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From: "Huang\, Ying" <ying.huang@intel.com>
To: David Rientjes <rientjes@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
	 Yang Shi <yang.shi@linux.alibaba.com>,
	 Dave Hansen <dave.hansen@linux.intel.com>,
	 <linux-kernel@vger.kernel.org>,  <linux-mm@kvack.org>,
	 <kbusch@kernel.org>,  <dan.j.williams@intel.com>
Subject: Re: [RFC][PATCH 3/8] mm/vmscan: Attempt to migrate page in lieu of discard
Date: Thu, 02 Jul 2020 09:50:51 +0800
Message-ID: <87v9j6k7lw.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <alpine.DEB.2.23.453.2007011248580.1908531@chino.kir.corp.google.com> (David Rientjes's message of "Wed, 1 Jul 2020 12:50:23 -0700")

David Rientjes <rientjes@google.com> writes:

> On Wed, 1 Jul 2020, Dave Hansen wrote:
>
>> Even if they don't allocate directly from PMEM, is it OK for such an app
>> to get its cold data migrated to PMEM?  That's a much more subtle
>> question and I suspect the kernel isn't going to have a single answer
>> for it.  I suspect we'll need a cpuset-level knob to turn auto-demotion
>> on or off.
>> 
>
> I think the answer is whether the app's cold data can be reclaimed, 
> otherwise migration to PMEM is likely better in terms of performance.  So 
> any such app today should just be mlocking its cold data if it can't 
> handle overhead from reclaim?

Yes.  That's a way to solve the problem.  A cpuset-level knob may be
more flexible, because you don't need to change the application source
code.

Best Regards,
Huang, Ying


  reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 23:45 [RFC][PATCH 0/8] Migrate Pages " Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 1/8] mm/numa: node demotion data structure and lookup Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 2/8] mm/migrate: Defer allocating new page until needed Dave Hansen
2020-07-01  8:47   ` Greg Thelen
2020-07-01 14:46     ` Dave Hansen
2020-07-01 18:32       ` Yang Shi
2020-06-29 23:45 ` [RFC][PATCH 3/8] mm/vmscan: Attempt to migrate page in lieu of discard Dave Hansen
2020-07-01  0:47   ` David Rientjes
2020-07-01  1:29     ` Yang Shi
2020-07-01  5:41       ` David Rientjes
2020-07-01  8:54         ` Huang, Ying
2020-07-01 18:20           ` Dave Hansen
2020-07-01 19:50             ` David Rientjes
2020-07-02  1:50               ` Huang, Ying [this message]
2020-07-01 15:15         ` Dave Hansen
2020-07-01 17:21         ` Yang Shi
2020-07-01 19:45           ` David Rientjes
2020-07-02 10:02             ` Jonathan Cameron
2020-07-01  1:40     ` Huang, Ying
2020-07-01 16:48     ` Dave Hansen
2020-07-01 19:25       ` David Rientjes
2020-07-02  5:02         ` Huang, Ying
2020-06-29 23:45 ` [RFC][PATCH 4/8] mm/vmscan: add page demotion counter Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 5/8] mm/numa: automatically generate node migration order Dave Hansen
2020-06-30  8:22   ` Huang, Ying
2020-07-01 18:23     ` Dave Hansen
2020-07-02  1:20       ` Huang, Ying
2020-06-29 23:45 ` [RFC][PATCH 6/8] mm/vmscan: Consider anonymous pages without swap Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 7/8] mm/vmscan: never demote for memcg reclaim Dave Hansen
2020-06-29 23:45 ` [RFC][PATCH 8/8] mm/numa: new reclaim mode to enable reclaim-based migration Dave Hansen
2020-06-30  7:23   ` Huang, Ying
2020-06-30 17:50     ` Yang Shi
2020-07-01  0:48       ` Huang, Ying
2020-07-01  1:12         ` Yang Shi
2020-07-01  1:28           ` Huang, Ying
2020-07-01 16:02       ` Dave Hansen
2020-07-03  9:30   ` Huang, Ying
2020-06-30 18:36 ` [RFC][PATCH 0/8] Migrate Pages in lieu of discard Shakeel Butt
2020-06-30 18:51   ` Dave Hansen
2020-06-30 19:25     ` Shakeel Butt
2020-06-30 19:31       ` Dave Hansen
2020-07-01 14:24         ` [RFC] [PATCH " Zi Yan
2020-07-01 14:32           ` Dave Hansen

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