From: "Yan, Zheng" <zheng.z.yan@intel.com>
To: linux-kernel@vger.kernel.org, a.p.zijlstra@chello.nl
Cc: eranian@google.com, ak@linux.intel.com, "Yan,
Zheng" <zheng.z.yan@intel.com>
Subject: [PATCH V2 0/7] perf, x86: Haswell LBR call stack support
Date: Wed, 24 Oct 2012 13:59:03 +0800 [thread overview]
Message-ID: <1351058350-9159-1-git-send-email-zheng.z.yan@intel.com> (raw)
From: "Yan, Zheng" <zheng.z.yan@intel.com>
Haswell has a new feature that utilizes the existing Last Branch Record
facility to record call chains. When the feature is enabled, function
call will be collected as normal, but as return instructions are executed
the last captured branch record is popped from the on-chip LBR registers.
The LBR call stack facility can help perf to get call chains of progam
without frame pointer.
The LBR call stack has following known limitations
1. Zero length calls are not filtered out by hardware
2. Exception handing such as setjmp/longjmp will have calls/returns not
match
3. Pushing different return address onto the stack will have calls/returns
not match
The patch series depends on Andi's "perf PMU support for Haswel" patches
---
Changes since v1
- not expose PERF_SAMPLE_BRANCH_CALL_STACK to user space
- save/restore LBR stack on context switch for all sampling branch modes
- reduce lbr_sel_map size
next reply other threads:[~2012-10-24 5:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-24 5:59 Yan, Zheng [this message]
2012-10-24 5:59 ` [PATCH V2 1/7] perf, x86: Reduce lbr_sel_map size Yan, Zheng
2012-10-24 7:28 ` Stephane Eranian
2012-10-24 7:49 ` Yan, Zheng
2012-10-24 8:15 ` Stephane Eranian
2012-10-24 8:23 ` Yan, Zheng
2012-10-24 8:37 ` Yan, Zheng
2012-10-24 8:53 ` Stephane Eranian
2012-10-24 5:59 ` [PATCH V2 2/7] perf, x86: Basic Haswell LBR call stack support Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 3/7] perf, x86: Introduce x86 special perf event context Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 4/7] perf, x86: Save/resotre LBR stack during context switch Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 5/7] perf, core: Pass perf_sample_data to perf_callchain() Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 6/7] perf, x86: Use LBR call stack to get user callchain Yan, Zheng
2012-10-24 8:57 ` Stephane Eranian
2012-10-24 11:23 ` Yan, Zheng
2012-10-24 11:47 ` Stephane Eranian
2012-10-24 11:52 ` Yan, Zheng
2012-10-24 12:11 ` Stephane Eranian
2012-10-24 12:21 ` Stephane Eranian
2012-10-24 12:31 ` Andi Kleen
2012-10-24 12:36 ` Stephane Eranian
2012-10-24 12:41 ` Andi Kleen
2012-10-24 12:46 ` Yan, Zheng
2012-10-24 5:59 ` [PATCH V2 7/7] perf, x86: Discard zero length call entries in LBR call stack Yan, Zheng
2012-10-25 9:12 ` Namhyung Kim
2012-10-24 8:49 ` [PATCH V2 0/7] perf, x86: Haswell LBR call stack support Stephane Eranian
2013-07-01 7:23 [PATCH v2 " Yan, Zheng
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