linux-kernel - [PATCH v2 0/2] mm: zswap: add per-memcg stat for incompressible pages

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Message-ID: <20260206072220.144008-1-jiayuan.chen@linux.dev>
Date: Fri,  6 Feb 2026 15:22:14 +0800
From: Jiayuan Chen <jiayuan.chen@...ux.dev>
To: linux-mm@...ck.org
Cc: Jiayuan Chen <jiayuan.chen@...ux.dev>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	Jonathan Corbet <corbet@....net>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yosry Ahmed <yosry.ahmed@...ux.dev>,
	Nhat Pham <nphamcs@...il.com>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Shuah Khan <shuah@...nel.org>,
	cgroups@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH v2 0/2] mm: zswap: add per-memcg stat for incompressible pages

In containerized environments, knowing which cgroup is contributing
incompressible pages to zswap is essential for effective resource
management. This series adds a new per-memcg stat 'zswap_incomp' to
track incompressible pages, along with a selftest.

Patch 1: Add the per-memcg zswap_incomp stat and documentation
Patch 2: Add selftest for the new stat

Changes v1 -> v2:
https://lore.kernel.org/linux-mm/20260205053013.25134-1-jiayuan.chen@linux.dev/

- Rename zswpraw/MEMCG_ZSWAP_RAW to zswap_incomp/MEMCG_ZSWAP_INCOMP
  (Shakeel Butt, Yosry Ahmed)
- Drop zswap_is_incomp() helper, keep opencode (size == PAGE_SIZE) with
  comments explaining the incompressibility check (Yosry Ahmed)
- Add documentation in cgroup-v2.rst (Nhat Pham, SeongJae Park)
- Add selftest as a separate patch (Nhat Pham)
- Add reference link to Chris Li's discussion on the need for per-memcg
  incompressible page tracking (Nhat Pham)

Jiayuan Chen (2):
  mm: zswap: add per-memcg stat for incompressible pages
  selftests/cgroup: add test for zswap incompressible pages

 Documentation/admin-guide/cgroup-v2.rst     |  5 ++
 include/linux/memcontrol.h                  |  1 +
 mm/memcontrol.c                             |  8 ++
 tools/testing/selftests/cgroup/test_zswap.c | 96 +++++++++++++++++++++
 4 files changed, 110 insertions(+)

-- 
2.43.0