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| author | Mel Gorman <mgorman@techsingularity.net> | 2016-07-28 15:45:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-28 16:07:41 -0700 |
| commit | 0f66114893997f781029c109b0974b7f61130df7 (patch) | |
| tree | ba197844fbdb8af581e4dc91d01d907408671528 /include | |
| parent | 599d0c954f91d0689c9bb421b5bc04ea02437a41 (diff) | |
| download | linux-stable-0f66114893997f781029c109b0974b7f61130df7.tar.gz linux-stable-0f66114893997f781029c109b0974b7f61130df7.tar.bz2 linux-stable-0f66114893997f781029c109b0974b7f61130df7.zip | |
mm, mmzone: clarify the usage of zone padding
Zone padding separates write-intensive fields used by page allocation,
compaction and vmstats but the comments are a little misleading and need
clarification.
Link: http://lkml.kernel.org/r/1467970510-21195-5-git-send-email-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mmzone.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index d4f5cac0a8c3..edafdaf62e90 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -477,20 +477,21 @@ struct zone { unsigned long wait_table_hash_nr_entries; unsigned long wait_table_bits; + /* Write-intensive fields used from the page allocator */ ZONE_PADDING(_pad1_) + /* free areas of different sizes */ struct free_area free_area[MAX_ORDER]; /* zone flags, see below */ unsigned long flags; - /* Write-intensive fields used from the page allocator */ + /* Primarily protects free_area */ spinlock_t lock; + /* Write-intensive fields used by compaction and vmstats. */ ZONE_PADDING(_pad2_) - /* Write-intensive fields used by page reclaim */ - /* * When free pages are below this point, additional steps are taken * when reading the number of free pages to avoid per-cpu counter |