|| ||Namhyung Kim <email@example.com> |
|| ||Jens Axboe <firstname.lastname@example.org> |
|| ||[PATCH 0/6] blktrace: bio-based device tracing improvement |
|| ||Mon, 29 Aug 2011 12:47:34 +0900|
|| ||email@example.com, firstname.lastname@example.org|
|| ||Article, Thread
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.
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(-)
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