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| author | Mel Gorman <mel@csn.ul.ie> | 2010-05-24 14:32:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-25 08:06:59 -0700 |
| commit | ed4a6d7f0676db50b5023cc01f6cda82a2f2a307 (patch) | |
| tree | 6496343ba964e105cf30f8703714471f22edc806 /include/linux/compaction.h | |
| parent | 76ab0f530e4a01d4dc20cdc1d5e87753c579dc18 (diff) | |
| download | lwn-ed4a6d7f0676db50b5023cc01f6cda82a2f2a307.tar.gz lwn-ed4a6d7f0676db50b5023cc01f6cda82a2f2a307.zip | |
mm: compaction: add /sys trigger for per-node memory compaction
Add a per-node sysfs file called compact. When the file is written to,
each zone in that node is compacted. The intention that this would be
used by something like a job scheduler in a batch system before a job
starts so that the job can allocate the maximum number of hugepages
without significant start-up cost.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compaction.h')
| -rw-r--r-- | include/linux/compaction.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/compaction.h b/include/linux/compaction.h index 572388880ba8..ba98cfe0ae15 100644 --- a/include/linux/compaction.h +++ b/include/linux/compaction.h @@ -12,4 +12,20 @@ extern int sysctl_compaction_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos); #endif /* CONFIG_COMPACTION */ +#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) +extern int compaction_register_node(struct node *node); +extern void compaction_unregister_node(struct node *node); + +#else + +static inline int compaction_register_node(struct node *node) +{ + return 0; +} + +static inline void compaction_unregister_node(struct node *node) +{ +} +#endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */ + #endif /* _LINUX_COMPACTION_H */ |