linux-kernel - Re: [RFC][PATCH 1/4] perf: core, add group scheduling transactional APIs

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Message-ID: <1271924699.1776.316.camel@laptop>
Date:	Thu, 22 Apr 2010 10:24:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	arjan@...ux.intel.com,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/4] perf: core, add group scheduling
 transactional APIs

On Thu, 2010-04-22 at 15:51 +0800, Lin Ming wrote:
> +       if (pmu->commit_txn) {
> +               ret = pmu->commit_txn(pmu);
> +               if (!ret) {
> +                       if (pmu->stop_txn)
> +                               pmu->stop_txn(pmu);
> +
> +                       return 0;
> +               }
> +       } 

I think we can mandate that if one of the _txn methods is available,
they all are, it would be weird otherwise.

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