K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2017-03-23T08:59:17.010986Z
K 7
svn:log
V 383
zfs: add zio_buf_alloc_nowait and use it in vdev_queue_aggregate

This way we can avoid blocking the whole queue in the low memory
situations.  It's better to sacrifice some I/O performance by not doing
the aggregation than to add an indefinite wait for more memory.

Reviewed by:	smh
MFC after:	2 weeks
Sponsored by:	Panzura
Differential Revision: https://reviews.freebsd.org/D9999

END