From: Christoph Hellwig <hch@infradead.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Matthew Wilcox <willy6545@gmail.com>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
Julia Lawall <julia.lawall@lip6.fr>,
linux-mm@kvack.org, cl@linux.com, Jan Kara <jack@suse.cz>,
matthew@wil.cx, x86@kernel.org, luto@amacapital.net,
martin.petersen@oracle.com, jthumshirn@suse.de,
broonie@kernel.org, Juergen Gross <jgross@suse.com>,
linux-spi@vger.kernel.org, Joerg Roedel <joro@8bytes.org>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
"lsf-pc@lists.linux-foundation.org"
<lsf-pc@lists.linux-foundation.org>
Subject: Re: [LSF/MM TOPIC NOTES] x86 ZONE_DMA love
Date: Thu, 3 May 2018 05:13:22 -0700 [thread overview]
Message-ID: <20180503121322.GA14864@infradead.org> (raw)
In-Reply-To: <20180503120338.GG4535@dhcp22.suse.cz>
On Thu, May 03, 2018 at 02:03:38PM +0200, Michal Hocko wrote:
> On Sat 28-04-18 19:10:47, Matthew Wilcox wrote:
> > Another way we could approach this is to get rid of ZONE_DMA. Make GFP_DMA
> > a flag which doesn't map to a zone. Rather, it redirects to a separate
> > allocator. At boot, we hand all memory under 16MB to the DMA allocator. The
> > DMA allocator can have a shrinker which just hands back all the memory once
> > we're under memory pressure (if it's never had an allocation).
>
> Yeah, that was exactly the plan with the CMA allocator... We wouldn't
> need the shrinker because who cares about 16MB which is not usable
> anyway.
The CMA pool sounds fine. But please kill GFP_DMA off first / at the
same time. 95% of the users are either completely bogus or should be
using the DMA API, and the few other can use the new allocator directly.
next prev parent reply other threads:[~2018-05-03 12:13 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-26 21:54 [LSF/MM TOPIC NOTES] x86 ZONE_DMA love Luis R. Rodriguez
2018-04-27 1:09 ` [Lsf-pc] " Rik van Riel
2018-04-27 5:35 ` Christoph Hellwig
2018-04-27 7:18 ` Michal Hocko
2018-04-27 16:07 ` Christopher Lameter
2018-04-27 16:18 ` Matthew Wilcox
2018-04-27 16:36 ` Christopher Lameter
2018-04-28 8:33 ` Christoph Hellwig
2018-04-27 16:37 ` Michal Hocko
2018-04-28 8:33 ` Christoph Hellwig
2018-04-28 8:30 ` Christoph Hellwig
2018-04-27 16:14 ` Luis R. Rodriguez
2018-04-27 16:28 ` Matthew Wilcox
2018-04-28 8:42 ` Christoph Hellwig
2018-04-28 18:55 ` Luis R. Rodriguez
2018-04-28 19:10 ` Matthew Wilcox
2018-05-03 12:03 ` Michal Hocko
2018-05-03 12:13 ` Christoph Hellwig [this message]
2018-04-28 19:46 ` Julia Lawall
2018-04-28 20:41 ` Matthew Wilcox
2018-04-29 14:34 ` Julia Lawall
2018-05-03 8:20 ` Geert Uytterhoeven
2018-05-05 16:08 ` Are media drivers abusing of GFP_DMA? - was: " Mauro Carvalho Chehab
2018-05-07 13:26 ` Laurent Pinchart
2018-05-07 15:19 ` Mauro Carvalho Chehab
2018-05-14 8:00 ` Fabien DESSENNE
2018-05-14 10:35 ` Mauro Carvalho Chehab
2018-05-14 10:39 ` Mauro Carvalho Chehab
2018-05-15 7:30 ` Fabien DESSENNE
2018-05-15 8:27 ` Laurent Pinchart
2018-05-15 10:30 ` Mauro Carvalho Chehab
2018-05-15 16:24 ` Luis R. Rodriguez
2018-05-10 4:39 ` Yasunari.Takiguchi
2018-05-10 4:39 ` Yasunari.Takiguchi
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