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Re: page fault scalability (ext3, ext4, xfs)

To: "Theodore Ts'o" <tytso@xxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, Jan Kara <jack@xxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, david@xxxxxxxxxxxxx, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Subject: Re: page fault scalability (ext3, ext4, xfs)
From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Date: Wed, 14 Aug 2013 16:38:12 -0700
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130814230648.GD22316@xxxxxxxxx>
References: <520BB9EF.5020308@xxxxxxxxxxxxxxx> <20130814194359.GA22316@xxxxxxxxx> <520BED7A.4000903@xxxxxxxxx> <20130814230648.GD22316@xxxxxxxxx>
On Wed, Aug 14, 2013 at 4:06 PM, Theodore Ts'o <tytso@xxxxxxx> 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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