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author | Zi Yan <ziy@nvidia.com> | 2024-02-20 13:32:20 -0500 |
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committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-23 17:48:33 -0800 |
commit | 73318e2cafe53e8b7c8899d990cf8eaca32184d0 (patch) | |
tree | 219ecad644153bd343754a64c64ef631f7fa4b56 /net/xdp | |
parent | 733aea0b3a7bba0451dfc19322665de13a5b7af4 (diff) | |
download | linux-stable-73318e2cafe53e8b7c8899d990cf8eaca32184d0.tar.gz linux-stable-73318e2cafe53e8b7c8899d990cf8eaca32184d0.tar.bz2 linux-stable-73318e2cafe53e8b7c8899d990cf8eaca32184d0.zip |
mm/compaction: optimize >0 order folio compaction with free page split.
During migration in a memory compaction, free pages are placed in an array
of page lists based on their order. But the desired free page order
(i.e., the order of a source page) might not be always present, thus
leading to migration failures and premature compaction termination. Split
a high order free pages when source migration page has a lower order to
increase migration successful rate.
Note: merging free pages when a migration fails and a lower order free
page is returned via compaction_free() is possible, but there is too much
work. Since the free pages are not buddy pages, it is hard to identify
these free pages using existing PFN-based page merging algorithm.
Link: https://lkml.kernel.org/r/20240220183220.1451315-5-zi.yan@sent.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Adam Manzanares <a.manzanares@samsung.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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