From: Arun Sharma <asharma@fb.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>,
<linux-kernel@vger.kernel.org>, <mingo@elte.hu>,
<acme@infradead.org>, <robert.richter@amd.com>,
<ming.m.lin@intel.com>, <andi@firstfloor.org>,
<ravitillo@lbl.gov>, <vweaver1@eecs.utk.edu>
Subject: Re: [PATCH 00/13] perf_events: add support for sampling taken branches (v3)
Date: Fri, 27 Jan 2012 10:20:45 -0800 [thread overview]
Message-ID: <4F22EAFD.1020006@fb.com> (raw)
In-Reply-To: <1327666141.2446.168.camel@twins>
On 1/27/12 4:09 AM, Peter Zijlstra wrote:
>> Here is a kernel example, where we want to sample indirect calls:
>> $ perf record -a -C 1 -b ind_call -e r1c4:k sleep 10
>> $ perf report -b
>> #
>> # Overhead Source Symbol Target Symbol
>> # ........ .......................... ..........................
>> #
>> 36.36% [k] __delay [k] delay_tsc
>> 9.09% [k] ktime_get [k] read_tsc
>> 9.09% [k] getnstimeofday [k] read_tsc
>> 9.09% [k] notifier_call_chain [k] tick_notify
>> 4.55% [k] cpuidle_idle_call [k] intel_idle
>> 4.55% [k] cpuidle_idle_call [k] menu_reflect
>> 2.27% [k] handle_irq [k] handle_edge_irq
>> 2.27% [k] ack_apic_edge [k] native_apic_mem_write
>> 2.27% [k] hpet_interrupt_handler [k] hrtimer_interrupt
>> 2.27% [k] __run_hrtimer [k] watchdog_timer_fn
>> 2.27% [k] enqueue_task [k] enqueue_task_rt
>> 2.27% [k] try_to_wake_up [k] select_task_rq_rt
>> 2.27% [k] do_timer [k] read_tsc
>>
>> Due to HW limitations, branch filtering may be approximate on
>> Core, Atom processors. It is more accurate on Nehalem, Westmere
>> and best on Sandy Bridge.
>
> Can I have you ACK on this userspace stuff (patches 11-13)?
While the current "Source -> Target" based UI works well for many cases,
it'd be nice to have "-g -b any_call" to result in a callgraph like
output, so for userspace programs compiled without frame pointers, we
get a limited callgraph.
-Arun
prev parent reply other threads:[~2012-01-27 18:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-09 16:49 [PATCH 00/13] perf_events: add support for sampling taken branches (v3) Stephane Eranian
2012-01-09 16:49 ` [PATCH 01/13] perf_events: add generic taken branch sampling support (v3) Stephane Eranian
2012-01-27 4:46 ` Anshuman Khandual
2012-01-27 9:57 ` Stephane Eranian
2012-01-09 16:49 ` [PATCH 02/13] perf_events: add Intel LBR MSR definitions (v3) Stephane Eranian
2012-01-27 5:03 ` Anshuman Khandual
2012-01-09 16:49 ` [PATCH 03/13] perf_events: add Intel X86 LBR sharing logic (v3) Stephane Eranian
2012-01-09 16:49 ` [PATCH 04/13] perf_events: sync branch stack sampling with X86 precise_sampling (v3) Stephane Eranian
2012-01-27 5:26 ` Anshuman Khandual
2012-01-09 16:49 ` [PATCH 05/13] perf_events: add LBR mappings for PERF_SAMPLE_BRANCH filters (v3) Stephane Eranian
2012-01-27 5:41 ` Anshuman Khandual
2012-01-09 16:49 ` [PATCH 06/13] perf_events: disable LBR support for older Intel Atom processors (v3) Stephane Eranian
2012-01-27 5:43 ` Anshuman Khandual
2012-01-09 16:49 ` [PATCH 07/13] perf_events: implement PERF_SAMPLE_BRANCH for Intel X86 (v3) Stephane Eranian
2012-01-27 6:14 ` Anshuman Khandual
2012-01-09 16:49 ` [PATCH 08/13] perf_events: add LBR software filter support " Stephane Eranian
2012-01-09 16:49 ` [PATCH 09/13] perf_events: disable PERF_SAMPLE_BRANCH_* when not supported (v3) Stephane Eranian
2012-01-27 7:15 ` Anshuman Khandual
2012-01-27 9:56 ` Stephane Eranian
2012-01-09 16:49 ` [PATCH 10/13] perf_events: add hook to flush branch_stack on context switch (v3) Stephane Eranian
2012-01-09 16:49 ` [PATCH 11/13] perf: add code to support PERF_SAMPLE_BRANCH_STACK (v3) Stephane Eranian
2012-01-10 1:25 ` Arun Sharma
2012-01-10 15:43 ` Stephane Eranian
2012-01-09 16:49 ` [PATCH 12/13] perf: add support for sampling taken branch to perf record (v3) Stephane Eranian
2012-01-09 16:49 ` [PATCH 13/13] perf: add support for taken branch sampling to perf report (v3) Stephane Eranian
2012-01-23 10:14 ` [PATCH 00/13] perf_events: add support for sampling taken branches (v3) Stephane Eranian
2012-01-23 12:25 ` Peter Zijlstra
2012-01-23 15:07 ` Stephane Eranian
2012-01-23 15:47 ` Andi Kleen
2012-01-23 17:14 ` Stephane Eranian
2012-01-24 15:39 ` Stephane Eranian
2012-01-24 16:08 ` David Ahern
2012-01-24 17:42 ` Stephane Eranian
2012-01-26 16:21 ` Stephane Eranian
2012-01-27 12:09 ` Peter Zijlstra
2012-01-27 18:20 ` Arun Sharma [this message]
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