linux-toradex.git/include/linux/blktrace_api.h, branch v2.6.26-rc5

block: make blktrace use per-cpu buffers for message notes

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

Currently it uses a single static char array, but that risks
being corrupted when multiple users issue message notes at the
same time. Make the buffers dynamically allocated when the trace
is setup and make them per-cpu instead.

The default max message size of 1k is also very large, the
interface is mainly for small text notes. So shrink it to 128 bytes.

Signed-off-by: Jens Axboe

Added in MESSAGE notes for blktraces

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

Allows messages to be inserted into blktrace streams.

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

Fix blktrace compile warning

2008-01-29T20:55:15+00:00

request_queue_t is deprecated

Signed-off-by: Martin K. Petersen 
Signed-off-by: Jens Axboe

blktrace: Add blktrace ioctls to SCSI generic devices

2008-01-28T09:04:46+00:00

Since the SCSI layer uses the request queues from the block layer, blktrace can
also be used to trace the requests to all SCSI devices (like SCSI tape drives),
not only disks. The only missing part is the ioctl interface to start and stop
tracing.

This patch adds the SETUP, START, STOP and TEARDOWN ioctls from blktrace to the
sg device files. With this change, blktrace can be used for SCSI devices like
for disks, e.g.: blktrace -d /dev/sg1 -o - | blkparse -i -

Signed-off-by: Christof Schmitt 
Signed-off-by: Jens Axboe

[BLOCK] Better fix for do_blk_trace_setup() for !CONFIG_BLOCK

2007-10-12T10:50:07+00:00

We don't have the request queue definition, so just make it a
macro instead.

Signed-off-by: Jens Axboe

[BLOCK] Fix failing compile with BLK_DEV_IO_TRACE=n

2007-10-11T19:26:08+00:00

I get a compilation error in sglist-arch branch
with BLK_DEV_IO_TRACE=n:

  CC      block/compat_ioctl.o
/usr0/export/dev/bharrosh/git/pub/linux-2.6-block/block/compat_ioctl.c: In
function ?compat_blk_trace_setup?:
/usr0/export/dev/bharrosh/git/pub/linux-2.6-block/block/compat_ioctl.c:568:
error: expected expression before ?do?
make[2]: *** [block/compat_ioctl.o] Error 1

Signed-off-by: Jens Axboe

compat_ioctl: handle blk_trace ioctls

2007-10-10T07:26:00+00:00

blk_trace_setup is broken on x86_64 compat systems,
this makes the code work correctly on all 64 bit architectures
in compat mode.

Signed-off-by: Arnd Bergmann 
Signed-off-by: Jens Axboe

Fix remap handling by blktrace

2007-08-11T20:34:48+00:00

This patch provides more information concerning REMAP operations on block
IOs. The additional information provides clearer details at the user level,
and supports post-processing analysis in btt.

o  Adds in partition remaps on the same device.
o  Fixed up the remap information in DM to be in the right order
o  Sent up mapped-from and mapped-to device information

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

[BLOCK] Get rid of request_queue_t typedef

2007-07-24T07:28:11+00:00

Some of the code has been gradually transitioned to using the proper
struct request_queue, but there's lots left. So do a full sweet of
the kernel and get rid of this typedef and replace its uses with
the proper type.

Signed-off-by: Jens Axboe

[PATCH] blktrace: add timestamp message

2006-12-01T09:39:12+00:00

This adds a new timestamp message to blktrace, giving the timeofday when
we starting tracing. This helps user space correlate block trace events
with eg an application strace.

This requires a (compatible) update to blkparse. The changed blkparse
is still able to process traces generated by older kernels, and older
versions of blkparse should silently ignore the new records (because
they have a pid of 0).

Signed-off-by: Olaf Kirch 
Signed-off-by: Jens Axboe