From: Peter Zijlstra <peterz@infradead.org>
To: Dave Airlie <airlied@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
dri-devel <dri-devel@lists.sourceforge.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: uncached page allocator
Date: Tue, 21 Aug 2007 16:56:05 +0200 [thread overview]
Message-ID: <1187708165.6114.256.camel@twins> (raw)
In-Reply-To: <21d7e9970708202305h5128aa5cy847dafe033b00742@mail.gmail.com>
On Tue, 2007-08-21 at 16:05 +1000, Dave Airlie wrote:
> So you can see why some sort of uncached+writecombined page cache
> would be useful, I could just allocate a bunch of pages at startup as
> uncached+writecombined, and allocate pixmaps from them and when I
> bind/free the pixmap I don't need the flush at all, now I'd really
> like this to be part of the VM so that under memory pressure it can
> just take the pages I've got in my cache back and after flushing turn
> them back into cached pages, the other option is for the DRM to do
> this on its own and penalise the whole system.
Can't you make these pages part of the regular VM by sticking them all
into an address_space.
And for this reclaim behaviour you'd only need to set PG_private and
have a_ops->releasepage() dtrt.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Dave Airlie <airlied@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
dri-devel <dri-devel@lists.sourceforge.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management <linux-mm@kvack.org>
Subject: Re: uncached page allocator
Date: Tue, 21 Aug 2007 16:56:05 +0200 [thread overview]
Message-ID: <1187708165.6114.256.camel@twins> (raw)
In-Reply-To: <21d7e9970708202305h5128aa5cy847dafe033b00742@mail.gmail.com>
On Tue, 2007-08-21 at 16:05 +1000, Dave Airlie wrote:
> So you can see why some sort of uncached+writecombined page cache
> would be useful, I could just allocate a bunch of pages at startup as
> uncached+writecombined, and allocate pixmaps from them and when I
> bind/free the pixmap I don't need the flush at all, now I'd really
> like this to be part of the VM so that under memory pressure it can
> just take the pages I've got in my cache back and after flushing turn
> them back into cached pages, the other option is for the DRM to do
> this on its own and penalise the whole system.
Can't you make these pages part of the regular VM by sticking them all
into an address_space.
And for this reclaim behaviour you'd only need to set PG_private and
have a_ops->releasepage() dtrt.
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next prev parent reply other threads:[~2007-08-21 14:56 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-20 0:45 uncached page allocator Dave Airlie
2007-08-20 8:41 ` Alan Cox
2007-08-21 6:05 ` Dave Airlie
2007-08-21 6:05 ` Dave Airlie
2007-08-21 14:56 ` Peter Zijlstra [this message]
2007-08-21 14:56 ` Peter Zijlstra
2007-08-27 20:00 ` Christoph Lameter
2007-08-27 20:00 ` Christoph Lameter
2007-08-30 7:23 ` Nick Piggin
2007-08-30 7:23 ` Nick Piggin
-- strict thread matches above, loose matches on Subject: below --
2007-08-20 12:36 Daniel J Blueman
2007-08-21 6:06 ` Dave Airlie
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