From: Jamie Lokier <jamie@shareable.org>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
steve@chygwyn.com, zbr@ioremap.net, npiggin@suse.de,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [patch] fs: improved handling of page and buffer IO errors
Date: Wed, 22 Oct 2008 13:48:29 +0100 [thread overview]
Message-ID: <20081022124829.GA826@shareable.org> (raw)
In-Reply-To: <20081021162957.GQ26184@parisc-linux.org>
Matthew Wilcox wrote:
> On Tue, Oct 21, 2008 at 06:28:01PM +0200, Miklos Szeredi wrote:
> > On Tue, 21 Oct 2008, Miklos Szeredi wrote:
> > > BTW, why do you want strict coherency for memory mappings? It's not
> > > something POSIX mandates. It's not even something that Linux always
> > > did.
> >
> > Or does, for that matter, on those architectures which have virtually
> > addressed caches.
>
> Careful with those slurs you're throwing around. PA-RISC carefully
> aligns its mmaps so they are coherent.
(Unless you use MAP_FIXED?)
Last time I looked at the coherency code, there appeared to be a few
bugs on some architectures, but I didn't have the architectures to
test and confirm them. It was a long time ago, in the 2.4 era though.
-- Jamie
WARNING: multiple messages have this Message-ID (diff)
From: Jamie Lokier <jamie@shareable.org>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
steve@chygwyn.com, zbr@ioremap.net, npiggin@suse.de,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [patch] fs: improved handling of page and buffer IO errors
Date: Wed, 22 Oct 2008 13:48:29 +0100 [thread overview]
Message-ID: <20081022124829.GA826@shareable.org> (raw)
In-Reply-To: <20081021162957.GQ26184@parisc-linux.org>
Matthew Wilcox wrote:
> On Tue, Oct 21, 2008 at 06:28:01PM +0200, Miklos Szeredi wrote:
> > On Tue, 21 Oct 2008, Miklos Szeredi wrote:
> > > BTW, why do you want strict coherency for memory mappings? It's not
> > > something POSIX mandates. It's not even something that Linux always
> > > did.
> >
> > Or does, for that matter, on those architectures which have virtually
> > addressed caches.
>
> Careful with those slurs you're throwing around. PA-RISC carefully
> aligns its mmaps so they are coherent.
(Unless you use MAP_FIXED?)
Last time I looked at the coherency code, there appeared to be a few
bugs on some architectures, but I didn't have the architectures to
test and confirm them. It was a long time ago, in the 2.4 era though.
-- Jamie
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next prev parent reply other threads:[~2008-10-22 12:49 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-21 11:21 [patch] fs: improved handling of page and buffer IO errors Nick Piggin
2008-10-21 11:21 ` Nick Piggin
2008-10-21 12:52 ` Miklos Szeredi
2008-10-21 12:52 ` Miklos Szeredi
2008-10-21 12:59 ` steve
2008-10-21 12:59 ` steve
2008-10-21 13:14 ` Miklos Szeredi
2008-10-21 13:14 ` Miklos Szeredi
2008-10-21 13:38 ` steve
2008-10-21 13:38 ` steve
2008-10-21 14:32 ` Miklos Szeredi
2008-10-21 14:32 ` Miklos Szeredi
2008-10-21 15:09 ` steve
2008-10-21 15:09 ` steve
2008-10-21 16:13 ` Miklos Szeredi
2008-10-21 16:13 ` Miklos Szeredi
2008-10-22 12:51 ` Jamie Lokier
2008-10-22 12:51 ` Jamie Lokier
2008-10-22 14:08 ` Miklos Szeredi
2008-10-22 14:08 ` Miklos Szeredi
2008-10-21 14:35 ` Evgeniy Polyakov
2008-10-21 14:35 ` Evgeniy Polyakov
2008-10-21 14:59 ` steve
2008-10-21 14:59 ` steve
2008-10-21 16:20 ` Miklos Szeredi
2008-10-21 16:20 ` Miklos Szeredi
2008-10-21 16:25 ` steve
2008-10-21 16:25 ` steve
2008-10-21 16:28 ` Miklos Szeredi
2008-10-21 16:28 ` Miklos Szeredi
2008-10-21 16:29 ` Matthew Wilcox
2008-10-21 16:29 ` Matthew Wilcox
2008-10-22 12:48 ` Jamie Lokier [this message]
2008-10-22 12:48 ` Jamie Lokier
2008-10-22 13:45 ` Matthew Wilcox
2008-10-22 13:45 ` Matthew Wilcox
2008-10-22 14:02 ` Miklos Szeredi
2008-10-22 14:02 ` Miklos Szeredi
2008-10-22 14:35 ` Matthew Wilcox
2008-10-22 14:45 ` Miklos Szeredi
2008-10-22 14:45 ` Miklos Szeredi
2008-10-23 13:48 ` Matthew Wilcox
2008-10-23 13:48 ` Matthew Wilcox
2008-10-22 22:23 ` Mark Fasheh
2008-10-22 22:23 ` Mark Fasheh
2008-10-23 9:59 ` steve
2008-10-23 9:59 ` steve
2008-10-23 10:21 ` Nick Piggin
2008-10-23 10:21 ` Nick Piggin
2008-10-23 10:52 ` steve
2008-10-23 10:52 ` steve
2008-10-23 11:07 ` Nick Piggin
2008-10-23 11:07 ` Nick Piggin
2008-10-22 13:16 ` Nick Piggin
2008-10-22 13:16 ` Nick Piggin
2008-10-22 20:09 ` Miklos Szeredi
2008-10-22 20:09 ` Miklos Szeredi
2008-10-21 16:16 ` Andi Kleen
2008-10-21 16:16 ` Andi Kleen
2008-10-21 16:30 ` steve
2008-10-21 16:30 ` steve
2008-10-22 10:31 ` Nick Piggin
2008-10-22 10:31 ` Nick Piggin
2008-10-22 18:46 ` Brad Boyer
2008-10-22 18:46 ` Brad Boyer
2008-10-22 20:19 ` Andi Kleen
2008-10-22 20:19 ` Andi Kleen
2008-10-23 7:08 ` Nick Piggin
2008-10-23 7:08 ` Nick Piggin
2008-10-22 23:07 ` Dave Chinner
2008-10-22 23:07 ` Dave Chinner
2008-10-23 7:07 ` Nick Piggin
2008-10-23 7:07 ` Nick Piggin
2008-10-23 9:44 ` steve
2008-10-23 9:44 ` steve
2008-10-23 11:15 ` Nick Piggin
2008-10-23 11:15 ` Nick Piggin
2008-10-23 22:48 ` Dave Chinner
2008-10-23 22:48 ` Dave Chinner
2008-10-24 1:05 ` Nick Piggin
2008-10-24 1:05 ` Nick Piggin
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