linux-kernel - Re: "fb-defio: fix page list with concurrent processes"

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Message-ID: <45a44e480806170121s222906cdt23db2d6c394a50a1@mail.gmail.com>
Date:	Tue, 17 Jun 2008 01:21:13 -0700
From:	"Jaya Kumar" <jayakumar.lkml@...il.com>
To:	"Markus Armbruster" <armbru@...hat.com>
Cc:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: "fb-defio: fix page list with concurrent processes"

On Tue, Jun 17, 2008 at 12:34 AM, Markus Armbruster <armbru@...hat.com> wrote:
> "Jaya Kumar" <jayakumar.lkml@...il.com> writes:
>
>> On Mon, Jun 16, 2008 at 3:05 PM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>>> Your patch "fb-defio: fix page list with concurrent processes" definitely
>>> seems to help with the suspend/resume problem I had with the Xen pvfb
>>> device.  Is it queued up anywhere?  It seems to be a real bugfix, and should
>>> probably be queued for 2.6.26...
>>
>> It isn't currently queued. I had intended to improve its performance
>> by taking advantage of Andrew's suggestion of using !list_empty on the
>> page->lru to avoid walking the page list to find the duplicate page,
>> but I ran into trouble since the page starts off being on the lru
>> list. I'll try to take a look at doing this next weekend.
>>
>> Thanks,
>> jaya
>
> Well, we got a bug that makes the code useless in practice for us, and
> a fix for it that's not quite as fast as it could be.  Which is
> better, somewhat slow code, or somewhat useless code?  I'd like to see
> the fix merged as soon as possible.  You can always improve its
> performance later.
>

Ok, I didn't realize there was any time pressure. Keep in mind, I'm
just a person doing this stuff for fun on weekends not someone under
commercial pressures. Yup, I've got no problem if the old patch is
requeued and merged.

Thanks,
jaya
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