From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Michal Hocko <mhocko@suse.com>, Balbir Singh <bsingharora@gmail.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com,
paulmck@linux.vnet.ibm.com, srikar@linux.vnet.ibm.com,
haren@linux.vnet.ibm.com, jglisse@redhat.com,
mgorman@techsingularity.net, arbab@linux.vnet.ibm.com,
vbabka@suse.cz, cl@linux.com
Subject: Re: [RFC 0/4] RFC - Coherent Device Memory (Not for inclusion)
Date: Thu, 04 May 2017 17:49:21 +0200 [thread overview]
Message-ID: <1493912961.25766.379.camel@kernel.crashing.org> (raw)
In-Reply-To: <20170504125250.GH31540@dhcp22.suse.cz>
On Thu, 2017-05-04 at 14:52 +0200, Michal Hocko wrote:
> But the direct reclaim would be effective only _after_ all other nodes
> are full.
>
> I thought that kswapd reclaim is a problem because the HW doesn't
> support aging properly but as the direct reclaim works then what is the
> actual problem?
Ageing isn't isn't completely broken. The ATS MMU supports
dirty/accessed just fine.
However the TLB invalidations are quite expensive with a GPU so too
much harvesting is detrimental, and the GPU tends to check pages out
using a special "read with intend to write" mode, which means it almost
always set the dirty bit if the page is writable to begin with.
Cheers,
Ben.
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next prev parent reply other threads:[~2017-05-04 15:49 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-19 7:52 [RFC 0/4] RFC - Coherent Device Memory (Not for inclusion) Balbir Singh
2017-04-19 7:52 ` [RFC 1/4] mm: create N_COHERENT_MEMORY Balbir Singh
2017-04-27 18:42 ` Reza Arbab
2017-04-28 5:07 ` Balbir Singh
2017-04-19 7:52 ` [RFC 2/4] arch/powerpc/mm: add support for coherent memory Balbir Singh
2017-04-19 7:52 ` [RFC 3/4] mm: Integrate N_COHERENT_MEMORY with mempolicy and the rest of the system Balbir Singh
2017-04-19 7:52 ` [RFC 4/4] mm: Add documentation for coherent memory Balbir Singh
2017-04-19 19:02 ` [RFC 0/4] RFC - Coherent Device Memory (Not for inclusion) Christoph Lameter
2017-04-20 1:25 ` Balbir Singh
2017-04-20 15:29 ` Christoph Lameter
2017-04-20 21:26 ` Benjamin Herrenschmidt
2017-04-21 16:13 ` Christoph Lameter
2017-04-21 21:15 ` Benjamin Herrenschmidt
2017-04-24 13:57 ` Christoph Lameter
2017-04-24 0:20 ` Balbir Singh
2017-04-24 14:00 ` Christoph Lameter
2017-04-25 0:52 ` Balbir Singh
2017-05-01 20:41 ` John Hubbard
2017-05-01 21:04 ` Reza Arbab
2017-05-01 21:56 ` John Hubbard
2017-05-01 23:51 ` Reza Arbab
2017-05-01 23:58 ` John Hubbard
2017-05-02 0:04 ` Reza Arbab
2017-05-02 1:29 ` Balbir Singh
2017-05-02 5:47 ` John Hubbard
2017-05-02 7:23 ` Balbir Singh
2017-05-02 17:50 ` John Hubbard
2017-05-02 14:36 ` Michal Hocko
2017-05-04 5:26 ` Balbir Singh
2017-05-04 12:52 ` Michal Hocko
2017-05-04 15:49 ` Benjamin Herrenschmidt [this message]
2017-05-04 17:33 ` Dave Hansen
2017-05-05 3:17 ` Balbir Singh
2017-05-05 14:51 ` Dave Hansen
2017-05-05 7:49 ` Benjamin Herrenschmidt
2017-05-05 14:52 ` Michal Hocko
2017-05-05 15:57 ` Benjamin Herrenschmidt
2017-05-05 17:48 ` Jerome Glisse
2017-05-05 17:59 ` Benjamin Herrenschmidt
2017-05-09 11:36 ` Michal Hocko
2017-05-09 13:43 ` Benjamin Herrenschmidt
2017-05-15 12:55 ` Michal Hocko
2017-05-15 15:53 ` Christoph Lameter
2017-05-10 23:04 ` Balbir Singh
2017-05-09 7:51 ` Balbir Singh
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