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author | Jens Axboe <axboe@fb.com> | 2015-07-28 13:14:32 -0600 |
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committer | Jens Axboe <axboe@fb.com> | 2015-07-29 08:55:25 -0600 |
commit | 2c68f6dc6e621153a708bef6c569805762da2020 (patch) | |
tree | f5232fa96a9049981479daf8e2d5818f70878a28 /fs/direct-io.c | |
parent | b7c44ed9d2fc6b461378c65eaf144ccc80a47772 (diff) | |
download | op-kernel-dev-2c68f6dc6e621153a708bef6c569805762da2020.zip op-kernel-dev-2c68f6dc6e621153a708bef6c569805762da2020.tar.gz |
block: shrink struct bio down to 2 cache lines again
Commit bcf2843b3f8f added ->bi_error to cleanup the error passing
for struct bio, but that ended up adding 4 bytes and a 4 byte hole
to the size of struct bio. For a clean config, that bumped it from
128 bytes, to 136 bytes, on x86-64.
The ->bi_flags member is currently an unsigned long, but it fits
easily within an int. Change it to an unsigned int, adjust the
the pool offset code, and move ->bi_error into the new hole. Then
we end up with a 128 byte bio again.
Change the bio flag set/clear to use cmpxchg to ensure we don't
lose any flags when manipulating them.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/direct-io.c')
0 files changed, 0 insertions, 0 deletions