Introduce dirty_volatile_interval for the minimal dirty time.
Inodes dirtied less than dirty_volatile_interval will not be
considered for syncing by kupdate-style writeback.
This new parameter will be used in clustered writeback.
The old dirty_expire_interval is still(but less) respected.
Cc: Chris Mason <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: David Chinner <[email protected]>
Cc: Ken Chen <[email protected]>
Cc: Michael Rubin <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Fengguang Wu <[email protected]>
---
include/linux/writeback.h | 1 +
kernel/sysctl.c | 7 +++++++
mm/page-writeback.c | 5 +++++
3 files changed, 13 insertions(+)
--- linux-2.6.23-rc3-mm1.orig/include/linux/writeback.h
+++ linux-2.6.23-rc3-mm1/include/linux/writeback.h
@@ -101,6 +101,7 @@ extern int dirty_background_ratio;
extern int vm_dirty_ratio;
extern int dirty_writeback_interval;
extern int dirty_expire_interval;
+extern int dirty_volatile_interval;
extern int block_dump;
extern int laptop_mode;
--- linux-2.6.23-rc3-mm1.orig/mm/page-writeback.c
+++ linux-2.6.23-rc3-mm1/mm/page-writeback.c
@@ -85,6 +85,11 @@ int dirty_writeback_interval = 5 * HZ;
int dirty_expire_interval = 30 * HZ;
/*
+ * The shortest number of jiffies for which data should remain dirty
+ */
+int dirty_volatile_interval = 5 * HZ;
+
+/*
* Flag that makes the machine dump writes/reads and block dirtyings.
*/
int block_dump;
--- linux-2.6.23-rc3-mm1.orig/kernel/sysctl.c
+++ linux-2.6.23-rc3-mm1/kernel/sysctl.c
@@ -837,6 +837,13 @@ static struct ctl_table vm_table[] = {
.proc_handler = &proc_dointvec_userhz_jiffies,
},
{
+ .procname = "dirty_volatile_centisecs",
+ .data = &dirty_volatile_interval,
+ .maxlen = sizeof(dirty_volatile_interval),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_userhz_jiffies,
+ },
+ {
.ctl_name = VM_NR_PDFLUSH_THREADS,
.procname = "nr_pdflush_threads",
.data = &nr_pdflush_threads,
--
-
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