Andriy Gapon 3d775e193e 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
2017-03-23 08:59:17 +00:00
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