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SubjectRe: [PATCH 0/7] perf updates and fixes
On Fri, Mar 26, 2010 at 08:58:17AM +0100, Ingo Molnar wrote:
>
> * Paul Mackerras <paulus@samba.org> wrote:
>
> > On Fri, Mar 26, 2010 at 02:52:35AM +0100, Frederic Weisbecker wrote:
> >
> > > The series is not yet mergeable because it would break PowerPc (hot regs
> > > snapshot API has been changed, and I don't know how to update PowerPc for
> > > that).
> > >
> > > But if you're fine with the ideas, I can integrate the necessary changes
> > > to fix this, and also separate fixes and updates.
> >
> > The patch below adds the necessary stuff for powerpc. You could fold it
> > into your "perf: Move perf_arch_fetch_caller_regs into a macro" patch, or
> > keep it as a separate patch in the series (though that would make preserving
> > bisectability more difficult).
>
> Since the series needs a resend anyway folding back ought to be fine i think.
>
> I'm wondering whether this should get into tip:perf/urgent - or in
> tip:perf/core for 2.6.35.
>
> It fixes sw event call trace ugliness, but is that a 2.6.34 regression? Is
> there any other aspect of the series that points towards accelerating this
> into .34?


Let's have a look:

perf: Correctly align perf event tracing buffer

Should probably go into urgent. The change is not invasive at
all. It doesn't fix a regression but it's still an important fix.

The rest

It depends. The whole bunch is rather invasive.
The callchains of context switches never worked correctly
I think. I couldn't tell if the cpu migration has ever worked.
If it ever did, then it's a regression fix but in the middle of
too much hot regs improvements. So I can cook a specific fix for
the cpu migration event to work, and keep the rest for perf/core.



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