linux-kernel - Re: [patch 0/4] perf_counter tools: support annotation of live kernel modules

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: <20090703072400.GA7943@elte.hu>
Date:	Fri, 3 Jul 2009 09:24:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/4] perf_counter tools: support annotation of live
	kernel modules


* Mike Galbraith <efault@....de> wrote:

> On Thu, 2009-07-02 at 14:10 +0200, Peter Zijlstra wrote:
> > On Thu, 2009-07-02 at 09:17 +0200, Mike Galbraith wrote:
> > 
> > >  I've been pondering a perf archive tool
> > > that would package everything that's needed to do analysis on a
> > > different box.  One big problem though, is that while you can easily
> > > package vmlinux and modules, what about all the userland binaries?  A
> > > large perf.data and/or debug info binaries can easily make transport
> > > impractical enough.
> > 
> > I would simply extend the current file header with another section in
> > which we do a structured storage of the data structures we currently
> > build in perf-report. That is, the dso and symbol bits.
> > 
> > If we then run perf-report on a file containing such a section we read
> > that data instead of trying to locate them the regular way.
> 
> That's a good idea.
> 
> If uname doesn't match stored record time uname, you're not live, 
> so tools require an exportable perf.data.  If you're not live and 
> not on the same host, annotate requires binaries appended via an 
> export tool with --sym-filter -k -u -% whatever capability.

'perf export' could be a nice shortcut to convert a local perf.data 
into a off-line analysable body of data.

	Ingo
--
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/