linux-kernel - Re: [PATCH] perf_events: fix broken intr throttling (v3)

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Message-ID: <20120215023705.GA13042@us.ibm.com>
Date:	Tue, 14 Feb 2012 18:37:05 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Anton Blanchard <anton@...ba.org>,
	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	gleb@...hat.com, wcohen@...hat.com, vince@...ter.net,
	asharma@...com, andi@...stfloor.org, paulus@...ba.org,
	emunson@...bm.net, imunsie@....ibm.com,
	Matt Helsley <matthltc@...ibm.com>
Subject: Re: [PATCH] perf_events: fix broken intr throttling (v3)

Benjamin Herrenschmidt [benh@...nel.crashing.org] wrote:
| On Thu, 2012-02-09 at 19:19 -0800, Sukadev Bhattiprolu wrote:
| > Stephane Eranian [eranian@...gle.com] wrote:
| > | On Wed, Feb 8, 2012 at 12:32 PM, Anton Blanchard <anton@...ba.org> wrote:
| > | >
| > | > Hi,
| > | >
| > | > On Thu, 26 Jan 2012 17:03:19 +0100
| The powerpc .git tree is not useful at this point, I haven't opened
| powerpc -next yet so it's just all old stale stuff. Please work with
| upstream always unless you have a very good reason to use my tree. It's
| really only meant as a conduit between me and Linus or for -next.

Ok.

I tried this on current mainline (commit 13d261932) which now includes both
of Stephane's patches and repeated the nooploop test.

The problem still exists - the number of events reported on Power is far
fewer than without the patches.

Aggregated stats:
           TOTAL events:         78
            MMAP events:         47
            COMM events:          2
            EXIT events:          2
          SAMPLE events:         27
cycles stats:
           TOTAL events:         21
            MMAP events:          4
            COMM events:          1
            EXIT events:          2
          SAMPLE events:         14
cycles stats:
           TOTAL events:         13
          SAMPLE events:         13

Sukadev

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