lkml.org 
[lkml]   [2008]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH [RT] 10/14] adjust pi_lock usage in wakeup

On Thu, 21 Feb 2008, Gregory Haskins wrote:

> From: Peter W.Morreale <pmorreale@novell.com>
>
> In wakeup_next_waiter(), we take the pi_lock, and then find out whether
> we have another waiter to add to the pending owner. We can reduce
> contention on the pi_lock for the pending owner if we first obtain the
> pointer to the next waiter outside of the pi_lock.
>
> This patch adds a measureable increase in throughput.

I see how this may decrease contention (slightly less time in holding the
pi_lock). But, please, when stating something like: "adds a measurable
increase in throughput", show the benchmark numbers.

-- Steve



\
 
 \ /
  Last update: 2008-02-21 17:51    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site