lkml.org 
[lkml]   [2006]   [Aug]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Why Semaphore Hardware-Dependent?
Date
Andi Kleen <ak@suse.de> wrote:

> BTW maybe it would be a good idea to switch the wait list to a hlist,
> then the last user in the queue wouldn't need to
> touch the cache line of the head. Or maybe even a single linked
> list then some more cache bounces might be avoidable.

You need a list_head to get O(1) push at one end and O(1) pop at the other.
In addition a singly-linked list makes interruptible ops non-O(1) also.

David
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-08-29 20:33    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site