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SubjectRe: [PATCH] x86: add the debugfs interface for the sysprof tool
On Sat, 23 Feb 2008 16:54:49 +0200 "Pekka Enberg" <penberg@cs.helsinki.fi> wrote:

> On Sat, Feb 23, 2008 at 10:11 AM, Andrew Morton
> <akpm@linux-foundation.org> wrote:
> > Seems a poor idea to me. Sure, oprofile is "hard to set up", but not if
> > your distributor already did it for you.
> >
> > Sidebar: the code uses the utterly crappy register_timer_hook() which
> >
> > a) is woefully misnamed and
> >
> > b) is racy and
> >
> > c) will disrupt oprofile if it is being used. And vice versa.
>
> I wonder if sysprof should hook to the same interrupt as oprofile then?

oprofile uses register_timer_hook() for its oh-crap-nothing-else-works
fallback iirc. It's a useful fallback: I used it a few centuries ago on
some el-cheapo VIA CPU-based thing we had at Digeo.

It's unclear to me whether all this stuff works with NO_HZ=y, btw. Didn't
we just lose the regular timer interrupts which these clients depend upon?



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