diff options
| author | Seymour, Shane M <[email protected]> | 2015-05-06 01:37:20 +0000 |
|---|---|---|
| committer | James Bottomley <[email protected]> | 2015-06-02 08:03:25 -0700 |
| commit | 05545c92db9637318a98d3d59d400beb819decc7 (patch) | |
| tree | 56c911568dd7dd6507aac24f7c8c90b657f7bda0 /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | ba929992522b6d1f866b7021bc50da66f8fdd743 (diff) | |
st: implement tape statistics
This patch implements tape statistics in the st module via
sysfs. Current no statistics are available for tape I/O and there
is no easy way to reuse the block layer statistics for tape
as tape is a character device and does not have perform I/O in
sector sized chunks (the size of the data written to tape
can change). For tapes we also need extra stats related to
things like tape movement (via other I/O).
There have been multiple end users requesting statistics
including AT&T (and some HP customers who have not given
permission to be named). It is impossible for them
to investigate any issues related to tape performance
in a non-invasive way.
[jejb: eliminate PRId64]
Signed-off-by: Shane Seymour <[email protected]>
Tested-by: Shane Seymour <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions