Commit 58143465 authored Oct 08, 2024 by Chen Ridong Committed by Tejun Heo Oct 08, 2024

workqueue: Adjust WQ_MAX_ACTIVE from 512 to 2048



WQ_MAX_ACTIVE is currently set to 512, which was established approximately
15 yeas ago. However, with the significant increase in machine sizes and
capabilities, the previous limit of 256 concurrent tasks is no longer
sufficient. Therefore, we propose to increase WQ_MAX_ACTIVE to 2048.
and WQ_DFL_ACTIVE is 1024 now.

Signed-off-by: Chen Ridong <chenridong@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

parent e3dddcfd

Documentation/core-api/workqueue.rst

+2 −2

Original line number	Diff line number	Diff line
		@@ -245,8 +245,8 @@ CPU which can be assigned to the work items of a wq. For example, with
		at the same time per CPU. This is always a per-CPU attribute, even for
		unbound workqueues.

		The maximum limit for ``@max_active`` is 512 and the default value used
		when 0 is specified is 256. These values are chosen sufficiently high
		The maximum limit for ``@max_active`` is 2048 and the default value used
		when 0 is specified is 1024. These values are chosen sufficiently high
		such that they are not the limiting factor while providing protection in
		runaway cases.

include/linux/workqueue.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -412,7 +412,7 @@ enum wq_flags {
		};

		enum wq_consts {
		WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
		WQ_MAX_ACTIVE = 2048, /* I like 2048, better ideas? */
		WQ_UNBOUND_MAX_ACTIVE = WQ_MAX_ACTIVE,
		WQ_DFL_ACTIVE = WQ_MAX_ACTIVE / 2,