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From: Russell King <rmk@arm.linux.org.uk>
To: Matthew Wilcox <willy@debian.org>
Cc: "David S. Miller" <davem@redhat.com>,
	James Bottomley <James.Bottomley@SteelEye.com>,
	linux-kernel@vger.kernel.org,
	parisc-linux@lists.parisc-linux.org, drepper@redhat.com
Subject: Re: [parisc-linux] Re: Problems with kernel mmap (failing tst-mmap-eofsync in glibc on parisc)
Date: Fri, 22 Aug 2003 17:42:03 +0100	[thread overview]
Message-ID: <20030822174203.H12903@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20030822163429.GH18834@parcelfarce.linux.theplanet.co.uk>; from willy@debian.org on Fri, Aug 22, 2003 at 05:34:29PM +0100

On Fri, Aug 22, 2003 at 05:34:29PM +0100, Matthew Wilcox wrote:
> On Fri, Aug 22, 2003 at 09:14:47AM -0700, David S. Miller wrote:
> > On 22 Aug 2003 09:40:37 -0500
> > James Bottomley <James.Bottomley@SteelEye.com> wrote:
> > > The reason this doesn't happen is because the mapping is not on the
> > > mmap_shared list that flush_dcache_page() updates.
> > 
> > flush_dcache_page() checks both the shared and non-shared mmap lists,
> > so if it is on _either_ list it is flushed.  It does not check only
> > the shared list.

Eww.

> Gah, that's going to get really inefficient.  I still think we want to
> split flush_dcache_page() into two operations -- flush_dcache_user() and
> flush_dcache_kernel().  flush_dcache_user() would flush this specific
> user mapping back to ram and flush_dcache_kernel() would flush the
> kernel mapping.

Where are you proposing calling only _user() and _kernel() from ?

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html


  parent reply	other threads:[~2003-08-22 16:42 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-22 14:40 Problems with kernel mmap (failing tst-mmap-eofsync in glibc on parisc) James Bottomley
2003-08-22 16:14 ` David S. Miller
2003-08-22 16:34   ` [parisc-linux] " Matthew Wilcox
2003-08-22 16:39     ` David S. Miller
2003-08-22 17:41       ` Matthew Wilcox
2003-08-22 17:36         ` David S. Miller
2003-08-22 18:01           ` David S. Miller
2003-08-22 18:34             ` Hugh Dickins
2003-08-22 18:31               ` David S. Miller
2003-08-22 18:56                 ` James Bottomley
2003-08-22 19:19                   ` David S. Miller
2003-08-22 22:27                     ` James Bottomley
2003-08-22 22:41                       ` David S. Miller
2003-08-23  1:09                         ` James Bottomley
2003-08-23  7:22                           ` Hugh Dickins
2003-08-23 15:59                             ` James Bottomley
2003-08-23 21:44                             ` David S. Miller
2003-08-23 21:43                           ` David S. Miller
2003-08-23 22:21                             ` James Bottomley
2003-08-23 22:51                               ` David S. Miller
2003-08-23 23:01                                 ` James Bottomley
2003-08-23 22:53                               ` David S. Miller
2003-08-23 23:11                                 ` James Bottomley
2003-08-24  0:22                                   ` David S. Miller
     [not found]                                     ` <1061702282.1992.1153.camel@mulgrave>
     [not found]                                       ` <20030823222300.4695a0c4.davem@redhat.com>
2003-08-24 16:54                                         ` James Bottomley
2003-08-22 18:41               ` James Bottomley
2003-08-22 19:02                 ` Hugh Dickins
2003-08-22 19:09                 ` Randolph Chung
2003-08-22 16:42     ` Russell King [this message]
2003-08-22 16:39       ` David S. Miller

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