From: Matt Mackall <mpm@selenic.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, William Lee Irwin III <wli@holomorphy.com>
Subject: Re: [patch 2/3] only allow nonlinear vmas for ram backed filesystems
Date: Sun, 25 Mar 2007 10:51:27 -0500 [thread overview]
Message-ID: <20070325155127.GR10459@waste.org> (raw)
In-Reply-To: <1174824752.5149.28.camel@lappy>
On Sun, Mar 25, 2007 at 02:12:32PM +0200, Peter Zijlstra wrote:
> On Sat, 2007-03-24 at 23:09 +0100, Miklos Szeredi wrote:
> > From: Miklos Szeredi <mszeredi@suse.cz>
> >
> > Dirty page accounting/limiting doesn't work for nonlinear mappings, so
> > for non-ram backed filesystems emulate with linear mappings. This
> > retains ABI compatibility with previous kernels at minimal code cost.
> >
> > All known users of nonlinear mappings actually use tmpfs, so this
> > shouldn't have any negative effect.
They do? I thought the whole point of nonlinear mappings was for
mapping files bigger than the address space (eg. databases). Is Oracle
instead using this to map >3G files on a tmpfs??
--
Mathematics is the supreme nostalgia of our time.
WARNING: multiple messages have this Message-ID (diff)
From: Matt Mackall <mpm@selenic.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, William Lee Irwin III <wli@holomorphy.com>
Subject: Re: [patch 2/3] only allow nonlinear vmas for ram backed filesystems
Date: Sun, 25 Mar 2007 10:51:27 -0500 [thread overview]
Message-ID: <20070325155127.GR10459@waste.org> (raw)
In-Reply-To: <1174824752.5149.28.camel@lappy>
On Sun, Mar 25, 2007 at 02:12:32PM +0200, Peter Zijlstra wrote:
> On Sat, 2007-03-24 at 23:09 +0100, Miklos Szeredi wrote:
> > From: Miklos Szeredi <mszeredi@suse.cz>
> >
> > Dirty page accounting/limiting doesn't work for nonlinear mappings, so
> > for non-ram backed filesystems emulate with linear mappings. This
> > retains ABI compatibility with previous kernels at minimal code cost.
> >
> > All known users of nonlinear mappings actually use tmpfs, so this
> > shouldn't have any negative effect.
They do? I thought the whole point of nonlinear mappings was for
mapping files bigger than the address space (eg. databases). Is Oracle
instead using this to map >3G files on a tmpfs??
--
Mathematics is the supreme nostalgia of our time.
--
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next prev parent reply other threads:[~2007-03-25 16:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-24 22:07 [patch 1/3] split mmap Miklos Szeredi
2007-03-24 22:07 ` Miklos Szeredi, Miklos Szeredi
2007-03-24 22:09 ` [patch 2/3] only allow nonlinear vmas for ram backed filesystems Miklos Szeredi
2007-03-24 22:09 ` Miklos Szeredi, Miklos Szeredi
2007-03-25 12:12 ` Peter Zijlstra
2007-03-25 12:12 ` Peter Zijlstra
2007-03-25 15:51 ` Matt Mackall [this message]
2007-03-25 15:51 ` Matt Mackall
2007-03-27 0:02 ` William Lee Irwin III
2007-03-27 0:02 ` William Lee Irwin III
2007-03-26 0:00 ` Andrew Morton
2007-03-26 0:00 ` Andrew Morton
2007-03-26 6:57 ` Peter Zijlstra
2007-03-26 6:57 ` Peter Zijlstra
2007-03-24 22:11 ` [patch 3/3] update ctime and mtime for mmaped write Miklos Szeredi
2007-03-24 22:11 ` Miklos Szeredi, Miklos Szeredi
2007-03-25 12:12 ` Peter Zijlstra
2007-03-25 12:12 ` Peter Zijlstra
2007-03-25 21:08 ` Miklos Szeredi
2007-03-25 21:08 ` Miklos Szeredi
2007-03-25 12:12 ` [patch 1/3] split mmap Peter Zijlstra
2007-03-25 12:12 ` Peter Zijlstra
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