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Subject[PATCH 4/7] writeback: Retry kupdate work early if we need to retry some inode writeback
From: Jan Kara <jack@suse.cz>

In case we could not do any writeback for some inodes, trigger next kupdate
work early so that writeback on these inodes is not delayed for the whole
dirty_writeback_interval.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
fs/fs-writeback.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)

--- linux-next.orig/fs/fs-writeback.c 2011-10-20 22:36:59.000000000 +0800
+++ linux-next/fs/fs-writeback.c 2011-10-20 22:42:24.000000000 +0800
@@ -886,7 +886,7 @@ static long wb_check_old_data_flush(stru

expired = wb->last_old_flush +
msecs_to_jiffies(dirty_writeback_interval * 10);
- if (time_before(jiffies, expired))
+ if (time_before(jiffies, expired) && list_empty(&wb->b_more_io_wait))
return 0;

wb->last_old_flush = jiffies;
@@ -958,6 +958,10 @@ int bdi_writeback_thread(void *data)
struct bdi_writeback *wb = data;
struct backing_dev_info *bdi = wb->bdi;
long progress;
+ unsigned int pause = 1;
+ unsigned int max_pause = dirty_writeback_interval ?
+ msecs_to_jiffies(dirty_writeback_interval * 10) :
+ HZ;

current->flags |= PF_SWAPWRITE;
set_freezable();
@@ -979,8 +983,10 @@ int bdi_writeback_thread(void *data)

progress = wb_do_writeback(wb, 0);

- if (progress)
+ if (progress) {
wb->last_active = jiffies;
+ pause = 1;
+ }

set_current_state(TASK_INTERRUPTIBLE);
if (!list_empty(&bdi->work_list) || kthread_should_stop()) {
@@ -988,8 +994,11 @@ int bdi_writeback_thread(void *data)
continue;
}

- if (wb_has_dirty_io(wb) && dirty_writeback_interval)
- schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10));
+ if (!list_empty(&wb->b_more_io_wait) && pause < max_pause) {
+ schedule_timeout(pause);
+ pause <<= 1;
+ } else if (wb_has_dirty_io(wb) && dirty_writeback_interval)
+ schedule_timeout(max_pause);
else {
/*
* We have nothing to do, so can go sleep without any



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