From: Jiri Olsa <jolsa@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: acme@kernel.org, jolsa@kernel.org, eranian@google.com,
linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH v3 3/7] perf evsel: Add iterator to iterate over events ordered by CPU
Date: Wed, 30 Oct 2019 19:15:52 +0100 [thread overview]
Message-ID: <20191030181552.GM20826@krava> (raw)
In-Reply-To: <20191030155108.taqo2kbuaro3idhe@two.firstfloor.org>
On Wed, Oct 30, 2019 at 08:51:08AM -0700, Andi Kleen wrote:
> On Wed, Oct 30, 2019 at 11:06:06AM +0100, Jiri Olsa wrote:
> > > +struct perf_cpu_map *evlist__cpu_iter_start(struct evlist *evlist)
> > > +{
> > > + struct perf_cpu_map *cpus;
> > > + struct evsel *pos;
> > > +
> > > + /*
> > > + * evlist->cpus is not necessarily a superset of all the
> > > + * event's cpus, so compute our own super set. This
> > > + * assume that there is a super set
> > > + */
> > > + cpus = evlist->core.cpus;
> > > + evlist__for_each_entry(evlist, pos) {
> > > + pos->cpu_index = 0;
> > > + if (pos->core.cpus->nr > cpus->nr)
> > > + cpus = pos->core.cpus;
> > > + }
> > > + return cpus;
> >
> > I might not understand the reason for cpu_index, but
>
> This is just so that we can iterate each event's map
> independently.
>
> > imagine something like below should be enough, no?
>
> Well it's more complicated because evlist->all_cpus doesn't exist.
yes, I suggest to create it
> The exists evlist->cpus cannot be used (I tried that)
> I also don't think we have an existing function to merge
> two maps, so that would need to be added to create it.
> Just using ->cpu_index is a much simpler change.
I dont think that would be lot of code
and it would simplify this one
jirka
next prev parent reply other threads:[~2019-10-30 18:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-25 18:14 Optimize perf stat for large number of events/cpus v3 Andi Kleen
2019-10-25 18:14 ` [PATCH v3 1/7] perf pmu: Use file system cache to optimize sysfs access Andi Kleen
2019-10-28 22:01 ` Jiri Olsa
2019-10-29 2:14 ` Andi Kleen
2019-10-25 18:14 ` [PATCH v3 2/7] perf affinity: Add infrastructure to save/restore affinity Andi Kleen
2019-10-25 18:14 ` [PATCH v3 3/7] perf evsel: Add iterator to iterate over events ordered by CPU Andi Kleen
2019-10-30 10:05 ` Jiri Olsa
2019-10-30 10:06 ` Jiri Olsa
2019-10-30 15:51 ` Andi Kleen
2019-10-30 18:15 ` Jiri Olsa [this message]
2019-10-30 19:03 ` Andi Kleen
2019-11-01 8:38 ` Jiri Olsa
2019-10-25 18:14 ` [PATCH v3 4/7] perf stat: Use affinity for closing file descriptors Andi Kleen
2019-10-30 10:05 ` Jiri Olsa
2019-11-04 23:35 ` Andi Kleen
2019-10-25 18:14 ` [PATCH v3 5/7] perf stat: Use affinity for opening events Andi Kleen
2019-10-30 10:06 ` Jiri Olsa
2019-10-25 18:14 ` [PATCH v3 6/7] perf stat: Use affinity for reading Andi Kleen
2019-10-25 18:14 ` [PATCH v3 7/7] perf stat: Use affinity for enabling/disabling events Andi Kleen
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