This is a note to let you know that I've just added the patch titled
mm/backing-dev.c: reset bdi min_ratio in bdi_unregister()
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-backing-dev.c-reset-bdi-min_ratio-in-bdi_unregister.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From ccb6108f5b0b541d3eb332c3a73e645c0f84278e Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <[email protected]>
Date: Mon, 25 Jul 2011 17:11:57 -0700
Subject: mm/backing-dev.c: reset bdi min_ratio in bdi_unregister()
From: Peter Zijlstra <[email protected]>
commit ccb6108f5b0b541d3eb332c3a73e645c0f84278e upstream.
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 <[email protected]>
Reported-by: Vito Caputo <[email protected]>
Cc: Wu Fengguang <[email protected]>
Cc: Miklos Szeredi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/backing-dev.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -606,6 +606,7 @@ static void bdi_prune_sb(struct backing_
void bdi_unregister(struct backing_dev_info *bdi)
{
if (bdi->dev) {
+ bdi_set_min_ratio(bdi, 0);
trace_writeback_bdi_unregister(bdi);
bdi_prune_sb(bdi);
del_timer_sync(&bdi->wb.wakeup_timer);
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/mm-backing-dev.c-reset-bdi-min_ratio-in-bdi_unregister.patch
queue-3.0/perf-tools-fix-endian-conversion-reading-event-attr-from.patch
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