From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: "'Nick Piggin'" <nickpiggin@yahoo.com.au>,
"Con Kolivas" <kernel@kolivas.org>
Cc: <linux-kernel@vger.kernel.org>, "'Chris Mason'" <mason@suse.com>,
"Ingo Molnar" <mingo@elte.hu>
Subject: RE: [PATCH RFC] smt nice introduces significant lock contention
Date: Fri, 2 Jun 2006 01:34:50 -0700 [thread overview]
Message-ID: <000201c6861f$6a2d4e20$0b4ce984@amr.corp.intel.com> (raw)
In-Reply-To: <447FF6B8.1000700@yahoo.com.au>
Nick Piggin wrote on Friday, June 02, 2006 1:29 AM
> Con Kolivas wrote:
> > On Friday 02 June 2006 17:53, Nick Piggin wrote:
> >
> >>This is a small micro-optimisation / cleanup we can do after
> >>smtnice gets converted to use trylocks. Might result in a little
> >>less cacheline footprint in some cases.
> >
> >
> > It's only dependent_sleeper that is being converted in these patches. The
> > wake_sleeping_dependent component still locks all runqueues and needs to
>
> Oh I missed that.
>
> > succeed in order to ensure a task doesn't keep sleeping indefinitely. That
>
> Let's make it use trylocks as well. wake_priority_sleeper should ensure
> things don't sleep forever I think? We should be optimising for the most
> common case, and in many workloads, the runqueue does go idle frequently.
>
Ha, you beat me by one minute. It did cross my mind to use try lock there as
well, take a look at my version, I think I have a better inner loop.
- Ken
next prev parent reply other threads:[~2006-06-02 8:35 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-01 22:55 Chris Mason
2006-06-01 23:57 ` Chen, Kenneth W
2006-06-02 1:59 ` Con Kolivas
2006-06-02 2:28 ` Con Kolivas
2006-06-02 3:55 ` Con Kolivas
2006-06-02 4:18 ` Nick Piggin
2006-06-02 6:08 ` Con Kolivas
2006-06-02 7:53 ` Nick Piggin
2006-06-02 8:17 ` Con Kolivas
2006-06-02 8:28 ` Nick Piggin
2006-06-02 8:34 ` Chen, Kenneth W [this message]
2006-06-02 8:56 ` Nick Piggin
2006-06-02 9:17 ` Chen, Kenneth W
2006-06-02 9:25 ` Con Kolivas
2006-06-02 9:31 ` Chen, Kenneth W
2006-06-02 9:34 ` Con Kolivas
2006-06-02 9:53 ` Chen, Kenneth W
2006-06-02 10:12 ` Con Kolivas
2006-06-02 20:53 ` Chen, Kenneth W
2006-06-02 22:15 ` Con Kolivas
2006-06-02 22:19 ` Chen, Kenneth W
2006-06-02 22:31 ` Con Kolivas
2006-06-02 22:58 ` Chen, Kenneth W
2006-06-03 0:02 ` Con Kolivas
2006-06-03 0:08 ` Chen, Kenneth W
2006-06-03 0:27 ` Con Kolivas
2006-06-02 9:36 ` Chen, Kenneth W
2006-06-02 10:30 ` Con Kolivas
2006-06-02 13:16 ` Con Kolivas
2006-06-02 21:54 ` Chen, Kenneth W
2006-06-02 22:04 ` Con Kolivas
2006-06-02 22:14 ` Chen, Kenneth W
2006-06-02 10:19 ` Con Kolivas
2006-06-02 20:59 ` Chen, Kenneth W
2006-06-02 8:38 ` Chen, Kenneth W
2006-06-02 8:24 ` Chen, Kenneth W
2006-06-02 8:31 ` Chen, Kenneth W
2006-06-02 8:50 ` Chen, Kenneth W
2006-06-02 2:35 ` Chen, Kenneth W
2006-06-02 3:04 ` Con Kolivas
2006-06-02 3:23 ` Con Kolivas
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