From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM
Date: Wed, 23 Feb 2011 10:19:22 -0800 [thread overview]
Message-ID: <1298485162.7236.4.camel@nimitz> (raw)
In-Reply-To: <20110223151047.GA7275@tiehlicka.suse.cz>
On Wed, 2011-02-23 at 16:10 +0100, Michal Hocko wrote:
> We can reduce this internal fragmentation by splitting the single
> page_cgroup array into more arrays where each one is well kmalloc
> aligned. This patch implements this idea.
How about using alloc_pages_exact()? These things aren't allocated
often enough to really get most of the benefits of being in a slab.
That'll at least get you down to a maximum of about PAGE_SIZE wasted.
-- Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM
Date: Wed, 23 Feb 2011 10:19:22 -0800 [thread overview]
Message-ID: <1298485162.7236.4.camel@nimitz> (raw)
In-Reply-To: <20110223151047.GA7275@tiehlicka.suse.cz>
On Wed, 2011-02-23 at 16:10 +0100, Michal Hocko wrote:
> We can reduce this internal fragmentation by splitting the single
> page_cgroup array into more arrays where each one is well kmalloc
> aligned. This patch implements this idea.
How about using alloc_pages_exact()? These things aren't allocated
often enough to really get most of the benefits of being in a slab.
That'll at least get you down to a maximum of about PAGE_SIZE wasted.
-- Dave
--
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/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-02-23 18:19 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-23 15:10 [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM Michal Hocko
2011-02-23 15:10 ` Michal Hocko
2011-02-23 18:19 ` Dave Hansen [this message]
2011-02-23 18:19 ` Dave Hansen
2011-02-23 23:52 ` KAMEZAWA Hiroyuki
2011-02-23 23:52 ` KAMEZAWA Hiroyuki
2011-02-24 9:35 ` Michal Hocko
2011-02-24 9:35 ` Michal Hocko
2011-02-24 10:02 ` KAMEZAWA Hiroyuki
2011-02-24 10:02 ` KAMEZAWA Hiroyuki
2011-02-24 9:33 ` Michal Hocko
2011-02-24 9:33 ` Michal Hocko
2011-02-24 13:40 ` [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM v2 Michal Hocko
2011-02-24 13:40 ` Michal Hocko
2011-02-25 3:25 ` KAMEZAWA Hiroyuki
2011-02-25 3:25 ` KAMEZAWA Hiroyuki
2011-02-25 9:53 ` [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM v3 Michal Hocko
2011-02-25 9:53 ` Michal Hocko
2011-02-28 0:53 ` KAMEZAWA Hiroyuki
2011-02-28 0:53 ` KAMEZAWA Hiroyuki
2011-02-28 9:12 ` [RFC PATCH] page_cgroup: Reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM v4 Michal Hocko
2011-02-28 9:12 ` Michal Hocko
2011-02-28 9:23 ` KAMEZAWA Hiroyuki
2011-02-28 9:23 ` KAMEZAWA Hiroyuki
2011-02-28 9:53 ` Michal Hocko
2011-02-28 9:53 ` Michal Hocko
2011-02-28 9:48 ` KAMEZAWA Hiroyuki
2011-02-28 9:48 ` KAMEZAWA Hiroyuki
2011-02-28 10:12 ` Michal Hocko
2011-02-28 10:12 ` Michal Hocko
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=1298485162.7236.4.camel@nimitz \
--to=dave@linux.vnet.ibm.com \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.cz \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.