[PATCH v2] Docs/mm/damon/design: remove the details for pageout as paddr doesn't use MADV_PAGEOUT

[PATCH v2] Docs/mm/damon/design: remove the details for pageout as paddr doesn't use MADV_PAGEOUT

[Barry Song]

From: Barry Song <v-songbaohua@oppo.com>

The doc needs fix. As only in the case of virtual address, we
are calling madvise() with MADV_PAGEOUT. But in the case of
physical address, we are calling reclaim_pages() directly.
MADV_PAGEOUT on virtual address is much more aggresive to
reclaim memory compared to reclaim_pages() on paddr region.
This patch removes the details so that the description can
apply to both cases. And we don't need to couple with the
implementation details.

Cc: SeongJae Park <sj@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
---
 -v2: decouple with the details according to SeongJae
 -v1: https://lore.kernel.org/linux-mm/20240224215023.5271-1-21cnbao@gmail.com/

 Documentation/mm/damon/design.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index 8c89d26f0baa..5620aab9b385 100644
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst
@@ -315,7 +315,7 @@ that supports each action are as below.
    Supported by ``vaddr`` and ``fvaddr`` operations set.
  - ``cold``: Call ``madvise()`` for the region with ``MADV_COLD``.
    Supported by ``vaddr`` and ``fvaddr`` operations set.
- - ``pageout``: Call ``madvise()`` for the region with ``MADV_PAGEOUT``.
+ - ``pageout``: Reclaim the region.
    Supported by ``vaddr``, ``fvaddr`` and ``paddr`` operations set.
  - ``hugepage``: Call ``madvise()`` for the region with ``MADV_HUGEPAGE``.
    Supported by ``vaddr`` and ``fvaddr`` operations set.
-- 
2.34.1

Re: [PATCH v2] Docs/mm/damon/design: remove the details for pageout as paddr doesn't use MADV_PAGEOUT

[SeongJae Park]

Hi Barry,

On Sun, 25 Feb 2024 11:47:51 +1300 Barry Song <21cnbao@gmail.com> wrote:

> From: Barry Song <v-songbaohua@oppo.com>
> 
> The doc needs fix. As only in the case of virtual address, we
> are calling madvise() with MADV_PAGEOUT. But in the case of
> physical address, we are calling reclaim_pages() directly.
> MADV_PAGEOUT on virtual address is much more aggresive to
> reclaim memory compared to reclaim_pages() on paddr region.
> This patch removes the details so that the description can
> apply to both cases. And we don't need to couple with the
> implementation details.
> 
> Cc: SeongJae Park <sj@kernel.org>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Barry Song <v-songbaohua@oppo.com>
> ---
>  -v2: decouple with the details according to SeongJae
>  -v1: https://lore.kernel.org/linux-mm/20240224215023.5271-1-21cnbao@gmail.com/

Thank you so much for your work!

Reviewed-by: SeongJae Park <sj@kernel.org>


Thanks,
SJ

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