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| author | Jens Axboe <jens.axboe@oracle.com> | 2010-05-21 20:00:35 +0200 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2012-03-17 11:14:47 +0100 |
| commit | 050539021e2540f5018ec6e026ff381af287cfcb (patch) | |
| tree | 060ed9f78b6744e1cc45919b2727c6061188aa42 /mm | |
| parent | d9a25c03a1defab08703a7cc186a68aa2610ad4f (diff) | |
| download | lwn-050539021e2540f5018ec6e026ff381af287cfcb.tar.gz lwn-050539021e2540f5018ec6e026ff381af287cfcb.zip | |
writeback: fixups for !dirty_writeback_centisecs
commit 6423104b6a1e6f0c18be60e8c33f02d263331d5e upstream.
Commit 69b62d01 fixed up most of the places where we would enter
busy schedule() spins when disabling the periodic background
writeback. This fixes up the sb timer so that it doesn't get
hammered on with the delay disabled, and ensures that it gets
rearmed if needed when /proc/sys/vm/dirty_writeback_centisecs
gets modified.
bdi_forker_task() also needs to check for !dirty_writeback_centisecs
and use schedule() appropriately, fix that up too.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Tested-by: Xavier Roche <roche@httrack.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/backing-dev.c | 15 | ||||
| -rw-r--r-- | mm/page-writeback.c | 1 |
2 files changed, 11 insertions, 5 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 67a33a5a1a93..d82440108131 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -41,7 +41,6 @@ static struct timer_list sync_supers_timer; static int bdi_sync_supers(void *); static void sync_supers_timer_fn(unsigned long); -static void arm_supers_timer(void); static void bdi_add_default_flusher_task(struct backing_dev_info *bdi); @@ -242,7 +241,7 @@ static int __init default_bdi_init(void) init_timer(&sync_supers_timer); setup_timer(&sync_supers_timer, sync_supers_timer_fn, 0); - arm_supers_timer(); + bdi_arm_supers_timer(); err = bdi_init(&default_backing_dev_info); if (!err) @@ -364,10 +363,13 @@ static int bdi_sync_supers(void *unused) return 0; } -static void arm_supers_timer(void) +void bdi_arm_supers_timer(void) { unsigned long next; + if (!dirty_writeback_interval) + return; + next = msecs_to_jiffies(dirty_writeback_interval * 10) + jiffies; mod_timer(&sync_supers_timer, round_jiffies_up(next)); } @@ -375,7 +377,7 @@ static void arm_supers_timer(void) static void sync_supers_timer_fn(unsigned long unused) { wake_up_process(sync_supers_tsk); - arm_supers_timer(); + bdi_arm_supers_timer(); } static int bdi_forker_task(void *ptr) @@ -418,7 +420,10 @@ static int bdi_forker_task(void *ptr) spin_unlock_bh(&bdi_lock); wait = msecs_to_jiffies(dirty_writeback_interval * 10); - schedule_timeout(wait); + if (wait) + schedule_timeout(wait); + else + schedule(); try_to_freeze(); continue; } diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 2c5d79236ead..52f71aebfc01 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -694,6 +694,7 @@ int dirty_writeback_centisecs_handler(ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { proc_dointvec(table, write, buffer, length, ppos); + bdi_arm_supers_timer(); return 0; } |