[PATCH] Zone reclaim: proc override

[linux-2.6] / kernel / sysctl.c

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index a85047bb5739f97763345bc9ef047e0fe043f33c..cb99a42f8b37c60e991332ce33b4fba1dacb9dc6 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -25,6 +25,7 @@
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/proc_fs.h>
+#include <linux/capability.h>
 #include <linux/ctype.h>
 #include <linux/utsname.h>
 #include <linux/capability.h>
@@ -68,6 +69,8 @@ extern int min_free_kbytes;
 extern int printk_ratelimit_jiffies;
 extern int printk_ratelimit_burst;
 extern int pid_max_min, pid_max_max;
+extern int sysctl_drop_caches;
+extern int percpu_pagelist_fraction;
 
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 int unknown_nmi_panic;
@@ -78,6 +81,7 @@ extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 static int maxolduid = 65535;
 static int minolduid;
+static int min_percpu_pagelist_fract = 8;
 
 static int ngroups_max = NGROUPS_MAX;
 
@@ -644,7 +648,7 @@ static ctl_table kern_table[] = {
                .mode           = 0644,
                .proc_handler   = &proc_dointvec,
        },
-#if defined(CONFIG_S390)
+#if defined(CONFIG_S390) && defined(CONFIG_SMP)
        {
                .ctl_name       = KERN_SPIN_RETRY,
                .procname       = "spin_retry",
@@ -774,6 +778,15 @@ static ctl_table vm_table[] = {
                .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
                .strategy       = &sysctl_intvec,
        },
+       {
+               .ctl_name       = VM_DROP_PAGECACHE,
+               .procname       = "drop_caches",
+               .data           = &sysctl_drop_caches,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = drop_caches_sysctl_handler,
+               .strategy       = &sysctl_intvec,
+       },
        {
                .ctl_name       = VM_MIN_FREE_KBYTES,
                .procname       = "min_free_kbytes",
@@ -784,6 +797,16 @@ static ctl_table vm_table[] = {
                .strategy       = &sysctl_intvec,
                .extra1         = &zero,
        },
+       {
+               .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
+               .procname       = "percpu_pagelist_fraction",
+               .data           = &percpu_pagelist_fraction,
+               .maxlen         = sizeof(percpu_pagelist_fraction),
+               .mode           = 0644,
+               .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
+               .strategy       = &sysctl_intvec,
+               .extra1         = &min_percpu_pagelist_fract,
+       },
 #ifdef CONFIG_MMU
        {
                .ctl_name       = VM_MAX_MAP_COUNT,
@@ -846,6 +869,17 @@ static ctl_table vm_table[] = {
                .proc_handler   = &proc_dointvec_jiffies,
                .strategy       = &sysctl_jiffies,
        },
+#endif
+#ifdef CONFIG_NUMA
+       {
+               .ctl_name       = VM_ZONE_RECLAIM_MODE,
+               .procname       = "zone_reclaim_mode",
+               .data           = &zone_reclaim_mode,
+               .maxlen         = sizeof(zone_reclaim_mode),
+               .mode           = 0644,
+               .proc_handler   = &proc_dointvec,
+               .strategy       = &zero,
+       },
 #endif
        { .ctl_name = 0 }
 };