linux-kernel - Re: [RFC] perf_events: support for uncore a.k.a. nest units

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Message-Id: <1271889502.7414.14.camel@localhost>
Date:	Wed, 21 Apr 2010 22:38:22 +0000
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] perf_events: support for uncore a.k.a. nest units

On Wed, 2010-04-21 at 22:22 +0800, Peter Zijlstra wrote:
> On Wed, 2010-04-21 at 22:12 +0000, Lin Ming wrote:
> > +       ret = pmu->commit_txn(pmu);
> > +       if (!ret) {
> > +               pmu->stop_txn(pmu);
> > +               return 0;
> > +       }
> >  
> >  group_error:
> > +       pmu->stop_txn(pmu); 
> 
> If you let commit_txn() also clear the state you can save some logic and
> a method.

I add this ->stop_txn(pmu) because the rollback code also need to clear
the state.

> 
> But yes, this looks good. If you don't remove the weak interface just
> yet, you can do a patch per architecture that uses this (at least
> powerpc and sparc do), and remove the weak thing at the end once all
> users are gone.
> 

OK, I'll do that for powerpc and sparc.

And need to check if there are transaction methods in group_sched_in for
other arch, as below.

group_sched_in(...)
{
	if (pmu->start_txn)
		pmu->start_txn(pmu);

	if (pmu->commit_txn)
		pmu->commit_txn(pmu)
}

Thanks,
Lin Ming

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