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@xxxxxxxxxxxxxx/ Cc: Nhat Pham <nphamcs@xxxxxxxxx> Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx> Signed-off-by: Mike Yuan <me@xxxxxxxxxxx> --- 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
