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Message-ID: <20071003082157.GB32218@elte.hu>
Date: Wed, 3 Oct 2007 10:21:57 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Mel Gorman <mel@....ul.ie>
Cc: Bill Davidsen <davidsen@....com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
akpm@...ux-foundation.org
Subject: Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series..
* Mel Gorman <mel@....ul.ie> wrote:
> > > Nice one Ingo - got it first try. The problem commit was
> > > dd41f596cda0d7d6e4a8b139ffdfabcefdd46528 and it's clear that the
> > > code removed in this commit is put back by this latest patch.
> > > When applied, profile=sleep works as long as CONFIG_SCHEDSTAT is
> > > set.
> > >
> > And if it isn't set? I can easily see building a new kernel with
> > stats off and forgetting to change the boot options.
>
> If CONFIG_SCHEDSTAT is off and profile=sleep is set, you see with
> Ingo's patch and readprofile;
>
> 0 *unknown*
> 0 total 0.0000
>
> That is a tad confusing hence my follow-up patch which would say
> "/proc/profile" doesn't exist when readprofile is used and the warning
> in dmesg.
yep - that's the best we can do for the stable release.
We could improve quality of behavior here by not offering /proc/profile
in that case and by printk-ing something if profile=sleep is specified
on a !CONFIG_SCHEDSTATS kernel. I'm willing to apply patches that do
that :)
Ingo
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