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| author | Christoph Hellwig <hch@lst.de> | 2022-08-06 11:03:29 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-09-26 13:27:59 +0300 |
| commit | 03793cbbc80fe616498f8141f853575b2d140222 (patch) | |
| tree | 2c8c3eee37c53fa161837bc253067d0975a9435e /tools/perf/scripts/python/check-perf-trace.py | |
| parent | 28793b194e6a0e50d4abc6fec7472799aa734d1f (diff) | |
| download | linux-03793cbbc80fe616498f8141f853575b2d140222.tar.xz | |
btrfs: add fast path for single device io in __btrfs_map_block
There is no need for most of the btrfs_io_context when doing I/O to a
single device. To support such I/O without the extra btrfs_io_context
allocation, turn the mirror_num argument into a pointer so that it can
be used to output the selected mirror number, and add an optional
argument that points to a btrfs_io_stripe structure, which will be
filled with a single extent if provided by the caller.
In that case the btrfs_io_context allocation can be skipped as all
information for the single device I/O is provided in the mirror_num
argument and the on-stack btrfs_io_stripe. A caller that makes use of
this new argument will be added in the next commit.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'tools/perf/scripts/python/check-perf-trace.py')
0 files changed, 0 insertions, 0 deletions