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

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Message-ID: <20191023143049.GS22919@krava>
Date:   Wed, 23 Oct 2019 16:30:49 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <ak@...ux.intel.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
Subject: Re: [PATCH v2 4/9] perf affinity: Add infrastructure to save/restore
 affinity

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?

jirka