linux-kernel - Re: [PATCH 15/15] perf, tools: Add perf stat --transaction v3

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Date:	Wed, 19 Jun 2013 16:46:21 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu, acme@...hat.com,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 15/15] perf, tools: Add perf stat --transaction v3

> This hard coded list isn't going to work for us on powerpc.
> 
> We don't have HLE, so we won't ever have an event for el-start.
> 
> I don't quite grok what the cycles-ct is about, checkpointed cycles?

The counter is check pointed on a transaction start, and set back to
the checkpoint when an abort happens. This allows to count the cycles
wasted in aborts, when you subtract from cycles-t.

> But I don't think we have anything equivalent.

But you have cycles-t and tx-start?

I can make el-start, cycles-ct optional

> I guess the simplest option is to make it a per-arch list inside the
> perf tool?

I'm not sure that would be acceptable to the perf maintainers.
Although I'm just guessing, I haven't heard any comments on
this patch recently.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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