linux-kernel - Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4D909BBB.5020500@gmail.com>
Date:	Mon, 28 Mar 2011 08:31:23 -0600
From:	David Ahern <dsahern@...il.com>
To:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
CC:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	2nddept-manager@....hitachi.co.jp,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

On 03/28/11 04:34, Akihiro Nagai wrote:
>> from is sample->ip? to is sample->addr? In the above example
>> 0x39d3015260 is the value from sample->addr, 1526f is sample->ip which
>> resolves to _dl_next_ld_env_entry from /lib64/ld-2.13.so.
> Yes.
> In this example, resolved address is only sample->ip (branch from).
> We need the resolved address of sample->addr (branch to) too, because
> both of them are addresses of execution code.

Ok, now I understand. In that case add conversion of sample->addr to
symbols to perf-script.

>>
>>>
>>> Can perf-script do it by writing scripts?
>>
>> If you are pulling the data from a perf sample then you can accomplish
>> the same goal within perf-script.
> It seems that perf-script doesn't have the interface of converting
> sample->addr to symbol, pid, comm and others. Of course, we can add
> the interface to perf-script, and it could be another way to implement
> this function using perf-script.
> However, since BTS output usually becomes huge, it would be very slow
> to convert all the data by python/perl.

Custom fields are not run through python/perl; they are generated from
C-code. Take a look at tools/perf/builtin-script.c
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/