From: mel@skynet.ie (Mel Gorman)
To: Christoph Lameter <clameter@sgi.com>
Cc: Lee.Schermerhorn@hp.com, ak@suse.de,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 4/6] Record how many zones can be safely skipped in the zonelist
Date: Tue, 21 Aug 2007 09:58:53 +0100 [thread overview]
Message-ID: <20070821085853.GD29794@skynet.ie> (raw)
In-Reply-To: <Pine.LNX.4.64.0708171402540.9635@schroedinger.engr.sgi.com>
On (17/08/07 14:03), Christoph Lameter didst pronounce:
> Is there any performance improvement because of this patch? It looks
> like processing got more expensive since an additional cacheline needs to
> be fetches to get the skip factor.
>
It's a small gain on a few machines. Where I thought it was more likely
to be a win is on x86-64 NUMA machines particularly if the zonelist
ordering was zone order as there would be potentially many nodes to
skip.
Kernbench didn't show up any regressions for the other machines but the
userspace portion of that workload is unlikely to notice the loss of a
cache line.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2007-08-21 8:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-17 20:16 [PATCH 0/6] Use one zonelist per node instead of multiple zonelists v4 Mel Gorman
2007-08-17 20:17 ` [PATCH 1/6] Use zonelists instead of zones when direct reclaiming pages Mel Gorman
2007-08-17 20:17 ` [PATCH 2/6] Use one zonelist that is filtered instead of multiple zonelists Mel Gorman
2007-08-17 20:59 ` Christoph Lameter
2007-08-21 8:51 ` Mel Gorman
2007-08-17 20:17 ` [PATCH 3/6] Embed zone_id information within the zonelist->zones pointer Mel Gorman
2007-08-17 21:02 ` Christoph Lameter
2007-08-21 8:54 ` Mel Gorman
2007-08-17 20:18 ` [PATCH 4/6] Record how many zones can be safely skipped in the zonelist Mel Gorman
2007-08-17 21:03 ` Christoph Lameter
2007-08-21 8:58 ` Mel Gorman [this message]
2007-08-17 20:18 ` [PATCH 5/6] Filter based on a nodemask as well as a gfp_mask Mel Gorman
2007-08-17 21:29 ` Christoph Lameter
2007-08-21 9:12 ` Mel Gorman
2007-08-17 20:18 ` [PATCH 6/6] Do not use FASTCALL for __alloc_pages_nodemask() Mel Gorman
2007-08-17 21:07 ` Christoph Lameter
2007-08-18 12:51 ` Andi Kleen
2007-08-21 10:25 ` Mel Gorman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070821085853.GD29794@skynet.ie \
--to=mel@skynet.ie \
--cc=Lee.Schermerhorn@hp.com \
--cc=ak@suse.de \
--cc=clameter@sgi.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).