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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4F22EAFD.1020006@fb.com \
--to=asharma@fb.com \
--cc=acme@infradead.org \
--cc=andi@firstfloor.org \
--cc=eranian@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ming.m.lin@intel.com \
--cc=mingo@elte.hu \
--cc=peterz@infradead.org \
--cc=ravitillo@lbl.gov \
--cc=robert.richter@amd.com \
--cc=vweaver1@eecs.utk.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.