linux-kernel - Re: [Patch] mm tracepoints

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: <1236367320.1476.82.camel@dhcp-100-19-198.bos.redhat.com>
Date:	Fri, 06 Mar 2009 14:22:00 -0500
From:	Larry Woodman <lwoodman@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	fweisbec@...il.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [Patch] mm tracepoints

On Fri, 2009-03-06 at 18:10 +0100, Ingo Molnar wrote:
> * Larry Woodman <lwoodman@...hat.com> wrote:
> 
> > > Would that be useless or controversial? We know from 
> > > vma->mapping which inode it maps to. Knowing which file is 
> > > faulting in can be useful - especially when addresses are a 
> > > moving target such as under PIE or with dlopen(), etc.
> > > 
> > > 	Ingo
> > 
> > Attached is the updated patch that applies and builds 
> > correctly (sorry I missed the lockdep tracepoints that were 
> > added at the last minute). [...]
> 
> Looks pretty good and useful to me. I've Cc:-ed more mm folks, 
> it would be nice to hear their opinion about these tracepoints.
> 
> Andrew, Nick, Peter, what do you think?
> 
> About the motivation of these tracepoints: i suspect these 
> tracepoints reflect your years-long experience in dealing with 
> various MM regressions in the enterprise space and these 
> tracepoints would help understand such regressions 
> faster/easier?

Exactly, and without running some "debug enhanced kernel".

> 
> > [...]  As far as the filename:offset is concerned I am working 
> > on that.  Its not as simple as it looks because we have to 
> > follow a variable list of structs that can be null terminated 
> > several places along the way.
> 
> It's definitely not simple! I dont think it should be in this 
> base patch at all - it should be an add-on.
> 
> 	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/