From: Christoph Hellwig <hch@infradead.org>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Cong Wang <amwang@redhat.com>,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
Pekka Enberg <penberg@kernel.org>,
Hugh Dickins <hughd@google.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Lennart Poettering <lennart@poettering.net>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-mm@kvack.org
Subject: Re: [V2 PATCH] tmpfs: add fallocate support
Date: Mon, 21 Nov 2011 05:06:22 -0500 [thread overview]
Message-ID: <20111121100622.GA17887@infradead.org> (raw)
In-Reply-To: <CAPXgP10q8Fba3vr0zf-XBBaRPwjP7MyJ=-QRL45_8WC-vtotOg@mail.gmail.com>
On Sat, Nov 19, 2011 at 03:14:48PM +0100, Kay Sievers wrote:
> On Sat, Nov 19, 2011 at 11:03, Christoph Hellwig <hch@infradead.org> wrote:
> > On Fri, Nov 18, 2011 at 06:39:50PM +0800, Cong Wang wrote:
> >> It seems that systemd needs tmpfs to support fallocate,
> >> see http://lkml.org/lkml/2011/10/20/275. This patch adds
> >> fallocate support to tmpfs.
> >
> > What for exactly? ??Please explain why preallocating on tmpfs would
> > make any sense.
>
> To be able to safely use mmap(), regarding SIGBUS, on files on the
> /dev/shm filesystem. The glibc fallback loop for -ENOSYS on fallocate
> is just ugly.
That is the kind of information which needs to be in the changelog.
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WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Cong Wang <amwang@redhat.com>,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
Pekka Enberg <penberg@kernel.org>,
Hugh Dickins <hughd@google.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Lennart Poettering <lennart@poettering.net>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-mm@kvack.org
Subject: Re: [V2 PATCH] tmpfs: add fallocate support
Date: Mon, 21 Nov 2011 05:06:22 -0500 [thread overview]
Message-ID: <20111121100622.GA17887@infradead.org> (raw)
In-Reply-To: <CAPXgP10q8Fba3vr0zf-XBBaRPwjP7MyJ=-QRL45_8WC-vtotOg@mail.gmail.com>
On Sat, Nov 19, 2011 at 03:14:48PM +0100, Kay Sievers wrote:
> On Sat, Nov 19, 2011 at 11:03, Christoph Hellwig <hch@infradead.org> wrote:
> > On Fri, Nov 18, 2011 at 06:39:50PM +0800, Cong Wang wrote:
> >> It seems that systemd needs tmpfs to support fallocate,
> >> see http://lkml.org/lkml/2011/10/20/275. This patch adds
> >> fallocate support to tmpfs.
> >
> > What for exactly? ??Please explain why preallocating on tmpfs would
> > make any sense.
>
> To be able to safely use mmap(), regarding SIGBUS, on files on the
> /dev/shm filesystem. The glibc fallback loop for -ENOSYS on fallocate
> is just ugly.
That is the kind of information which needs to be in the changelog.
next prev parent reply other threads:[~2011-11-21 10:06 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-18 10:39 [V2 PATCH] tmpfs: add fallocate support Cong Wang
2011-11-18 10:39 ` Cong Wang
2011-11-19 10:03 ` Christoph Hellwig
2011-11-19 10:03 ` Christoph Hellwig
2011-11-19 14:14 ` Kay Sievers
2011-11-19 14:14 ` Kay Sievers
2011-11-20 21:39 ` Hugh Dickins
2011-11-21 10:11 ` Christoph Hellwig
2011-11-21 10:11 ` Christoph Hellwig
2011-11-21 22:13 ` Hugh Dickins
2011-11-21 22:13 ` Hugh Dickins
2011-11-22 5:50 ` Cong Wang
2011-11-22 5:50 ` Cong Wang
2011-11-21 10:06 ` Christoph Hellwig [this message]
2011-11-21 10:06 ` Christoph Hellwig
2011-11-22 5:39 ` Cong Wang
2011-11-22 5:39 ` Cong Wang
2011-11-20 21:22 ` Hugh Dickins
2011-11-20 21:22 ` Hugh Dickins
2011-11-21 10:11 ` Christoph Hellwig
2011-11-21 10:11 ` Christoph Hellwig
2011-11-22 5:39 ` Cong Wang
2011-11-22 5:39 ` Cong Wang
2011-11-22 22:06 ` Andrew Morton
2011-11-22 22:06 ` Andrew Morton
2011-11-23 4:30 ` Cong Wang
2011-11-23 4:30 ` Cong Wang
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