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writeback: move last_active to bdi 

Currently bdi threads use local variable 'last_active' which stores last time
when the bdi thread did some useful work. Move this local variable to 'struct
bdi_writeback'. This is just a preparation for the further patches which will
make the forker thread decide when bdi threads should be killed.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Artem Bityutskiy 2010-07-25 14:29:18 +03:00 committed by Jens Axboe
parent 78c40cb658
commit ecd584030d
2 changed files with 10 additions and 9 deletions
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6
fs/fs-writeback.c
View File

@ -800,12 +800,12 @@ int bdi_writeback_thread(void *data)
{
struct bdi_writeback *wb = data;
struct backing_dev_info *bdi = wb->bdi;
unsigned long last_active = jiffies;
unsigned long wait_jiffies = -1UL;
long pages_written;
current->flags |= PF_FLUSHER | PF_SWAPWRITE;
set_freezable();
wb->last_active = jiffies;
/*
* Our parent may run at a different priority, just set us to normal
@ -827,7 +827,7 @@ int bdi_writeback_thread(void *data)
trace_writeback_pages_written(pages_written);
if (pages_written)
last_active = jiffies;
wb->last_active = jiffies;
else if (wait_jiffies != -1UL) {
unsigned long max_idle;
@ -837,7 +837,7 @@ int bdi_writeback_thread(void *data)
* recreated automatically.
*/
max_idle = max(5UL * 60 * HZ, wait_jiffies);
if (time_after(jiffies, max_idle + last_active))
if (time_after(jiffies, max_idle + wb->last_active))
break;
}

13
include/linux/backing-dev.h
View File

@ -45,15 +45,16 @@ enum bdi_stat_item {
#define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))
struct bdi_writeback {
struct backing_dev_info *bdi; /* our parent bdi */
struct backing_dev_info *bdi; /* our parent bdi */
unsigned int nr;
unsigned long last_old_flush; /* last old data flush */
unsigned long last_old_flush; /* last old data flush */
unsigned long last_active; /* last time bdi thread was active */
struct task_struct *task; /* writeback thread */
struct list_head b_dirty; /* dirty inodes */
struct list_head b_io; /* parked for writeback */
struct list_head b_more_io; /* parked for more writeback */
struct task_struct *task; /* writeback thread */
struct list_head b_dirty; /* dirty inodes */
struct list_head b_io; /* parked for writeback */
struct list_head b_more_io; /* parked for more writeback */
};
struct backing_dev_info {