tree 614b8e857a70ce479bcbbf24af66a56b7723efc8
parent bb799ca0202a360fa74d5f17039b9100caebdde7
author Jens Axboe <jens.axboe@oracle.com> 1230032574 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1230535790 +0100

bio: add support for inlining a number of bio_vecs inside the bio

When we go and allocate a bio for IO, we actually do two allocations.
One for the bio itself, and one for the bi_io_vec that holds the
actual pages we are interested in.

This feature inlines a definable amount of io vecs inside the bio
itself, so we eliminate the bio_vec array allocation for IO's up
to a certain size. It defaults to 4 vecs, which is typically 16k
of IO.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>