linux-toradex.git/include/trace/events/block.h, branch v3.2.73

blktrace: fix accounting of partially completed requests

2014-04-30T15:23:20+00:00

commit af5040da01ef980670b3741b3e10733ee3e33566 upstream.

trace_block_rq_complete does not take into account that request can
be partially completed, so we can get the following incorrect output
of blkparser:

  C   R 232 + 240 [0]
  C   R 240 + 232 [0]
  C   R 248 + 224 [0]
  C   R 256 + 216 [0]

but should be:

  C   R 232 + 8 [0]
  C   R 240 + 8 [0]
  C   R 248 + 8 [0]
  C   R 256 + 8 [0]

Also, the whole output summary statistics of completed requests and
final throughput will be incorrect.

This patch takes into account real completion size of the request and
fixes wrong completion accounting.

Signed-off-by: Roman Pen 
CC: Steven Rostedt 
CC: Frederic Weisbecker 
CC: Ingo Molnar 
CC: linux-kernel@vger.kernel.org
Signed-off-by: Jens Axboe 
[bwh: Backported to 3.2: drop change in blk-mq.c]
Signed-off-by: Ben Hutchings

blktrace: add FLUSH/FUA support

2011-08-11T08:36:05+00:00

Add FLUSH/FUA support to blktrace. As FLUSH precedes WRITE and/or
FUA follows WRITE, use the same 'F' flag for both cases and
distinguish them by their (relative) position. The end results
look like (other flags might be shown also):

 - WRITE:            W
 - WRITE_FLUSH:      FW
 - WRITE_FUA:        WF
 - WRITE_FLUSH_FUA:  FWF

Note that we reuse TC_BARRIER due to lack of bit space of act_mask
so that the older versions of blktrace tools will report flush
requests as barriers from now on.

Cc: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Signed-off-by: Namhyung Kim 
Reviewed-by: Jeff Moyer 
Signed-off-by: Jens Axboe

block: make unplug timer trace event correspond to the schedule() unplug

2011-04-16T11:51:05+00:00

It's a pretty close match to what we had before - the timer triggering
would mean that nobody unplugged the plug in due time, in the new
scheme this matches very closely what the schedule() unplug now is.
It's essentially the difference between an explicit unplug (IO unplug)
or an implicit unplug (timer unplug, we scheduled with pending IO
queued).

Signed-off-by: Jens Axboe

block: fixup block IO unplug trace call

2011-04-12T08:12:19+00:00

It was removed with the on-stack plugging, readd it and track the
depth of requests added when flushing the plug.

Signed-off-by: Jens Axboe

block: remove block_unplug_timer() trace point

2011-04-12T08:06:33+00:00

We no longer have an unplug timer running, so no point in keeping
the trace point.

Signed-off-by: Jens Axboe

blktrace: Remove blk_fill_rwbs_rq.

2011-03-03T15:53:20+00:00

If we enable trace events to trace block actions, We use
blk_fill_rwbs_rq to analyze the corresponding actions
in request's cmd_flags, but we only choose the minor 2 bits
from it, so most of other flags(e.g, REQ_SYNC) are missing.
For example, with a sync write we get:
write_test-2409  [001]   160.013869: block_rq_insert: 3,64 W 0 () 258135 + =
8 [write_test]

Since now we have integrated the flags of both bio and request,
it is safe to pass rq->cmd_flags directly to blk_fill_rwbs and
blk_fill_rwbs_rq isn't needed any more.

With this patch, after a sync write we get:
write_test-2417  [000]   226.603878: block_rq_insert: 3,64 WS 0 () 258135 +=
 8 [write_test]

Signed-off-by: Tao Ma 
Acked-by: Jeff Moyer 
Signed-off-by: Jens Axboe

block: trace event block fix unassigned field

2011-01-07T07:43:55+00:00

The "error" field in block_bio_complete is not assigned, leaving the memory area
uninitialized (keeping garbage data). Pass an additional tracepoint argument to
this event to initialize this field.

Signed-off-by: Jeff Moyer 
Signed-off-by: Mathieu Desnoyers 
CC: Steven Rostedt 
CC: Frederic Weisbecker 
CC: Ingo Molnar 
CC: Thomas Gleixner 
CC: Li Zefan 
CC: Alan.Brunelle@hp.com
Signed-off-by: Jens Axboe

block: Rename "block_remap" tracepoint to "block_bio_remap" to clarify the event.

2010-11-16T11:53:39+00:00

Signed-off-by: Kiyoshi Ueda 
Signed-off-by: Jun'ichi Nomura 
Signed-off-by: Mike Snitzer 
Signed-off-by: Jens Axboe

block: remove wrappers for request type/flags

2010-08-07T16:17:56+00:00

Remove all the trivial wrappers for the cmd_type and cmd_flags fields in
struct requests.  This allows much easier grepping for different request
types instead of unwinding through macros.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

Add DocBook documentation for the block tracepoints.

2010-03-09T08:26:04+00:00

This patch adds a simple description of the various block tracepoints
available in the kernel.

Signed-off-by: William Cohen 
Acked-by: Randy Dunlap 
Signed-off-by: Jens Axboe