linux-kernel - [PATCH 0/3] mm: zswap: global shrinker fix and proactive shrink

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Date: Tue, 28 May 2024 04:34:01 +0000
From: Takero Funaki <flintglass@...il.com>
To: flintglass@...il.com,
	Johannes Weiner <hannes@...xchg.org>,
	Yosry Ahmed <yosryahmed@...gle.com>,
	Nhat Pham <nphamcs@...il.com>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Domenico Cerasuolo <cerasuolodomenico@...il.com>
Cc: linux-mm@...ck.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] mm: zswap: global shrinker fix and proactive shrink

Hello,

This series addresses two issues and introduces a minor improvement in
the zswap global shrinker:

1. Fix the memcg iteration logic that breaks iteration on offline
memcgs.
2. Fix the error path that aborts on expected error codes.
3. Add proactive shrinking at 95% full, for 90% accept threshold.

These patches need to be applied in this order to avoid potential loops
caused by the first issue. Patch 3 can be applied independently, but the
two issues must be resolved to ensure the shrinker can evict pages.

With this series applied, the shrinker will continue to evict pages
until accept_threshold_percent proactively as documented in patch 3. As
a side effect of changes in the hysteresis logic, zswap will no longer
reject pages under the max pool limit.

Regards,
Takero Funaki <flintglass@...il.com>

Takero Funaki (3):
  mm: zswap: fix global shrinker memcg iteration
  mm: zswap: fix global shrinker error handling logic
  mm: zswap: proactive shrinking before pool size limit is hit

 Documentation/admin-guide/mm/zswap.rst |  17 ++-
 mm/zswap.c                             | 156 ++++++++++++++++++-------
 2 files changed, 119 insertions(+), 54 deletions(-)

-- 
2.43.0