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[ Upstream commit15d28d0d11] In the fast_find_migrateblock(), it iterates ocer the freelist to find the proper pageblock. But there are some misbehaviors. First, if the page we found is equal to cc->migrate_pfn, it is considered that we didn't find a suitable pageblock. Secondly, if the loop was terminated because order is less than PAGE_ALLOC_COSTLY_ORDER, it could be considered that we found a suitable one. Thirdly, if the skip bit is set on the page block and we goto continue, it doesn't check nr_scanned. Fourthly, if the page block's skip bit is set, it checks that page block is the last of list, which is unnecessary. Link: https://lkml.kernel.org/r/20210128130411.6125-1-vvghjk1234@gmail.com Fixes:70b44595ea("mm, compaction: use free lists to quickly locate a migration source") Signed-off-by: Wonhyuk Yang <vvghjk1234@gmail.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.