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

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Message-Id: <20240224224751.4673-1-21cnbao@gmail.com>
Date: Sun, 25 Feb 2024 11:47:51 +1300
From: Barry Song <21cnbao@...il.com>
To: corbet@....net,
	linux-mm@...ck.org,
	akpm@...ux-foundation.org,
	damon@...ts.linux.dev,
	linux-doc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Barry Song <v-songbaohua@...o.com>,
	SeongJae Park <sj@...nel.org>,
	Minchan Kim <minchan@...nel.org>,
	Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH v2] Docs/mm/damon/design: remove the details for pageout as paddr doesn't use MADV_PAGEOUT

From: Barry Song <v-songbaohua@...o.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@...nel.org>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Barry Song <v-songbaohua@...o.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