linux-kernel - Re: page fault scalability (ext3, ext4, xfs)

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Message-ID: <CALCETrVaRQ3WQ5++Uu_0JTaVnjUugAaAhqQK__7r5YWvLxpAhw@mail.gmail.com>
Date:	Wed, 14 Aug 2013 16:38:12 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"Theodore Ts'o" <tytso@....edu>,
	Dave Hansen <dave.hansen@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com,
	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, david@...morbit.com,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: page fault scalability (ext3, ext4, xfs)

On Wed, Aug 14, 2013 at 4:06 PM, Theodore Ts'o <tytso@....edu> wrote:
> On Wed, Aug 14, 2013 at 01:50:02PM -0700, Dave Hansen wrote:
>>
>> Would a plain old fallocate() do the trick, or does it actually need
>> zeros written to it?
>
> It would be better to write zeros to it, so we aren't measuring the
> cost of the unwritten->written conversion.

At the risk of beating a dead horse, how hard would it be to defer
this part until writeback?

--Andy
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