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| author | Ming Lei <ming.lei@redhat.com> | 2021-10-12 13:12:23 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 06:17:36 -0600 |
| commit | 19416123ab3e1348b3532347af221d8f60838431 (patch) | |
| tree | 397577056c7e19755c43e93d1475c16de469e09d | |
| parent | 1a7e76e4f130332b5d3b0c72c4f664e59deb1239 (diff) | |
| download | linux-19416123ab3e1348b3532347af221d8f60838431.tar.bz2 | |
block: define 'struct bvec_iter' as packed
'struct bvec_iter' is embedded into 'struct bio', define it as packed
so that we can get one extra 4bytes for other uses without expanding
bio.
'struct bvec_iter' is often allocated on stack, so making it packed
doesn't affect performance. Also I have run io_uring on both
nvme/null_blk, and not observe performance effect in this way.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Mark Wunderlich <mark.wunderlich@intel.com>
Link: https://lore.kernel.org/r/20211012111226.760968-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/bvec.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/bvec.h b/include/linux/bvec.h index 0e9bdd42dafb..35c25dff651a 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -44,7 +44,7 @@ struct bvec_iter { unsigned int bi_bvec_done; /* number of bytes completed in current bvec */ -}; +} __packed; struct bvec_iter_all { struct bio_vec bv; |