From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Avi Kivity <avi@redhat.com>
Cc: Nick Piggin <npiggin@suse.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"hugh.dickins@tiscali.co.uk" <hugh.dickins@tiscali.co.uk>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
torvalds@linux-foundation.org
Subject: Re: [RFC][PATCH 0/4] ZERO PAGE again v2
Date: Tue, 7 Jul 2009 18:18:29 +0900 [thread overview]
Message-ID: <20090707181829.10d48272.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <4A530FD4.7060606@redhat.com>
On Tue, 07 Jul 2009 12:05:24 +0300
Avi Kivity <avi@redhat.com> wrote:
> On 07/07/2009 11:47 AM, Nick Piggin wrote:
> >> Any comments are welcome.
> >>
> >
> > Can we just try to wean them off it? Using zero page for huge sparse
> > matricies is probably not ideal anyway because it needs to still be
> > faulted in and it occupies TLB space. They might see better performance
> > by using a better algorithm.
> >
>
> For kvm live migration, I've thought of extending mincore() to report if
> a page will be read as zeros.
>
BTW, ksm can scale enough to combine all pages which just includes zero ?
No heavy cache ping-pong without zero-page ?
Thanks,
-Kame
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next prev parent reply other threads:[~2009-07-07 8:36 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-07 7:51 KAMEZAWA Hiroyuki
2009-07-07 7:52 ` [RFC][PATCH 1/4] introduce pte_zero() KAMEZAWA Hiroyuki
2009-07-07 7:54 ` [RFC][PATCH 2/4] use ZERO_PAGE for READ fault in regular anonymous mapping KAMEZAWA Hiroyuki
2009-07-07 7:59 ` [RFC][PATCH 3/4] get_user_pages READ fault handling special cases KAMEZAWA Hiroyuki
2009-07-07 16:50 ` Linus Torvalds
2009-07-08 0:03 ` KAMEZAWA Hiroyuki
2009-07-08 1:38 ` KAMEZAWA Hiroyuki
2009-07-08 2:27 ` Linus Torvalds
2009-07-07 8:01 ` [RFC][PATCH 4/4] add get user pages nozero KAMEZAWA Hiroyuki
2009-07-07 8:47 ` [RFC][PATCH 0/4] ZERO PAGE again v2 Nick Piggin
2009-07-07 9:05 ` Avi Kivity
2009-07-07 9:18 ` KAMEZAWA Hiroyuki [this message]
2009-07-07 9:26 ` Avi Kivity
2009-07-07 9:06 ` KAMEZAWA Hiroyuki
2009-07-07 14:00 ` Nick Piggin
2009-07-07 16:59 ` Linus Torvalds
2009-07-08 6:21 ` Nick Piggin
2009-07-08 16:07 ` Linus Torvalds
2009-07-09 7:47 ` Nick Piggin
2009-07-09 17:54 ` Linus Torvalds
2009-07-10 2:09 ` Nick Piggin
2009-07-10 3:38 ` Linus Torvalds
2009-07-10 3:51 ` Nick Piggin
2009-07-08 17:32 ` Andrea Arcangeli
2009-07-09 1:12 ` KAMEZAWA Hiroyuki
2009-07-10 11:18 ` Hugh Dickins
2009-07-10 13:42 ` Andrea Arcangeli
2009-07-10 14:12 ` KAMEZAWA Hiroyuki
2009-07-10 15:16 ` Andrea Arcangeli
2009-07-10 15:32 ` KAMEZAWA Hiroyuki
2009-07-10 17:09 ` Hugh Dickins
2009-07-13 6:46 ` Nick Piggin
2009-07-13 7:24 ` Nick Piggin
2009-07-07 15:50 KAMEZAWA Hiroyuki
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