linux-kernel - Re: [Patch] mm tracepoints

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Message-ID: <20090306182419.GA28631@elte.hu>
Date:	Fri, 6 Mar 2009 19:24:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Larry Woodman <lwoodman@...hat.com>,
	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, fweisbec@...il.com
Subject: Re: [Patch] mm tracepoints


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Fri, 2009-03-06 at 19:01 +0100, Ingo Molnar wrote:
> > * Peter Zijlstra <peterz@...radead.org> wrote:
> > 
> > > On Fri, 2009-03-06 at 18:38 +0100, Peter Zijlstra wrote:
> > > > On Fri, 2009-03-06 at 18:10 +0100, Ingo Molnar wrote:
> > > > > 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?
> > > > 
> > > > Bit sad we use the struct mm_struct * as mm identifier (little %lx vs %p
> > > > confusion there too), but I suppose there simply isn't anything better.
> > > 
> > > > Things missing, 
> > > 
> > > Why only anon and filemap, that misses out on all the funky 
> > > driver ->fault() handlers.
> > 
> > btw., does it include shm faults? I think all of this would 
> > be handled if the tracepoint was at handle_mm_fault(), 
> > right?
> 
> Partially, you wouldn't be able to do the file:offset thing 
> you asked for.

That could be done further down in filemap_fault(). I.e. have an 
all-encompassing tracepoint for all things [user-] page faults, 
and a few opt-in places for more interesting specific fault 
types.

> But yeah, also hugetlb seems to be missing.

Probably not that huge of an issue, given how rare those faults 
are ;-)

	Ingo
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