linux-kernel - [PATCH v3 3/3] Documentation/cgroup-v2: clarify that zswap.writeback is ignored if zswap is disabled

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Message-ID: <20240823162506.12117-3-me@yhndnzj.com>
Date: Fri, 23 Aug 2024 16:27:11 +0000
From: Mike Yuan <me@...dnzj.com>
To: linux-kernel@...r.kernel.org
Cc: Mike Yuan <me@...dnzj.com>, linux-mm@...ck.org, cgroups@...r.kernel.org, Nhat Pham <nphamcs@...il.com>, Yosry Ahmed <yosryahmed@...gle.com>, Johannes Weiner <hannes@...xchg.org>, Andrew Morton <akpm@...ux-foundation.org>, Muchun Song <muchun.song@...ux.dev>, Shakeel Butt <shakeel.butt@...ux.dev>, Roman Gushchin <roman.gushchin@...ux.dev>, Michal Hocko <mhocko@...nel.org>
Subject: [PATCH v3 3/3] Documentation/cgroup-v2: clarify that zswap.writeback is ignored if zswap is disabled

As discussed in [1], zswap-related settings natually
lose their effect when zswap is disabled, specifically
zswap.writeback here. Be explicit about this behavior.

[1] https://lore.kernel.org/linux-kernel/CAKEwX=Mhbwhh-=xxCU-RjMXS_n=RpV3Gtznb2m_3JgL+jzz++g@mail.gmail.com/

Cc: Nhat Pham <nphamcs@...il.com>
Cc: Yosry Ahmed <yosryahmed@...gle.com>

Signed-off-by: Mike Yuan <me@...dnzj.com>
---
 Documentation/admin-guide/cgroup-v2.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 95c18bc17083..a1723e402596 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1731,6 +1731,8 @@ The following nested keys are defined.
 
 	Note that this is subtly different from setting memory.swap.max to
 	0, as it still allows for pages to be written to the zswap pool.
+	This setting has no effect if zswap is disabled, and swapping
+	would be allowed unless memory.swap.max is set to 0.
 
   memory.pressure
 	A read-only nested-keyed file.
-- 
2.46.0