linux-toradex.git/block, branch v2.6.17.8

BLOCK: Fix bounce limit address check

2006-07-25T03:35:19+00:00

This fixes some OOMs on 64bit systems with <4GB of RAM when accessing
the cdrom. 

Do a safer check for when to enable DMA. Currently we enable ISA DMA
for cases that do not need it, resulting in OOM conditions when ZONE_DMA
runs out of space.

Signed-off-by: Andi Kleen 
Signed-off-by: Jens Axboe 
Signed-off-by: Chris Wright 
Signed-off-by: Greg Kroah-Hartman

[PATCH] cfq-iosched: fix crash in do_div()

2006-06-14T17:22:16+00:00

We don't clear the seek stat values in cfq_alloc_io_context(), and if
->seek_mean is unlucky enough to be set to -36 by chance, the first
invocation of cfq_update_io_seektime() will oops with a divide by zero
in do_div().

Just memset the entire cic instead of filling invididual values
independently.

Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

[PATCH] elevator switching race

2006-06-08T22:14:23+00:00

There's a race between shutting down one io scheduler and firing up the
next, in which a new io could enter and cause the io scheduler to be
invoked with bad or NULL data.

To fix this, we need to maintain the queue lock for a bit longer.
Unfortunately we cannot do that, since the elevator init requires to be
run without the lock held.  This isn't easily fixable, without also
changing the mempool API.  So split the initialization into two parts,
and alloc-init operation and an attach operation.  Then we can
preallocate the io scheduler and related structures, and run the attach
inside the lock after we detach the old one.

This patch has survived 30 minutes of 1 second io scheduler switching
with a very busy io load.

Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

[PATCH] cfq-iosched: busy_rr fairness fix

2006-06-01T16:53:43+00:00

Now that we select busy_rr for possible service, insert entries at the
back of that list instead of at the front.

Signed-off-by: Jens Axboe

[PATCH] cfq-iosched: fix bug in timer handling for the idle class

2006-06-01T08:13:43+00:00

There's a small window from when the timer is entered and we grab
the queue lock, where cfq_set_active_queue() could be rearming the
timer for us. Seen in the wild on a 12-way ppc box. Fix this by
just using mod_timer(), which will do the right thing for us.

Signed-off-by: Jens Axboe

[PATCH] cfq-iosched: Detect hardware queueing

2006-06-01T08:12:26+00:00

If the hardware is doing real queueing, decide that it's worthless to
idle the hardware. It does reasonable simultaneous io in that case
anyways, and the idling hurts some work loads.

Signed-off-by: Jens Axboe

[PATCH] cfq-iosched: Detect idle process issuing async request

2006-06-01T08:09:56+00:00

If we are anticipating a sync request from this process and we are
waiting for that and see an async request come in, expire that slice
and move on.

Signed-off-by: Jens Axboe

[PATCH] cfq-iosched: check busy queues before deciding we are idle

2006-06-01T08:07:26+00:00

For just one busy queue (like async write out), we often overlooked
that we could queue more io and decided we were idle instead. This causes
us quite a bit of performance loss.

Signed-off-by: Jens Axboe

[PATCH] cfq-iosched: fixup locking and ->queue_list list management

2006-05-31T03:31:05+00:00

- Drop cic from the list when seen as dead.
- Fixup the locking, just use a simple spinlock.

Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

[PATCH] blk: fix gendisk->in_flight accounting during barrier sequence

2006-05-23T17:39:43+00:00

While executing barrrier sequence, the bar_rq which carries actual
write was accounted as normal IO on completion, while it wasn't on
queueing.  This caused gendisk->in_flight to be decremented by 1 after
each barrier thus messed up statistics.

This patch makes bar_rq not accounted as normal IO.  As the containing
barrier request as a whole is accounted, part of it shouldn't be.

Signed-off-by: Tejun Heo 
Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds