From: Olof Johansson <olof@lixom.net>
To: Benjamin Herrenschmidt <benh@au1.ibm.com>
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH] powerpc: Fix buglet with MMU hash management
Date: Mon, 29 May 2006 23:36:26 -0500 [thread overview]
Message-ID: <20060530043626.GC5101@pb15.lixom.net> (raw)
In-Reply-To: <1148962460.15722.19.camel@localhost.localdomain>
On Tue, May 30, 2006 at 02:14:19PM +1000, Benjamin Herrenschmidt wrote:
> This fixes by allowing the updating of the protection bits in the native
> hash handling to also set (but not clear) the "C" bit, and, in order to
> also improve performances in the general case, by always setting that
> bit on newly inserted hash PTE so that writeback really never happens.
Good catch!
However, you'll have a writeback on the R bit too, you should set that
together with C.
-Olof
next prev parent reply other threads:[~2006-05-30 4:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-30 4:14 [PATCH] powerpc: Fix buglet with MMU hash management Benjamin Herrenschmidt
2006-05-30 4:36 ` Olof Johansson [this message]
2006-05-30 4:55 ` Benjamin Herrenschmidt
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