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
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WARNING: multiple messages have this Message-ID (diff)
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)
Message-ID: <20090908141355.jjBS9ebrAGiifrv1MEEp_3zUb3dz4e9cdhjvUb7nC7c@z> (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 14:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.64.0909072222070.15424@sister.anvils>
[not found] ` <Pine.LNX.4.64.0909072238320.15430@sister.anvils>
2009-09-08 7:31 ` [PATCH 7/8] mm: reinstate ZERO_PAGE Nick Piggin
2009-09-08 7:31 ` Nick Piggin
2009-09-08 12:17 ` Hugh Dickins
2009-09-08 12:17 ` Hugh Dickins
2009-09-08 15:34 ` Nick Piggin
2009-09-08 16:40 ` Hugh Dickins
2009-09-08 16:40 ` Hugh Dickins
2009-09-08 14:13 ` Linus Torvalds [this message]
2009-09-08 14:13 ` Linus Torvalds
[not found] ` <Pine.LNX.4.64.0909152127240.22199@sister.anvils>
2009-09-15 20:37 ` [PATCH 3/4] mm: ZERO_PAGE without PTE_SPECIAL Hugh Dickins
2009-09-15 20:37 ` Hugh Dickins
2009-09-16 6:20 ` KAMEZAWA Hiroyuki
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