From: Baolin Wang <baolin.wang@linux.alibaba.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: sj@kernel.org, ying.huang@intel.com, dave.hansen@linux.intel.com,
ziy@nvidia.com, shy828301@gmail.com,
zhongjiang-ali@linux.alibaba.com, xlpang@linux.alibaba.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/2] Add a new scheme to support demotion on tiered memory system
Date: Thu, 23 Dec 2021 09:01:05 +0800 [thread overview]
Message-ID: <362fb4fe-34c8-d83d-b8be-a4140e19b244@linux.alibaba.com> (raw)
In-Reply-To: <20211222160105.a267eaacefae77ae094c050e@linux-foundation.org>
On 12/23/2021 8:01 AM, Andrew Morton wrote:
> On Wed, 22 Dec 2021 19:14:39 +0800 Baolin Wang <baolin.wang@linux.alibaba.com> wrote:
>
>> Now on tiered memory system with different memory types, the reclaim path in
>> shrink_page_list() already support demoting pages to slow memory node instead
>> of discarding the pages. However, at that time the fast memory node memory
>> wartermark is already tense, which will increase the memory allocation latency
>> during page demotion. So a new method from user space demoting cold pages
>> proactively will be more helpful.
>>
>> We can rely on the DAMON in user space to help to monitor the cold memory on
>> fast memory node, and demote the cold pages to slow memory node proactively to
>> keep the fast memory node in a healthy state.
>>
>> This patch set introduces a new scheme named DAMOS_DEMOTE to support this feature,
>> and works well from my testing. Any comments are welcome. Thanks.
>
> This is interesting.
>
> I think it would be helpful if we could have some example scenarios in
> this changelog, help people understand how to use DAMOS_DEMOTE and what
> effects it has.
Sure.
>
> Documentation/admin-guide/mm/damon/usage.rst would like an update?
Ah, I missed updating de Doc, and will do in v3.
> And the DAMON user space tool?
Yes. Thanks for your comments.
next prev parent reply other threads:[~2021-12-23 1:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 11:14 [PATCH v2 0/2] Add a new scheme to support demotion on tiered memory system Baolin Wang
2021-12-22 11:14 ` [PATCH v2 1/2] mm: Export the demote_page_list() function Baolin Wang
2021-12-22 11:14 ` [PATCH v2 2/2] mm/damon: Add a new scheme to support demotion on tiered memory system Baolin Wang
2021-12-23 0:01 ` [PATCH v2 0/2] " Andrew Morton
2021-12-23 1:01 ` Baolin Wang [this message]
2021-12-23 1:07 ` Huang, Ying
2021-12-23 1:21 ` Baolin Wang
2021-12-23 3:22 ` Huang, Ying
2021-12-23 6:35 ` Baolin Wang
2021-12-23 7:51 ` Huang, Ying
2021-12-23 11:31 ` SeongJae Park
2021-12-27 3:09 ` Huang, Ying
2021-12-28 8:44 ` SeongJae Park
2021-12-29 1:33 ` Huang, Ying
2021-12-29 10:34 ` SeongJae Park
2021-12-30 3:16 ` Huang, Ying
2021-12-30 8:03 ` SeongJae Park
2021-12-30 9:31 ` Baolin Wang
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