linux-kernel - Re: [PATCH 13/21] perf, c2c: Add callchain support

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: <20140219025400.GO25953@redhat.com>
Date:	Tue, 18 Feb 2014 21:54:00 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...stprotocols.net, LKML <linux-kernel@...r.kernel.org>,
	jmario@...hat.com, fowles@...each.com, eranian@...gle.com
Subject: Re: [PATCH 13/21] perf, c2c: Add callchain support

On Tue, Feb 18, 2014 at 02:07:31PM +0100, Jiri Olsa wrote:
> On Mon, Feb 10, 2014 at 12:29:08PM -0500, Don Zickus wrote:
> > Seeing cacheline statistics is useful by itself.  Seeing the callchain
> > for these cache contentions saves time tracking things down.
> > 
> > This patch tries to add callchain support.  I had to use the generic
> > interface from a previous patch to output things to stdout easily.
> > 
> > Other than the displaying the results, collecting the callchain and
> > merging it was fairly straightforward.
> > 
> > I used a lot of copying-n-pasting from other builtin tools to get
> > the intial parameter setup correctly and the automatic reading of
> > 'symbol_conf.use_callchain' from the data file.
> > 
> > Hopefully this is all correct.  The amount of memory corruption (from the
> > callchain dynamic array) seems to have dwindled done to nothing. :-)
> 
> hum.. report command already has all this.. if we could go the
> hist_entry way, there'd be no need to reiplement this

Sure.  I will look into the hist_entry.  It would also be nice if the
callchain support had a better api so those commands that can't hook in
through hist_entry had a simpler way to utilize callchains. :-)

Cheers,
Don
--
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/