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docs: clarify that dirtytime_expire_seconds=0 disables writeback

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Document that setting vm.dirtytime_expire_seconds to zero disables
periodic dirtytime writeback, matching the behavior of the related
dirty_writeback_centisecs sysctl which already documents this.

Signed-off-by: Laveesh Bansal <laveeshb@laveeshbansal.com>
Link: https://patch.msgid.link/20260106145059.543282-3-laveeshb@laveeshbansal.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Laveesh Bansal 2026-01-06 14:50:59 +00:00 committed by Christian Brauner
parent 543467d6fe
commit 30ef9a20f1
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Documentation/admin-guide/sysctl/vm.rst
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@ -231,6 +231,8 @@ eventually gets pushed out to disk. This tunable is used to define when dirty
inode is old enough to be eligible for writeback by the kernel flusher threads.
And, it is also used as the interval to wakeup dirtytime_writeback thread.
Setting this to zero disables periodic dirtytime writeback.
dirty_writeback_centisecs
=========================