linux-kernel - Re: [PATCH v2 4/9] perf affinity: Add infrastructure to save/restore affinity

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Date:   Wed, 23 Oct 2019 07:52:06 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>, acme@...nel.org,
        linux-kernel@...r.kernel.org, jolsa@...nel.org, eranian@...gle.com,
        kan.liang@...ux.intel.com, peterz@...radead.org,
        alexey.budankov@...ux.intel.com
Subject: Re: [PATCH v2 4/9] perf affinity: Add infrastructure to save/restore
 affinity

On Wed, Oct 23, 2019 at 04:30:49PM +0200, Jiri Olsa wrote:
> On Wed, Oct 23, 2019 at 06:02:35AM -0700, Andi Kleen wrote:
> > On Wed, Oct 23, 2019 at 11:59:11AM +0200, Jiri Olsa wrote:
> > > On Sun, Oct 20, 2019 at 10:51:57AM -0700, Andi Kleen wrote:
> > > 
> > > SNIP
> > > 
> > > > +}
> > > > diff --git a/tools/perf/util/affinity.h b/tools/perf/util/affinity.h
> > > > new file mode 100644
> > > > index 000000000000..e56148607e33
> > > > --- /dev/null
> > > > +++ b/tools/perf/util/affinity.h
> > > > @@ -0,0 +1,15 @@
> > > > +// SPDX-License-Identifier: GPL-2.0
> > > > +#ifndef AFFINITY_H
> > > > +#define AFFINITY_H 1
> > > > +
> > > > +struct affinity {
> > > > +	unsigned char *orig_cpus;
> > > > +	unsigned char *sched_cpus;
> > > 
> > > why not use cpu_set_t directly?
> > 
> > Because it's too small in glibc (only 1024 CPUs) and perf already 
> > supports more.
> 
> nice, we're using it all over the place.. how about using bitmap_alloc?

Okay.

The other places is mainly perf record from Alexey's recent affinity changes.
These probably need to be fixed.

+Alexey

And some stuff in bench/*. That's more nice to have.

-Andi