[PATCH 4/8] mm: introduce cache_reclaim_s

[Xishi Qiu <qiuxishi@huawei.com>]

This patch introduces a parameters cache_reclaim_s. It is used to reclaim
page cache in circles.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
---
 include/linux/swap.h |    2 ++
 kernel/sysctl.c      |    8 ++++++++
 mm/vmscan.c          |    4 ++++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index dcbe1a3..bd85493 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -359,6 +359,8 @@ extern unsigned long vm_cache_limit_ratio_max;
 extern unsigned long vm_cache_limit_mbytes;
 extern unsigned long vm_cache_limit_mbytes_min;
 extern unsigned long vm_cache_limit_mbytes_max;
+extern unsigned long vm_cache_reclaim_s;
+extern unsigned long vm_cache_reclaim_s_min;
 extern int cache_limit_ratio_sysctl_handler(struct ctl_table *table, int write,
 			void __user *buffer, size_t *length, loff_t *ppos);
 extern int cache_limit_mbytes_sysctl_handler(struct ctl_table *table, int write,
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9bb6f38..a8a09c4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1290,6 +1290,14 @@ static struct ctl_table vm_table[] = {
 		.extra1		= &vm_cache_limit_mbytes_min,
 		.extra2		= &vm_cache_limit_mbytes_max,
 	},
+	{
+		.procname	= "cache_reclaim_s",
+		.data		= &vm_cache_reclaim_s,
+		.maxlen		= sizeof(vm_cache_reclaim_s),
+		.mode		= 0644,
+		.proc_handler	= proc_doulongvec_minmax,
+		.extra1		= &vm_cache_reclaim_s_min,
+	},
 #ifdef CONFIG_COMPACTION
 	{
 		.procname	= "compact_memory",
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 707d3e3..61cedfc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -137,6 +137,8 @@ unsigned long vm_cache_limit_ratio_max;
 unsigned long vm_cache_limit_mbytes __read_mostly;
 unsigned long vm_cache_limit_mbytes_min;
 unsigned long vm_cache_limit_mbytes_max;
+unsigned long vm_cache_reclaim_s __read_mostly;
+unsigned long vm_cache_reclaim_s_min;
 
 static LIST_HEAD(shrinker_list);
 static DECLARE_RWSEM(shrinker_rwsem);
@@ -3390,6 +3392,8 @@ static void shrink_page_cache_init(void)
 	vm_cache_limit_mbytes = 0;
 	vm_cache_limit_mbytes_min = 0;
 	vm_cache_limit_mbytes_max = totalram_pages;
+	vm_cache_reclaim_s = 0;
+	vm_cache_reclaim_s_min = 0;
 }
 
 static unsigned long __shrink_page_cache(gfp_t mask)
-- 
1.6.0.2


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