linux.git/block/elevator.c, branch v2.6.26

Added in elevator switch message to blktrace stream

2008-05-28T12:49:27+00:00

Signed-off-by: Alan D. Brunelle 
Signed-off-by: Jens Axboe

block: remove remaining FUNCTION occurrences

2008-05-01T15:04:02+00:00

__FUNCTION__ is gcc specific, use __func__

Signed-off-by: Harvey Harrison 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: Skip I/O merges when disabled

2008-04-29T12:48:55+00:00

The block I/O + elevator + I/O scheduler code spend a lot of time trying
to merge I/Os -- rightfully so under "normal" circumstances. However,
if one were to know that the incoming I/O stream was /very/ random in
nature, the cycles are wasted.

This patch adds a per-request_queue tunable that (when set) disables
merge attempts (beyond the simple one-hit cache check), thus freeing up
a non-trivial amount of CPU cycles.

Signed-off-by: Alan D. Brunelle 
Signed-off-by: Jens Axboe

block/elevator.c:elv_rq_merge_ok() mustn't be inline

2008-04-29T12:48:54+00:00

This patch fixes the following build error with UML and gcc 4.3:

<--  snip  -->

...
  CC      block/elevator.o
/home/bunk/linux/kernel-2.6/git/linux-2.6/block/elevator.c: In function ‘elv_merge’:
/home/bunk/linux/kernel-2.6/git/linux-2.6/block/elevator.c:73: sorry, unimplemented: inlining failed in call to ‘elv_rq_merge_ok’: function body not available
/home/bunk/linux/kernel-2.6/git/linux-2.6/block/elevator.c:103: sorry, unimplemented: called from here
/home/bunk/linux/kernel-2.6/git/linux-2.6/block/elevator.c:73: sorry, unimplemented: inlining failed in call to ‘elv_rq_merge_ok’: function body not available
/home/bunk/linux/kernel-2.6/git/linux-2.6/block/elevator.c:495: sorry, unimplemented: called from here
make[2]: *** [block/elevator.o] Error 1
make[1]: *** [block] Error 2

<--  snip  -->

Signed-off-by: Adrian Bunk 
Signed-off-by: Jens Axboe

block: make queue flags non-atomic

2008-04-29T12:48:33+00:00

We can save some atomic ops in the IO path, if we clearly define
the rules of how to modify the queue flags.

Signed-off-by: Jens Axboe

elevator: make elevator_get() attempt to load the appropriate module

2008-02-19T09:20:37+00:00

Currently we fail if someone requests a valid io scheduler, but it's
modular and not currently loaded. That can happen from a driver init
asking for a different scheduler, or online switching through sysfs
as requested by a user.

This patch makes elevator_get() request_module() to attempt to load
the appropriate module, instead of requiring that done manually.

Signed-off-by: Jens Axboe

block: make elevator lib checkpatch compliant

2008-02-01T08:26:33+00:00

Signed-off-by: Jens Axboe

block: implement drain buffers

2008-01-28T09:54:11+00:00

These DMA drain buffer implementations in drivers are pretty horrible
to do in terms of manipulating the scatterlist.  Plus they're being
done at least in drivers/ide and drivers/ata, so we now have code
duplication.

The one use case for this, as I understand it is AHCI controllers doing
PIO mode to mmc devices but translating this to DMA at the controller
level.

So, what about adding a callback to the block layer that permits the
adding of the drain buffer for the problem devices.  The idea is that
you'd do this in slave_configure after you find one of these devices.

The beauty of doing it in the block layer is that it quietly adds the
drain buffer to the end of the sg list, so it automatically gets mapped
(and unmapped) without anything unusual having to be done to the
scatterlist in driver/scsi or drivers/ata and without any alteration to
the transfer length.

Signed-off-by: James Bottomley 
Signed-off-by: Jens Axboe

Kobject: rename kobject_init_ng() to kobject_init()

2008-01-25T04:40:38+00:00

Now that the old kobject_init() function is gone, rename
kobject_init_ng() to kobject_init() to clean up the namespace.

Cc: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

Kobject: rename kobject_add_ng() to kobject_add()