From: "David S. Miller" <davem@redhat.com>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: hugh@veritas.com, willy@debian.org, 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 12:19:55 -0700 [thread overview]
Message-ID: <20030822121955.619a14eb.davem@redhat.com> (raw)
In-Reply-To: <1061578568.2053.313.camel@mulgrave>
On 22 Aug 2003 13:56:06 -0500
James Bottomley <James.Bottomley@SteelEye.com> wrote:
> On Fri, 2003-08-22 at 13:31, David S. Miller wrote:
> > On Fri, 22 Aug 2003 19:34:41 +0100 (BST)
> > Hugh Dickins <hugh@veritas.com> wrote:
> >
> > > And to me. If VM_SHARED is set, then __vma_link_file puts the vma on
> > > on i_mmap_shared. If VM_SHARED is not set, it puts the vma on i_mmap.
> > > flush_dcache_page treats i_mmap_shared and i_mmap lists equally.
> >
> > But file system page cache writes only call flush_dache_page()
> > if the page has a non-empty i_mmap_shared list.
>
> Hmm, but if it does that then the glibc bug test should show up on sparc
> because the i_mmap_shared list is empty if we only do MAP_SHARED of read
> only files.
Sparc64's alias'able caches are 1) write-through and 2) quite small.
I think I begin to see the issue clearly now.
But you cannot do the VM_SHARED change without an audit first.
Lots of code thinks that VM_SHARED means someone maybe wrote
to the page through a mmap(). For example look at how filemap
sync interprets this flag bit.
next prev parent reply other threads:[~2003-08-22 19:27 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 [this message]
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
2003-08-22 16:39 ` David S. Miller
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