Re: [PATCH v2 5/7] mm: thp: split huge page to any lower order pages.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 29.03.23 03:17, Zi Yan wrote:
From: Zi Yan <ziy@xxxxxxxxxx>

To split a THP to any lower order pages, we need to reform THPs on
subpages at given order and add page refcount based on the new page
order. Also we need to reinitialize page_deferred_list after removing
the page from the split_queue, otherwise a subsequent split will see
list corruption when checking the page_deferred_list again.

It has many uses, like minimizing the number of pages after
truncating a huge pagecache page. For anonymous THPs, we can only split
them to order-0 like before until we add support for any size anonymous
THPs.


Because I'm currently looking into something that would also not be compatible with order-1 for now:

You should make it clear that order-1 is not supported, like:

"mm: thp: split huge page to any lower order pages (except order 1)"

And clarify in the subject why that is the case.

--
Cheers,

David / dhildenb




[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux