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ext4: Use schedule_timeout_interruptible() for waiting in lazyinit thread

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In order to make lazyinit eat approx. 10% of io bandwidth at max, we
are sleeping between zeroing each single inode table. For that purpose
we are using timer which wakes up thread when it expires. It is set
via add_timer() and this may cause troubles in the case that thread
has been woken up earlier and in next iteration we call add_timer() on
still running timer hence hitting BUG_ON in add_timer(). We could fix
that by using mod_timer() instead however we can use
schedule_timeout_interruptible() for waiting and hence simplifying
things a lot.

This commit exchange the old "waiting mechanism" with simple
schedule_timeout_interruptible(), setting the time to sleep. Hence we
do not longer need li_wait_daemon waiting queue and others, so get rid
of it.

Addresses-Red-Hat-Bugzilla: #699708

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Lukas Czerner 2011-05-20 13:49:04 -04:00 committed by Theodore Ts'o
parent 0e499890c1
commit 4ed5c033c1
2 changed files with 6 additions and 29 deletions
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4
fs/ext4/ext4.h
View File

@ -1605,12 +1605,8 @@ void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
*/
struct ext4_lazy_init {
unsigned long li_state;
wait_queue_head_t li_wait_daemon;
wait_queue_head_t li_wait_task;
struct timer_list li_timer;
struct task_struct *li_task;
struct list_head li_request_list;
struct mutex li_list_mtx;
};

31
fs/ext4/super.c
View File

@ -2673,12 +2673,6 @@ static void print_daily_error_info(unsigned long arg)
mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
}
static void ext4_lazyinode_timeout(unsigned long data)
{
struct task_struct *p = (struct task_struct *)data;
wake_up_process(p);
}
/* Find next suitable group and run ext4_init_inode_table */
static int ext4_run_li_request(struct ext4_li_request *elr)
{
@ -2726,7 +2720,7 @@ static int ext4_run_li_request(struct ext4_li_request *elr)
/*
* Remove lr_request from the list_request and free the
* request tructure. Should be called with li_list_mtx held
* request structure. Should be called with li_list_mtx held
*/
static void ext4_remove_li_request(struct ext4_li_request *elr)
{
@ -2770,14 +2764,10 @@ static int ext4_lazyinit_thread(void *arg)
struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
struct list_head *pos, *n;
struct ext4_li_request *elr;
unsigned long next_wakeup;
DEFINE_WAIT(wait);
unsigned long next_wakeup, cur;
BUG_ON(NULL == eli);
eli->li_timer.data = (unsigned long)current;
eli->li_timer.function = ext4_lazyinode_timeout;
eli->li_task = current;
wake_up(&eli->li_wait_task);
@ -2811,19 +2801,15 @@ cont_thread:
if (freezing(current))
refrigerator();
if ((time_after_eq(jiffies, next_wakeup)) ||
cur = jiffies;
if ((time_after_eq(cur, next_wakeup)) ||
(MAX_JIFFY_OFFSET == next_wakeup)) {
cond_resched();
continue;
}
eli->li_timer.expires = next_wakeup;
add_timer(&eli->li_timer);
prepare_to_wait(&eli->li_wait_daemon, &wait,
TASK_INTERRUPTIBLE);
if (time_before(jiffies, next_wakeup))
schedule();
finish_wait(&eli->li_wait_daemon, &wait);
schedule_timeout_interruptible(next_wakeup - cur);
if (kthread_should_stop()) {
ext4_clear_request_list();
goto exit_thread;
@ -2847,12 +2833,10 @@ exit_thread:
goto cont_thread;
}
mutex_unlock(&eli->li_list_mtx);
del_timer_sync(&ext4_li_info->li_timer);
eli->li_task = NULL;
wake_up(&eli->li_wait_task);
kfree(ext4_li_info);
ext4_lazyinit_task = NULL;
ext4_li_info = NULL;
mutex_unlock(&ext4_li_mtx);
@ -2880,7 +2864,6 @@ static int ext4_run_lazyinit_thread(void)
if (IS_ERR(ext4_lazyinit_task)) {
int err = PTR_ERR(ext4_lazyinit_task);
ext4_clear_request_list();
del_timer_sync(&ext4_li_info->li_timer);
kfree(ext4_li_info);
ext4_li_info = NULL;
printk(KERN_CRIT "EXT4: error %d creating inode table "
@ -2929,9 +2912,7 @@ static int ext4_li_info_new(void)
INIT_LIST_HEAD(&eli->li_request_list);
mutex_init(&eli->li_list_mtx);
init_waitqueue_head(&eli->li_wait_daemon);
init_waitqueue_head(&eli->li_wait_task);
init_timer(&eli->li_timer);
eli->li_state |= EXT4_LAZYINIT_QUIT;
ext4_li_info = eli;