extern struct wb_domain global_wb_domain;
/* These are exported to sysctl. */
-extern int dirty_background_ratio;
-extern unsigned long dirty_background_bytes;
-extern int vm_dirty_ratio;
-extern unsigned long vm_dirty_bytes;
extern unsigned int dirty_writeback_interval;
extern unsigned int dirty_expire_interval;
extern unsigned int dirtytime_expire_interval;
-extern int vm_highmem_is_dirtyable;
extern int laptop_mode;
-int dirty_background_ratio_handler(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
-int dirty_background_bytes_handler(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
-int dirty_ratio_handler(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
-int dirty_bytes_handler(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
int dirtytime_interval_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
-int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty);
unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh);
static const int six_hundred_forty_kb = 640 * 1024;
#endif
-/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
-static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
.extra1 = SYSCTL_ZERO,
},
{
- .procname = "dirty_background_ratio",
- .data = &dirty_background_ratio,
- .maxlen = sizeof(dirty_background_ratio),
- .mode = 0644,
- .proc_handler = dirty_background_ratio_handler,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE_HUNDRED,
- },
- {
- .procname = "dirty_background_bytes",
- .data = &dirty_background_bytes,
- .maxlen = sizeof(dirty_background_bytes),
- .mode = 0644,
- .proc_handler = dirty_background_bytes_handler,
- .extra1 = SYSCTL_LONG_ONE,
- },
- {
- .procname = "dirty_ratio",
- .data = &vm_dirty_ratio,
- .maxlen = sizeof(vm_dirty_ratio),
- .mode = 0644,
- .proc_handler = dirty_ratio_handler,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE_HUNDRED,
- },
- {
- .procname = "dirty_bytes",
- .data = &vm_dirty_bytes,
- .maxlen = sizeof(vm_dirty_bytes),
- .mode = 0644,
- .proc_handler = dirty_bytes_handler,
- .extra1 = (void *)&dirty_bytes_min,
- },
- {
- .procname = "dirty_writeback_centisecs",
- .data = &dirty_writeback_interval,
- .maxlen = sizeof(dirty_writeback_interval),
- .mode = 0644,
- .proc_handler = dirty_writeback_centisecs_handler,
- },
- {
- .procname = "dirty_expire_centisecs",
- .data = &dirty_expire_interval,
- .maxlen = sizeof(dirty_expire_interval),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- },
- {
.procname = "dirtytime_expire_seconds",
.data = &dirtytime_expire_interval,
.maxlen = sizeof(dirtytime_expire_interval),
},
#endif
{
- .procname = "laptop_mode",
- .data = &laptop_mode,
- .maxlen = sizeof(laptop_mode),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
.procname = "vfs_cache_pressure",
.data = &sysctl_vfs_cache_pressure,
.maxlen = sizeof(sysctl_vfs_cache_pressure),
.extra1 = SYSCTL_ZERO,
},
#endif
-#ifdef CONFIG_HIGHMEM
- {
- .procname = "highmem_is_dirtyable",
- .data = &vm_highmem_is_dirtyable,
- .maxlen = sizeof(vm_highmem_is_dirtyable),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
-#endif
#ifdef CONFIG_MEMORY_FAILURE
{
.procname = "memory_failure_early_kill",
/*
* Start background writeback (via writeback threads) at this percentage
*/
-int dirty_background_ratio = 10;
+static int dirty_background_ratio = 10;
/*
* dirty_background_bytes starts at 0 (disabled) so that it is a function of
* dirty_background_ratio * the amount of dirtyable memory
*/
-unsigned long dirty_background_bytes;
+static unsigned long dirty_background_bytes;
/*
* free highmem will not be subtracted from the total free memory
* for calculating free ratios if vm_highmem_is_dirtyable is true
*/
-int vm_highmem_is_dirtyable;
+static int vm_highmem_is_dirtyable;
