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writeback: fixups for !dirty_writeback_centisecs

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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 <[email protected]>
This commit is contained in:
Jens Axboe 2010-05-21 20:00:35 +02:00
commit 6423104b6a
3 changed files with 12 additions and 5 deletions
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1
mm/page-writeback.c
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@ -690,6 +690,7 @@ 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;
}