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From: Andi Kleen <andi@firstfloor.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>,
	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 12:03:28 -0700	[thread overview]
Message-ID: <20191030190328.fhsv7e2fqqvfpsit@two.firstfloor.org> (raw)
In-Reply-To: <20191030181552.GM20826@krava>

> 
> > 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

AFAIK they're not guaranteed to be sorted, which makes merging
complicated. I'm not sure it's safe to just sort existing maps
because someone might have a index.

So you'll need to create temporary maps, sort them and then 
merge. Won't be simple.

-Andi

  reply	other threads:[~2019-10-30 19:03 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
2019-10-30 19:03         ` Andi Kleen [this message]
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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