lkml.org 
[lkml]   [2005]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2.6.13] lockless pagecache 7/7
Christoph Lameter wrote:
> For Itanium (and I guess also for ppc64 and sparch64) the performance of
> write_lock/unlock is the same as spin_lock/unlock. There is at least
> one case where concurrent reads would be allowed without this patch.
>

Yep, I picked up another one that was easy to make lockless (I'll send
out a new patchset soon), however the tagged lookup that was under read
lock is changed to a spin lock.

It shouldn't be too difficult to make the tag lookups (find_get_pages_tag)
lockless, however I just haven't gotten around to looking at the write
side of the tagging yet.

When that is done, there should be no more read locks at all.

Nick

--
SUSE Labs, Novell Inc.

Send instant messages to your online friends http://au.messenger.yahoo.com

-
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: 2005-09-09 17:28    [W:0.095 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site