From: Linus Torvalds <torvalds@linux-foundation.org>
To: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Rik van Riel <riel@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org
Subject: Re: [PATCH 7/8] mm: reinstate ZERO_PAGE
Date: Tue, 8 Sep 2009 07:13:55 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.01.0909080712200.7458@localhost.localdomain> (raw)
In-Reply-To: <20090908073119.GA29902@wotan.suse.de>
On Tue, 8 Sep 2009, Nick Piggin wrote:
>
> Without looking closely, why is it a big problem to have a
> !HAVE PTE SPECIAL case? Couldn't it just be a check for
> pfn == zero_pfn that is conditionally compiled away for pte
> special architectures anyway?
At least traditionally, there wasn't a single zero_pfn, but multiple (for
VIPT caches that have performance issues with aliases). But yeah, we could
check just the pfn number, and allow any architecture to do it.
Linus
next prev parent reply other threads:[~2009-09-08 14:14 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-07 21:26 [PATCH 0/8] mm: around get_user_pages flags Hugh Dickins
2009-09-07 21:29 ` [PATCH 1/8] mm: munlock use follow_page Hugh Dickins
2009-09-08 2:58 ` KAMEZAWA Hiroyuki
2009-09-08 11:30 ` Hugh Dickins
2009-09-08 17:10 ` Rik van Riel
2009-09-09 15:59 ` Minchan Kim
2009-09-11 11:07 ` Hiroaki Wakabayashi
2009-09-07 21:31 ` [PATCH 2/8] mm: remove unused GUP flags Hugh Dickins
2009-09-08 17:27 ` Rik van Riel
2009-09-07 21:33 ` [PATCH 3/8] mm: add get_dump_page Hugh Dickins
2009-09-08 18:57 ` Rik van Riel
2009-09-07 21:35 ` [PATCH 4/8] mm: FOLL_DUMP replace FOLL_ANON Hugh Dickins
2009-09-08 18:59 ` Rik van Riel
2009-09-09 11:14 ` Mel Gorman
2009-09-09 16:16 ` Minchan Kim
2009-09-13 15:46 ` Hugh Dickins
2009-09-13 23:05 ` Minchan Kim
2009-09-07 21:37 ` [PATCH 5/8] mm: follow_hugetlb_page flags Hugh Dickins
2009-09-08 22:21 ` Rik van Riel
2009-09-09 11:31 ` Mel Gorman
2009-09-13 15:35 ` Hugh Dickins
2009-09-14 13:27 ` Mel Gorman
2009-09-15 20:26 ` Hugh Dickins
2009-09-07 21:38 ` [PATCH 6/8] mm: fix anonymous dirtying Hugh Dickins
2009-09-08 22:23 ` Rik van Riel
2009-09-07 21:39 ` [PATCH 7/8] mm: reinstate ZERO_PAGE Hugh Dickins
2009-09-08 2:37 ` KAMEZAWA Hiroyuki
2009-09-08 11:56 ` Hugh Dickins
2009-09-09 1:44 ` KAMEZAWA Hiroyuki
2009-09-15 20:15 ` Hugh Dickins
2009-09-08 7:31 ` Nick Piggin
2009-09-08 12:17 ` Hugh Dickins
2009-09-08 15:34 ` Nick Piggin
2009-09-08 16:40 ` Hugh Dickins
2009-09-08 14:13 ` Linus Torvalds [this message]
2009-09-08 23:35 ` Rik van Riel
2009-09-07 21:40 ` [PATCH 8/8] mm: FOLL flags for GUP flags Hugh Dickins
2009-09-07 23:51 ` [PATCH 0/8] mm: around get_user_pages flags Linus Torvalds
2009-09-07 23:52 ` KAMEZAWA Hiroyuki
2009-09-08 0:00 ` KOSAKI Motohiro
2009-09-10 0:33 ` KOSAKI Motohiro
2009-09-15 20:16 ` Hugh Dickins
2009-09-15 20:30 ` [PATCH 0/4] mm: mlock, hugetlb, zero followups Hugh Dickins
2009-09-15 20:31 ` [PATCH 1/4] mm: m(un)lock avoid ZERO_PAGE Hugh Dickins
2009-09-16 0:08 ` KOSAKI Motohiro
2009-09-16 9:35 ` Mel Gorman
2009-09-16 11:40 ` Hugh Dickins
2009-09-16 12:47 ` Mel Gorman
2009-09-15 20:33 ` [PATCH 2/4] mm: hugetlbfs_pagecache_present Hugh Dickins
2009-09-15 20:37 ` [PATCH 3/4] mm: ZERO_PAGE without PTE_SPECIAL Hugh Dickins
2009-09-16 6:20 ` KAMEZAWA Hiroyuki
2009-09-15 20:38 ` [PATCH 4/4] mm: move highest_memmap_pfn Hugh Dickins
2009-09-17 0:33 ` [PATCH 0/4] mm: mlock, hugetlb, zero followups KOSAKI Motohiro
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=alpine.LFD.2.01.0909080712200.7458@localhost.localdomain \
--to=torvalds@linux-foundation.org \
--cc=akpm@linux-foundation.org \
--cc=hugh.dickins@tiscali.co.uk \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=npiggin@suse.de \
--cc=riel@redhat.com \
/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