On Fri, Aug 14, 2020 at 12:19 AM Alex Shi [off-list ref] wrote:

在 2020/8/13 下午12:02, Alexander Duyck 写道:

quoted

Since we have dropped the late abort case we can drop the code that was
clearing the LRU flag and calling page_put since the abort case will now
not be holding a reference to a page.

Signed-off-by: Alexander Duyck <alexander.h.duyck-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

seems the case-lru-file-mmap-read case drop about 3% on this patch in a rough testing.
on my 80 core machine.

I'm not sure how it could have that much impact on the performance
since the total effect would just be dropping what should be a
redundant test since we tested the skip bit before we took the LRU
bit, so we shouldn't need to test it again after.

I finally got my test setup working last night. I'll have to do some
testing in my environment and I can start trying to see what is going
on.

Thanks.

- Alex