linux-kernel - Re: [uml-devel] [PATCH] um: ubd: Add REQ

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Message-ID: <CAMuHMdXgGPFx6OwHdc73bY6Cb1jYHbjpEqq6e+YC9RuvJYRxDw@mail.gmail.com>
Date:	Mon, 19 Aug 2013 12:13:14 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Richard W.M. Jones" <rjones@...hat.com>
Cc:	Richard Weinberger <richard@....at>,
	Al Viro <viro@...iv.linux.org.uk>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [uml-devel] [PATCH] um: ubd: Add REQ_FLUSH suppport

Hi Richard,

On Mon, Aug 19, 2013 at 11:18 AM, Richard W.M. Jones <rjones@...hat.com> wrote:
> On Sun, Aug 18, 2013 at 12:09:34AM +0200, Richard Weinberger wrote:
>> UML's block device driver does not support write barriers,
>> to support this this patch adds REQ_FLUSH suppport.
>> Every time the block layer sends a REQ_FLUSH we fsync() now
>> our backing file to guarantee data consistency.
>
> This fixes the sync problem I saw before.  So:

What's the impact on your performance figures?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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