Chris Down [off-list ref] 于2021年8月13日周五 下午8:36写道：

yongw.pur-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org writes:

quoted

From: wangyong <redacted>
Inspired by PSI features, vmpressure inotifier function should also be
configured to decide whether it is used, because it is an independent
feature which notifies the user of memory pressure.

Since the vmpressure interface is used in kernel common code, for
users who do not use the vmpressure function, there will be
additional overhead.

Could you please demonstrate this additional overhead with profiles or
demonstrations of other real world effects? Thanks.

Thanks for your reply. In terms of code, it will reduce the operation
of some code.

To  demonstrate this additional overhead, It is planned to use lmbench and
Christoph Lamenter’s pagefault tool  (https://lkml.org/lkml/2006/8/29/294)
for comparative testing.

Thanks.