On 03.09.24 09:14, Rong Qianfeng wrote:
Hi David,
Thanks very much for the detailed comments and explanations!
在 2024/9/2 21:45, David Hildenbrand 写道:
On 02.09.24 14:24, Rong Qianfeng wrote:
Reserved pages are basically non-lru pages. This kind of memory can't be
used as migration sources and targets, skip it can bring some
performance
benefits.
Any numbers? :)
I am still thinking about how to design test cases. If you have any good
suggestions, please tell me. Thank you very much.
Well, you claim that it can bring performance improvement, so it's your
responsibility to prove it :)
I have real idea how you could measure that, sorry.
This change will make the code more complicated (and as raised, there
are some corner cases not handled yet). So it's better worth the price. :)
[...]
What about free_reserved_page() ? There might be more, though
(kimage_free_pages()). You have to take a look at all functions where we
clear PageReserved.
Thanks for your reminder, I found that I missed a lot of functions.
Maybe a better choice is to clear PB_migrate_skip in free_reserved_page()
to reduce the amount of modification.
Hm, maybe. At least for free_reserved_area() it would be beneficial to
minimize the per-page handling.
--
Cheers,
David / dhildenb
