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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 | |
| 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>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-node | 7 | ||||
| -rw-r--r-- | drivers/base/node.c | 3 | ||||
| -rw-r--r-- | include/linux/compaction.h | 16 | ||||
| -rw-r--r-- | mm/compaction.c | 23 |
4 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-node b/Documentation/ABI/testing/sysfs-devices-node new file mode 100644 index 000000000000..453a210c3ceb --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-node @@ -0,0 +1,7 @@ +What: /sys/devices/system/node/nodeX/compact +Date: February 2010 +Contact: Mel Gorman <mel@csn.ul.ie> +Description: + When this file is written to, all memory within that node + will be compacted. When it completes, memory will be freed + into blocks which have as many contiguous pages as possible diff --git a/drivers/base/node.c b/drivers/base/node.c index 057979a19eea..2bdd8a94ec94 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -9,6 +9,7 @@ #include <linux/memory.h> #include <linux/node.h> #include <linux/hugetlb.h> +#include <linux/compaction.h> #include <linux/cpumask.h> #include <linux/topology.h> #include <linux/nodemask.h> @@ -246,6 +247,8 @@ int register_node(struct node *node, int num, struct node *parent) scan_unevictable_register_node(node); hugetlb_register_node(node); + + compaction_register_node(node); } return error; } 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 */ diff --git a/mm/compaction.c b/mm/compaction.c index 77854fbc0f56..f61f77983ff4 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -13,6 +13,7 @@ #include <linux/mm_inline.h> #include <linux/backing-dev.h> #include <linux/sysctl.h> +#include <linux/sysfs.h> #include "internal.h" /* @@ -453,3 +454,25 @@ int sysctl_compaction_handler(struct ctl_table *table, int write, return 0; } + +#if defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) +ssize_t sysfs_compact_node(struct sys_device *dev, + struct sysdev_attribute *attr, + const char *buf, size_t count) +{ + compact_node(dev->id); + + return count; +} +static SYSDEV_ATTR(compact, S_IWUSR, NULL, sysfs_compact_node); + +int compaction_register_node(struct node *node) +{ + return sysdev_create_file(&node->sysdev, &attr_compact); +} + +void compaction_unregister_node(struct node *node) +{ + return sysdev_remove_file(&node->sysdev, &attr_compact); +} +#endif /* CONFIG_SYSFS && CONFIG_NUMA */ |