diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2011-07-25 17:11:57 -0700 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2011-08-01 13:55:00 -0700 |
| commit | 6b1ffd2fa340aca8687ec0d1795c0be19f72a29c (patch) | |
| tree | acca5f62f39083a6e6ac11f12b735988263a1088 /mm | |
| parent | 444442d989e4b1fe12527ffa0d94d582177194da (diff) | |
mm/backing-dev.c: reset bdi min_ratio in bdi_unregister()
[ upstream commit ccb6108f5b0b541d3eb332c3a73e645c0f84278e ]
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/backing-dev.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index c0f715719829..3f2b8d037c98 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -646,6 +646,7 @@ static void bdi_prune_sb(struct backing_dev_info *bdi) void bdi_unregister(struct backing_dev_info *bdi) { if (bdi->dev) { + bdi_set_min_ratio(bdi, 0); bdi_prune_sb(bdi); if (!bdi_cap_flush_forker(bdi)) |