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SubjectRe: [PATCH 0/2] Add a new scheme to support demotion on tiered memory system
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Hi Baolin,

On Tue, 21 Dec 2021 17:18:02 +0800 Baolin Wang <baolin.wang@linux.alibaba.com> wrote:

> Hi,
>
> 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.

I like the idea, thank you for these patches! If possible, could you share
some details about your tests?


Thanks,
SJ

>
>
> Baolin Wang (2):
> mm: Export the alloc_demote_page() function
> mm/damon: Add a new scheme to support demotion on tiered memory system
>
> include/linux/damon.h | 3 +
> mm/damon/dbgfs.c | 1 +
> mm/damon/vaddr.c | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++
> mm/internal.h | 1 +
> mm/vmscan.c | 2 +-
> 5 files changed, 162 insertions(+), 1 deletion(-)
>
> --
> 1.8.3.1

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