[PATCH 0/6] blktrace: bio-based device tracing improvement

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello,

The blktrace is used to report block device activities to user space
using kernel tracepoint but it was focused to block I/O request struct.
Thus bio-based devices (i.e. loop, ram, md, ...) which don't make use
of the request structure could not be supported well - the tool only
can detect a limited number of events such as queuing, cloning and
remapping but it cannot know when the I/O activity is completed.

bio_endio(), the I/O completion callback, can be used to fix this
problem by adding appropriate tracepoint in it. However it was called
from other paths too (normal request-based block devices and some of
nested block I/O handling routines) so that we should split such cases
to remove duplicated reports. In this series, __bio_endio() (and its
helper __bio_io_error) was introduced and converted for that purpose.

Note that (bio-based) dm already supported completion report by adding
the tracepoint into the path manually. With this patches, it will be
converted to use generic mechanism.

This patch set is based on v3.1-rc3.
Patch 1 is to correct remapping information and independent to others.
Patch 2 is the core of this series and Patch 3-5 are mechanical converts.
Patch 6 removes manual use of the tracepoint in dm.

Any feedbacks are welcome.

Thanks.


Namhyung Kim (6):
  block: move trace_block_bio_remap() before blk_partition_remap
  block: introduce __bio_endio()
  bounce: convert to __bio_endio() for bounced bio's
  bio-integrity: convert to __bio_endio()
  Btrfs: convert to __bio_endio()
  dm: get rid of block_bio_complete tracepoint

 block/blk-core.c       |   11 +++++------
 drivers/md/dm.c        |    1 -
 fs/bio-integrity.c     |    4 ++--
 fs/bio.c               |   19 +++++++++++++++++++
 fs/btrfs/compression.c |    4 ++--
 fs/btrfs/disk-io.c     |    2 +-
 fs/btrfs/inode.c       |    8 ++++----
 fs/btrfs/volumes.c     |    4 ++--
 include/linux/bio.h    |    2 ++
 mm/bounce.c            |    2 +-
 10 files changed, 38 insertions(+), 19 deletions(-)

-- 
1.7.6

--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux