From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Stephane Eranian <eranian@google.com>,
linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Peter Zijlstra <peterz@infradead.org>,
Jiri Olsa <jolsa@redhat.com>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2 00/16] perf: add memory access sampling support
Date: Wed, 07 Nov 2012 16:38:36 +0900 [thread overview]
Message-ID: <87fw4looar.fsf@sejong.aot.lge.com> (raw)
In-Reply-To: <20121106205220.GF13629@infradead.org> (Arnaldo Carvalho de Melo's message of "Tue, 6 Nov 2012 17:52:21 -0300")
Hi Arnaldo,
On Tue, 6 Nov 2012 17:52:21 -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Nov 05, 2012 at 02:50:47PM +0100, Stephane Eranian escreveu:
> [root@sandy acme]# perf mem -t load rep --stdio --sort=symbol,symbol_daddr,cost
> # Samples: 30 of event 'cpu/mem-loads/pp'
> # Total cost : 640
> # Sort order : symbol,symbol_daddr,cost
> #
> # Overhead Samples Symbol Data Symbol Cost
> # ........ ........... ...................... ...................... .......
> #
> 55.00% 1 [k] lookup_fast [k] 0xffff8803b7521bd4 352
> 5.47% 1 [k] cache_alloc_refill [k] 0xffff880407705024 35
> 3.44% 1 [k] cache_alloc_refill [k] 0xffff88041d8527d8 22
> 3.28% 1 [k] run_timer_softirq [k] 0xffff88041e2c3e90 21
> 2.50% 1 [k] __list_add [k] 0xffff8803b7521d68 16
> 2.19% 1 [.] __strcoll_l [.] 0x00007fffa8d44080 14
> 1.88% 1 [.] __strcoll_l [.] 0x00007fffa8d44104 12
>
> If we go to the annotation browser to see where is that lookup_fast hitting we get:
>
> 100.00 │ mov -0x34(%rbp),%eax
>
> How to map 0xffff8803b7521bd4 to a stack variable, struct members and all?
>
> Humm, for userspace we have PERF_SAMPLE_REGS_USER for the dwarf unwinder we
> need for userspace, but what about reverse mapping of kernel variables? Jiri?
I suspect there aren't much thing we can do on stack. One thing we can
do is adding dso_daddr to sort key and seeing it's a [stack] (or
[stack:tid]) or not. But not sure it can be done for kernel stacks too.
Thanks,
Namhyung
next prev parent reply other threads:[~2012-11-07 7:38 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-05 13:50 [PATCH v2 00/16] perf: add memory access sampling support Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 01/16] perf/x86: improve sysfs event mapping with event string Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 02/16] perf/x86: add flags to event constraints Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 03/16] perf, core: Add a concept of a weightened sample Stephane Eranian
2012-11-05 20:01 ` Arnaldo Carvalho de Melo
2012-11-05 20:07 ` Arnaldo Carvalho de Melo
2012-11-05 22:51 ` Andi Kleen
2012-11-05 13:50 ` [PATCH v2 04/16] perf: add minimal support for PERF_SAMPLE_WEIGHT Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 05/16] perf, tools: Add arbitary aliases and support names with - Stephane Eranian
2012-11-14 7:34 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2012-11-05 13:50 ` [PATCH v2 06/16] perf: add support for PERF_SAMPLE_ADDR in dump_sampple() Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 07/16] perf: add generic memory sampling interface Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 08/16] perf/x86: add memory profiling via PEBS Load Latency Stephane Eranian
2012-11-06 13:31 ` Andi Kleen
2012-11-06 14:29 ` Stephane Eranian
2012-11-06 18:50 ` Andi Kleen
2012-11-06 19:37 ` Stephane Eranian
2012-11-07 14:39 ` Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 09/16] perf/x86: export PEBS load latency threshold register to sysfs Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 10/16] perf/x86: add support for PEBS Precise Store Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 11/16] perf tools: add mem access sampling core support Stephane Eranian
2012-11-05 13:50 ` [PATCH v2 12/16] perf report: add support for mem access profiling Stephane Eranian
2012-11-05 13:51 ` [PATCH v2 13/16] perf record: " Stephane Eranian
2012-11-05 13:51 ` [PATCH v2 14/16] perf tools: add new mem command for memory " Stephane Eranian
2012-11-06 15:44 ` Arnaldo Carvalho de Melo
2012-11-06 15:49 ` Stephane Eranian
2012-11-06 16:51 ` Arnaldo Carvalho de Melo
2012-11-06 17:05 ` Arnaldo Carvalho de Melo
2012-11-06 15:50 ` Arnaldo Carvalho de Melo
2012-11-06 15:57 ` Stephane Eranian
2012-11-06 17:07 ` Arnaldo Carvalho de Melo
2012-11-05 13:51 ` [PATCH v2 15/16] perf: add PERF_RECORD_MISC_MMAP_DATA to RECORD_MMAP Stephane Eranian
2012-11-05 13:51 ` [PATCH v2 16/16] perf tools: detect data vs. text mappings Stephane Eranian
2012-11-06 20:52 ` [PATCH v2 00/16] perf: add memory access sampling support Arnaldo Carvalho de Melo
2012-11-07 7:38 ` Namhyung Kim [this message]
2012-11-07 10:02 ` Stephane Eranian
2012-11-07 14:53 ` Masami Hiramatsu
2012-11-07 14:56 ` Stephane Eranian
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