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Subject[-mm][PATCH 5/5] introduce sysctl parameter of max task of throttle
introduce sysctl parameter of max task of throttle.

<usage>
# echo 5 > /proc/sys/vm/max_nr_task_per_zone
</usage>


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>


---
include/linux/swap.h | 2 ++
kernel/sysctl.c | 9 +++++++++
mm/vmscan.c | 3 ++-
3 files changed, 13 insertions(+), 1 deletion(-)
Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c 2008-05-03 00:45:15.000000000 +0900
+++ b/mm/vmscan.c 2008-05-03 00:47:00.000000000 +0900
@@ -125,9 +125,10 @@ struct scan_control {
int vm_swappiness = 60;
long vm_total_pages; /* The total number of pages which the VM controls */

-#define MAX_RECLAIM_TASKS CONFIG_NR_MAX_RECLAIM_TASKS_PER_ZONE
+#define MAX_RECLAIM_TASKS vm_max_nr_task_per_zone
static LIST_HEAD(shrinker_list);
static DECLARE_RWSEM(shrinker_rwsem);
+int vm_max_nr_task_per_zone = CONFIG_NR_MAX_RECLAIM_TASKS_PER_ZONE;

#ifdef CONFIG_CGROUP_MEM_RES_CTLR
#define scan_global_lru(sc) (!(sc)->mem_cgroup)
Index: b/include/linux/swap.h
===================================================================
--- a/include/linux/swap.h 2008-05-03 00:22:33.000000000 +0900
+++ b/include/linux/swap.h 2008-05-03 00:47:00.000000000 +0900
@@ -206,6 +206,8 @@ static inline int zone_reclaim(struct zo

extern int kswapd_run(int nid);

+extern int vm_max_nr_task_per_zone;
+
#ifdef CONFIG_MMU
/* linux/mm/shmem.c */
extern int shmem_unuse(swp_entry_t entry, struct page *page);
Index: b/kernel/sysctl.c
===================================================================
--- a/kernel/sysctl.c 2008-05-03 00:22:33.000000000 +0900
+++ b/kernel/sysctl.c 2008-05-03 00:47:00.000000000 +0900
@@ -1150,6 +1150,15 @@ static struct ctl_table vm_table[] = {
.extra2 = &one,
},
#endif
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "max_nr_task_per_zone",
+ .data = &vm_max_nr_task_per_zone,
+ .maxlen = sizeof(vm_max_nr_task_per_zone),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ .strategy = &sysctl_intvec,
+ },
/*
* NOTE: do not add new entries to this table unless you have read
* Documentation/sysctl/ctl_unnumbered.txt



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