From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <npiggin@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hugh@veritas.com>,
Linux Memory Management List <linux-mm@kvack.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andi Kleen <ak@suse.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [patch] mm: fix PageUptodate memory ordering bug
Date: Sun, 30 Dec 2007 17:33:15 +0100 [thread overview]
Message-ID: <20071230163315.GA1384@elte.hu> (raw)
In-Reply-To: <20071223091405.GA15631@wotan.suse.de>
* Nick Piggin <npiggin@suse.de> wrote:
> > Sounds worthwhile, if we can't do it via altinstructions.
>
> Altinstructions means we still have code bloat, and sometimes extra
> branches etc (an extra 900 bytes of icache in mm/ alone, even before
> my fix). I'll let Linus or one of the x86 guys weigh in, though. It's
> a really sad cost for distro kernels to carry.
hm, we should at minimum display a warning if the workaround is not
enabled and such a kernel is booted on a true PPro that is affected by
this.
Ingo
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next prev parent reply other threads:[~2007-12-30 16:33 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-18 1:26 [patch] mm: fix PageUptodate memory ordering bug Nick Piggin
2007-12-22 8:57 ` Andrew Morton
2007-12-22 12:14 ` Hugh Dickins
2007-12-23 6:54 ` Nick Piggin
2007-12-23 6:54 ` Nick Piggin
2007-12-23 5:57 ` Nick Piggin
2007-12-23 6:32 ` Andrew Morton
2007-12-23 7:15 ` Nick Piggin
2007-12-23 7:29 ` Andrew Morton
2007-12-23 9:14 ` Nick Piggin
2007-12-23 9:28 ` Andrew Morton
2007-12-23 16:02 ` Andi Kleen
2007-12-30 16:33 ` Ingo Molnar [this message]
2008-01-01 23:26 ` Nick Piggin
2008-01-02 21:01 ` Andi Kleen
2008-01-03 3:32 ` Nick Piggin
2008-01-03 13:08 ` Andi Kleen
2007-12-23 17:22 ` Linus Torvalds
2007-12-23 21:35 ` Nick Piggin
2007-12-23 22:41 ` Nick Piggin
2008-01-01 23:41 ` Alan Cox
2008-01-02 11:02 ` [patch] i386: avoid expensive ppro ordering workaround for default 686 kernels Nick Piggin
2008-01-02 13:44 ` Alan Cox
2008-01-03 4:17 ` Nick Piggin
2008-01-03 14:23 ` Alan Cox
2008-01-03 20:20 ` Benjamin Herrenschmidt
2008-01-03 22:23 ` Alan Cox
2008-01-03 23:10 ` Nick Piggin
2008-01-04 16:27 ` Alan Cox
2008-01-07 0:12 ` Nick Piggin
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