linux-toradex.git/include/linux/iocontext.h, branch v2.6.38.5

block: remove unused copy_io_context()

2010-11-11T12:40:11+00:00

Reported-by: Oleg Nesterov 
Signed-off-by: Jens Axboe

kernel: __rcu annotations

2010-08-20T00:18:03+00:00

This adds annotations for RCU operations in core kernel components

Signed-off-by: Arnd Bergmann 
Signed-off-by: Paul E. McKenney 
Cc: Al Viro 
Cc: Jens Axboe 
Cc: Andrew Morton 
Reviewed-by: Josh Triplett

cfq-iosched: remove dead_key from cfq_io_context

2010-05-24T07:06:59+00:00

Remove ->dead_key field from cfq_io_context to shrink its size to 128 bytes.
(64 bytes for 32-bit hosts)

Use lower bit in ->key as dead-mark, instead of moving key to separate field.
After this for dead cfq_io_context we got cic->key != cfqd automatically.
Thus, io_context's last-hit cache should work without changing.

Now to check ->key for non-dead state compare it with cfqd,
instead of checking ->key for non-null value as it was before.

Plus remove obsolete race protection in cfq_cic_lookup.
This race gone after v2.6.24-1728-g4ac845a

Signed-off-by: Konstantin Khlebnikov 
Signed-off-by: Jens Axboe

cgroups: blkio subsystem as module

2010-03-12T23:52:36+00:00

Modify the Block I/O cgroup subsystem to be able to be built as a module.
As the CFQ disk scheduler optionally depends on blk-cgroup, config options
in block/Kconfig, block/Kconfig.iosched, and block/blk-cgroup.h are
enhanced to support the new module dependency.

Signed-off-by: Ben Blum 
Cc: Li Zefan 
Cc: Paul Menage 
Cc: "David S. Miller" 
Cc: KAMEZAWA Hiroyuki 
Cc: Lai Jiangshan 
Cc: Vivek Goyal 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: remove padding from io_context on 64bit builds

2010-02-26T13:00:43+00:00

On 64 bit builds when CONFIG_BLK_CGROUP=n (the default) this removes 8
bytes of padding from structure io_context and drops its size from 72 to
64 bytes, so needing one fewer cachelines and allowing more objects per
slab in it's kmem_cache.

Signed-off-by: Richard Kennedy 

----
patch against 2.6.33
compiled & test on x86_64 AMDX2
regards
Richard
Signed-off-by: Jens Axboe

block: removed unused as_io_context

2010-01-11T13:29:20+00:00

It isn't used anymore, since AS was deleted.

Signed-off-by: Jens Axboe

block: Fix io_context leak after failure of clone with CLONE_IO

2009-12-04T15:36:18+00:00

With CLONE_IO, parent's io_context->nr_tasks is incremented, but never
decremented whenever copy_process() fails afterwards, which prevents
exit_io_context() from calling IO schedulers exit functions.

Give a task_struct to exit_io_context(), and call exit_io_context() instead of
put_io_context() in copy_process() cleanup path.

Signed-off-by: Louis Rilling 
Signed-off-by: Jens Axboe

blkio: Introduce blkio controller cgroup interface

2009-12-03T18:28:51+00:00

o This is basic implementation of blkio controller cgroup interface. This is
  the common interface visible to user space and should be used by different
  IO control policies as we implement those.

Signed-off-by: Vivek Goyal 
Signed-off-by: Jens Axboe

cfq: calculate the seek_mean per cfq_queue not per cfq_io_context

2009-10-26T13:34:46+00:00

async cfq_queue's are already shared between processes within the same
priority, and forthcoming patches will change the mapping of cic to sync
cfq_queue from 1:1 to 1:N.  So, calculate the seekiness of a process
based on the cfq_queue instead of the cfq_io_context.

Signed-off-by: Jeff Moyer 
Signed-off-by: Jens Axboe

io context: fix ref counting

2009-07-31T06:55:48+00:00

Commit d9c7d394a8ebacb60097b192939ae9f15235225e
("block: prevent possible io_context->refcount overflow") mistakenly
changed atomic_inc(&ioc->nr_tasks) to atomic_long_inc(&ioc->refcount).

Signed-off-by: Li Zefan 
Acked-by: Nikanth Karthikesan 
Signed-off-by: Jens Axboe