From: Vlastimil Babka <vbabka@suse.cz>
To: David Rientjes <rientjes@google.com>, Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Zi Yan <zi.yan@cs.rutgers.edu>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@suse.com>,
Stefan Priebe <s.priebe@profihost.ag>
Subject: Re: [PATCH] mm, thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings
Date: Tue, 11 Sep 2018 10:51:12 +0200 [thread overview]
Message-ID: <21336327-2465-ba55-e721-4e48f782dff1@suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.21.1809101253080.177111@chino.kir.corp.google.com>
On 09/10/2018 10:08 PM, David Rientjes wrote:
> When Andrea brought this up, I suggested that the full solution would be a
> MPOL_F_HUGEPAGE flag that could define thp allocation policy -- the added
Can you elaborate on the semantics of this? You mean that a given vma
could now have two mempolicies, where one would be for hugepages only?
That's likely much more easy to suggest than to implement, with all uapi
consequences...
> benefit is that we could replace the thp "defrag" mode default by setting
> this as part of default_policy. Right now, MADV_HUGEPAGE users are
> concerned about (1) getting thp when system-wide it is not default and (2)
> additional fault latency when direct compaction is not default. They are
> not anticipating the degradation of remote access latency, so overloading
> the meaning of the mode is probably not a good idea.
>
next prev parent reply other threads:[~2018-09-11 8:51 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-07 13:05 Michal Hocko
2018-09-08 18:52 ` Stefan Priebe - Profihost AG
2018-09-10 7:39 ` Michal Hocko
2018-09-11 9:03 ` Vlastimil Babka
2018-09-10 20:08 ` David Rientjes
2018-09-10 20:22 ` Stefan Priebe - Profihost AG
2018-09-11 8:51 ` Vlastimil Babka [this message]
2018-09-11 11:56 ` Michal Hocko
2018-09-11 20:30 ` David Rientjes
2018-09-12 12:05 ` Michal Hocko
2018-09-12 20:40 ` David Rientjes
2018-09-12 13:54 ` Andrea Arcangeli
2018-09-12 14:21 ` Michal Hocko
2018-09-12 15:25 ` Michal Hocko
-- strict thread matches above, loose matches on Subject: below --
2018-08-23 10:52 [PATCH 2/2] mm: thp: fix transparent_hugepage/defrag = madvise || always Michal Hocko
2018-08-28 7:53 ` Michal Hocko
2018-08-28 8:18 ` Michal Hocko
[not found] ` <D5F4A33C-0A37-495C-9468-D6866A862097@cs.rutgers.edu>
2018-08-29 14:28 ` Michal Hocko
2018-08-29 14:35 ` Michal Hocko
2018-08-29 15:22 ` Zi Yan
2018-08-29 15:47 ` Michal Hocko
2018-08-29 16:06 ` Zi Yan
2018-08-29 16:25 ` Michal Hocko
2018-08-29 19:24 ` [PATCH] mm, thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings Michal Hocko
2018-08-29 22:54 ` Zi Yan
2018-08-30 7:00 ` Michal Hocko
2018-08-30 13:22 ` Zi Yan
2018-08-30 13:45 ` Michal Hocko
2018-08-30 14:02 ` Zi Yan
2018-08-30 16:19 ` Stefan Priebe - Profihost AG
2018-08-30 16:40 ` Michal Hocko
2018-09-05 3:44 ` Andrea Arcangeli
2018-09-05 7:08 ` Michal Hocko
2018-09-06 11:10 ` Vlastimil Babka
2018-09-06 11:16 ` Vlastimil Babka
2018-09-06 11:25 ` Michal Hocko
2018-09-06 12:35 ` Zi Yan
2018-09-06 10:59 ` Vlastimil Babka
2018-09-06 11:17 ` Zi Yan
2018-08-30 6:47 ` Michal Hocko
2018-09-06 11:18 ` Vlastimil Babka
2018-09-06 11:27 ` Michal Hocko
2018-09-12 17:29 ` Mel Gorman
2018-09-17 6:11 ` Michal Hocko
2018-09-17 7:04 ` Stefan Priebe - Profihost AG
2018-09-17 9:32 ` Stefan Priebe - Profihost AG
2018-09-17 11:27 ` Michal Hocko
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