From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org, mingo@elte.hu, paulus@samba.org,
acme@redhat.com
Subject: Re: [PATCH RFC] perf: fix find_swevent_head() RCU lockdep splat
Date: Thu, 20 May 2010 09:04:06 +0200 [thread overview]
Message-ID: <20100520070403.GB5309@nowhere> (raw)
In-Reply-To: <1273823225.5605.3604.camel@twins>
On Fri, May 14, 2010 at 09:47:05AM +0200, Peter Zijlstra wrote:
> On Thu, 2010-05-13 at 22:48 +0200, Frederic Weisbecker wrote:
> > + head = find_swevent_head(cpuctx, event->attr.type,
> > + event->attr.config, event);
>
> might as well only pass event and have the function do those derefs.
Yeah, why not. But now that I see we can optimize the scheduling
side with rcu_dereference_protected, it's probably better to keep
the two derefs protected.
next prev parent reply other threads:[~2010-05-20 7:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-13 18:25 [PATCH RFC] perf: fix find_swevent_head() RCU lockdep splat Paul E. McKenney
2010-05-13 19:03 ` Frederic Weisbecker
2010-05-13 19:46 ` Paul E. McKenney
2010-05-13 20:26 ` Frederic Weisbecker
2010-05-13 20:48 ` Frederic Weisbecker
2010-05-13 20:59 ` Frederic Weisbecker
2010-05-13 23:43 ` Paul E. McKenney
2010-05-20 7:01 ` Frederic Weisbecker
2010-05-14 7:47 ` Peter Zijlstra
2010-05-20 7:04 ` Frederic Weisbecker [this message]
2010-05-14 7:44 ` Peter Zijlstra
2010-05-20 7:04 ` Frederic Weisbecker
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