just to cover
cases that cannot give you callgraphs at all today.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2013-06-26 16:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-25 8:47 [PATCH 0/7] perf, x86: Haswell LBR call stack support Yan, Zheng
2013-06-25 8:47 ` [PATCH 1/7] perf, x86: Reduce lbr_sel_map size Yan, Zheng
2013-06-25 12:33 ` Stephane Eranian
2013-06-26 6:05 ` Yan, Zheng
2013-06-25 8:47 ` [PATCH 2/7] perf, x86: Basic Haswell LBR call stack support Yan, Zheng
2013-06-25 12:37 ` Stephane Eranian
2013-06-26 2:42 ` Yan, Zheng
2013-06-25 8:47 ` [PATCH 3/7] perf, x86: Introduce x86 special perf event context Yan, Zheng
2013-06-25 8:47 ` [PATCH 4/7] perf, x86: Save/resotre LBR stack during context switch Yan, Zheng
2013-06-26 11:47 ` Peter Zijlstra
2013-06-25 8:47 ` [PATCH 5/7] perf, core: Pass perf_sample_data to perf_callchain() Yan, Zheng
2013-06-25 8:47 ` [PATCH 6/7] perf, x86: Use LBR call stack to get user callchain Yan, Zheng
2013-06-26 9:00 ` Stephane Eranian
2013-06-26 12:42 ` Stephane Eranian
2013-06-26 12:45 ` Stephane Eranian
2013-06-27 1:52 ` Yan, Zheng
2013-06-27 1:40 ` Yan, Zheng
2013-06-27 8:58 ` Stephane Eranian
2013-06-28 2:24 ` Yan, Zheng
2013-06-25 8:47 ` [PATCH 7/7] perf, x86: Discard zero length call entries in LBR call stack Yan, Zheng
2013-06-25 12:40 ` [PATCH 0/7] perf, x86: Haswell LBR call stack support Stephane Eranian
2013-06-25 15:27 ` Andi Kleen
2013-06-25 15:30 ` Andi Kleen
2013-06-26 11:54 ` Peter Zijlstra
2013-06-26 16:40 ` Andi Kleen [this message]
2013-06-26 16:48 ` Stephane Eranian
2013-06-27 8:07 ` Yan, Zheng
2013-06-26 12:07 ` Peter Zijlstra
2013-06-26 16:59 ` Andi Kleen
2013-06-26 17:11 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2013-01-30 6:30 Yan, Zheng
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