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mm/backing-dev.c: reset bdi min_ratio in bdi_unregister()

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Vito said:

: The system has many usb disks coming and going day to day, with their
: respective bdi's having min_ratio set to 1 when inserted.  It works for
: some time until eventually min_ratio can no longer be set, even when the
: active set of bdi's seen in /sys/class/bdi/*/min_ratio doesn't add up to
: anywhere near 100.
:
: This then leads to an unrelated starvation problem caused by write-heavy
: fuse mounts being used atop the usb disks, a problem the min_ratio setting
: at the underlying devices bdi effectively prevents.

Fix this leakage by resetting the bdi min_ratio when unregistering the
BDI.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Reported-by: Vito Caputo <lkml@pengaru.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra 2011-07-25 17:11:57 -07:00 committed by Linus Torvalds
parent 2b934c6236
commit ccb6108f5b
1 changed files with 1 additions and 0 deletions
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mm/backing-dev.c
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@ -606,6 +606,7 @@ static void bdi_prune_sb(struct backing_dev_info *bdi)
void bdi_unregister(struct backing_dev_info *bdi) void bdi_unregister(struct backing_dev_info *bdi)
{ {
if (bdi->dev) { if (bdi->dev) {
bdi_set_min_ratio(bdi, 0);
trace_writeback_bdi_unregister(bdi); trace_writeback_bdi_unregister(bdi);
bdi_prune_sb(bdi); bdi_prune_sb(bdi);
del_timer_sync(&bdi->wb.wakeup_timer); del_timer_sync(&bdi->wb.wakeup_timer);