linux-stable.git/drivers/md/bcache/writeback.c, branch linux-3.13.y

bcache: New writeback PD controller

2013-12-16T22:22:59+00:00

The old writeback PD controller could get into states where it had throttled all
the way down and take way too long to recover - it was too complicated to really
understand what it was doing.

This rewrites a good chunk of it to hopefully be simpler and make more sense,
and it also pays more attention to units which should make the behaviour a bit
easier to understand.

Signed-off-by: Kent Overstreet

bcache: Use uninterruptible sleep in writeback

2013-12-16T22:04:57+00:00

We're just waiting on kthread_should_stop(), nothing else, so
interruptible sleep was wrong here.

Signed-off-by: Kent Overstreet

bcache: kthread don't set writeback task to INTERUPTIBLE

2013-12-16T22:04:57+00:00

at the beginning (schedule_timout_interuptible) and others
do his on their own

This prevents wrong load average calculation (load of 1 per thread)

Signed-off-by: Kent Overstreet

bcache: Fix sysfs splat on shutdown with flash only devs

2013-11-11T05:56:41+00:00

Whoops.

Signed-off-by: Kent Overstreet

bcache: Better full stripe scanning

2013-11-11T05:56:41+00:00

The old scanning-by-stripe code burned too much CPU, this should be
better.

Signed-off-by: Kent Overstreet

bcache: Convert bch_btree_insert() to bch_btree_map_leaf_nodes()

2013-11-11T05:56:31+00:00

Last of the btree_map() conversions. Main visible effect is
bch_btree_insert() is no longer taking a struct btree_op as an argument
anymore - there's no fancy state machine stuff going on, it's just a
normal function.

Signed-off-by: Kent Overstreet

bcache: Don't use op->insert_collision

2013-11-11T05:56:30+00:00

When we convert bch_btree_insert() to bch_btree_map_leaf_nodes(), we
won't be passing struct btree_op to bch_btree_insert() anymore - so we
need a different way of returning whether there was a collision (really,
a replace collision).

Signed-off-by: Kent Overstreet

bcache: Kill op->replace

2013-11-11T05:56:29+00:00

This is prep work for converting bch_btree_insert to
bch_btree_map_leaf_nodes() - we have to convert all its arguments to
actual arguments. Bunch of churn, but should be straightforward.

Signed-off-by: Kent Overstreet

bcache: Kill op->cl

2013-11-11T05:56:09+00:00

This isn't used for waiting asynchronously anymore - so this is a fairly
trivial refactoring.

Signed-off-by: Kent Overstreet

bcache: Prune struct btree_op

2013-11-11T05:56:08+00:00

Eventual goal is for struct btree_op to contain only what is necessary
for traversing the btree.

Signed-off-by: Kent Overstreet