linux-kernel - Re: [PATCH perf/core 0/6] perf-probe: Bugfix and add new options for cache

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Message-ID: <87lhnqw543.fsf@sejong.aot.lge.com>
Date:	Wed, 05 Nov 2014 15:09:32 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	srikar@...ux.vnet.ibm.com, Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Brendan Gregg <brendan.gregg@...il.com>,
	yrl.pp-manager.tt@...achi.com,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core 0/6] perf-probe: Bugfix and add new options for cache

Hi Masami,

On Tue, 04 Nov 2014 14:44:28 +0900, Masami Hiramatsu wrote:
> (2014/11/04 12:14), Namhyung Kim wrote:
>> Hi Masami,
>> 
>> On Fri, 31 Oct 2014 14:51:29 -0400, Masami Hiramatsu wrote:
>>> So by using all of them, we can make an "event cache" file on all
>>> functions (except for inlined functions) as below.
>>>
>>>   # perf probe --max-probes=100000 --no-inlines -a '* $params' -o event.cache
>>>
>>> builds "event.cache" file in which event settings for
>>> all function entries, like below;
>>>
>>>   p:probe/reset_early_page_tables _text+12980741
>>>   p:probe/copy_bootdata _text+12980830 real_mode_data=%di:u64
>>>   p:probe/exit_amd_microcode _text+14692680
>>>   p:probe/early_make_pgtable _text+12981274 address=%di:u64
>>>   p:probe/x86_64_start_reservations _text+12981700 real_mode_data=%di:u64
>>>   p:probe/x86_64_start_kernel _text+12981744 real_mode_data=%di:u64
>>>   p:probe/reserve_ebda_region _text+12982117
>> 
>> Does this event cache support kernel modules too?  AFAIK it can have a
>> different address whenever loaded even on a same kernel.
>
> Yes, for the modules perf probe uses target function symbol directly instead
> of _text.
>
>  ----
>  perf probe -m xfs -o - -q -a xfs_acl_exists
>  p:probe/xfs_acl_exists xfs:xfs_acl_exists+0
>  ----

Ah, great! :)

Thanks,
Namhyung
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