/*
* The generator of dirty data starts writeback at this percentage
*/
-int vm_dirty_ratio = 20;
+static int vm_dirty_ratio = 20;
+
+/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
+static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
/*
* vm_dirty_bytes starts at 0 (disabled) so that it is a function of
* vm_dirty_ratio * the amount of dirtyable memory
*/
-unsigned long vm_dirty_bytes;
+static unsigned long vm_dirty_bytes;
/*
* The interval between `kupdate'-style writebacks
return nr_pages <= limit;
}
-int dirty_background_ratio_handler(struct ctl_table *table, int write,
+#ifdef CONFIG_SYSCTL
+static int dirty_background_ratio_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
return ret;
}
-int dirty_background_bytes_handler(struct ctl_table *table, int write,
+static int dirty_background_bytes_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
return ret;
}
-int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
+static int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int old_ratio = vm_dirty_ratio;
return ret;
}
-int dirty_bytes_handler(struct ctl_table *table, int write,
+static int dirty_bytes_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
unsigned long old_bytes = vm_dirty_bytes;
}
return ret;
}
+#endif
static unsigned long wp_next_time(unsigned long cur_time)
{
return false;
}
+#ifdef CONFIG_SYSCTL
/*
* sysctl handler for /proc/sys/vm/dirty_writeback_centisecs
*/
-int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
+static int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
void *buffer, size_t *length, loff_t *ppos)
{
unsigned int old_interval = dirty_writeback_interval;
return ret;
}
+#endif
void laptop_mode_timer_fn(struct timer_list *t)
{
return 0;
}
+#ifdef CONFIG_SYSCTL
+static struct ctl_table vm_page_writeback_sysctls[] = {
+ {
+ .procname = "dirty_background_ratio",
+ .data = &dirty_background_ratio,
+ .maxlen = sizeof(dirty_background_ratio),
+ .mode = 0644,
+ .proc_handler = dirty_background_ratio_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+ {
+ .procname = "dirty_background_bytes",
+ .data = &dirty_background_bytes,
+ .maxlen = sizeof(dirty_background_bytes),
+ .mode = 0644,
+ .proc_handler = dirty_background_bytes_handler,
+ .extra1 = SYSCTL_LONG_ONE,
+ },
+ {
+ .procname = "dirty_ratio",
+ .data = &vm_dirty_ratio,
+ .maxlen = sizeof(vm_dirty_ratio),
+ .mode = 0644,
+ .proc_handler = dirty_ratio_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+ {
+ .procname = "dirty_bytes",
+ .data = &vm_dirty_bytes,
+ .maxlen = sizeof(vm_dirty_bytes),
+ .mode = 0644,
+ .proc_handler = dirty_bytes_handler,
+ .extra1 = (void *)&dirty_bytes_min,
+ },
+ {
+ .procname = "dirty_writeback_centisecs",
+ .data = &dirty_writeback_interval,
+ .maxlen = sizeof(dirty_writeback_interval),
+ .mode = 0644,
+ .proc_handler = dirty_writeback_centisecs_handler,
+ },
+ {
+ .procname = "dirty_expire_centisecs",
+ .data = &dirty_expire_interval,
+ .maxlen = sizeof(dirty_expire_interval),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
+#ifdef CONFIG_HIGHMEM
+ {
+ .procname = "highmem_is_dirtyable",
+ .data = &vm_highmem_is_dirtyable,
+ .maxlen = sizeof(vm_highmem_is_dirtyable),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif
+ {
+ .procname = "laptop_mode",
+ .data = &laptop_mode,
+ .maxlen = sizeof(laptop_mode),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {}
+};
+#endif
+
/*
* Called early on to tune the page writeback dirty limits.
*
page_writeback_cpu_online, NULL);
cpuhp_setup_state(CPUHP_MM_WRITEBACK_DEAD, "mm/writeback:dead", NULL,
page_writeback_cpu_online);
+#ifdef CONFIG_SYSCTL
+ register_sysctl_init("vm", vm_page_writeback_sysctls);
+#endif
}
/**