* Mel Gorman <[email protected]> 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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