netdev - Re: fanotify as syscalls

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Message-ID: <20090917193543.5f88e2b1@infradead.org>
Date:	Thu, 17 Sep 2009 19:35:43 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jamie Lokier <jamie@...reable.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Eric Paris <eparis@...hat.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	netdev@...r.kernel.org, viro@...iv.linux.org.uk,
	alan@...ux.intel.com, hch@...radead.org
Subject: Re: fanotify as syscalls

On Thu, 17 Sep 2009 09:40:16 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> And then we have page faults. I've long wished that from a system
> call tracing standpoint we could show page faults as
> pseudo-system-calls (at least as long as they happen from user space
> - trying to handle nesting is not worth it). It would make it _so_
> much more obvious what the performance patterns are if you could just
> do
> 
> 	strace -ttT firefox
> 
> for the cold-cache case and you'd see where the time is really spent.
> 
> (yeah, yeah, you can get that kind of information other ways, but
> it's a hell of a lot less convenient than just getting a nice trace
> with timestamps).

ohhh I should add pagefaults to timechart
good one.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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