Chunwei Chen 692e55b8fe Reinstate zvol_taskq to fix aio on zvol ... Commit 37f9dac removed the zvol_taskq for processing zvol requests. This was removed as part of switching to make_request_fn and was motivated by a concern at the time over dispatch latency. However, this also made all bio request synchronous, and caused serious performance issues as the bio submitter would wait for every bio it submitted, effectively making the IO depth 1. This patch reinstate zvol_taskq, and to make sure overlapped I/Os are ordered properly, we take range lock in zvol_request, and pass it along with bio to the I/O functions zvol_{write,discard,read}. In order to facilitate benchmarks a zvol_request_sync module option was added to switch between sync and async request handling. For the moment, the default behavior is synchronous but this is likely to change pending additional testing. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Closes #5824		2017-04-26 13:54:40 -07:00
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linux	Reinstate zvol_taskq to fix aio on zvol	2017-04-26 13:54:40 -07:00
sys	OpenZFS 5120 - zfs should allow large block/gzip/raidz boot pool (loader project)	2017-04-13 09:40:00 -07:00
Makefile.am	Kernel header installation should respect --prefix	2014-10-28 09:37:06 -07:00
libnvpair.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil_common.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libzfs.h	Prebaked scripts for zpool status/iostat -c	2017-04-21 09:27:04 -07:00
libzfs_core.h	OpenZFS 6052 - decouple lzc_create() from the implementation details	2017-01-23 09:49:57 -08:00
libzfs_impl.h	OpenZFS 7541 - zpool import/tryimport ioctl returns ENOMEM	2017-01-30 13:20:54 -08:00
zfeature_common.h	OpenZFS 2932 - support crash dumps to raidz, etc. pools	2017-04-10 10:24:17 -07:00
zfs_comutil.h	Illumos #2882, #2883, #2900	2013-09-04 15:49:00 -07:00
zfs_deleg.h	Add support for user/group dnode accounting & quota	2016-10-07 09:45:13 -07:00
zfs_fletcher.h	DLPX-44812 integrate EP-220 large memory scalability	2016-11-29 14:34:27 -08:00
zfs_namecheck.h	OpenZFS 7386 - zfs get does not work properly with bookmarks	2017-01-26 14:42:15 -08:00
zfs_prop.h	Check the dataset type more rigorously when fetching properties.	2014-05-06 10:41:46 -07:00
zpios-ctl.h	Fix spelling	2017-01-03 11:31:18 -06:00
zpios-internal.h	Fix spelling	2017-01-03 11:31:18 -06:00