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Reinstate zvol_taskq to fix aio on zvol #5824

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Reinstate zvol_taskq to fix aio on zvol #5824

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05431b4
Reinstate zvol_taskq to fix aio on zvol
Feb 23, 2017
a419258
Add zvol_request_sync module option
behlendorf Apr 26, 2017
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11 changes: 9 additions & 2 deletions include/linux/blkdev_compat.h
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Original file line number Diff line number Diff line change
Expand Up @@ -498,8 +498,15 @@ blk_queue_discard_granularity(struct request_queue *q, unsigned int dg)
#define VDEV_HOLDER ((void *)0x2401de7)

#ifndef HAVE_GENERIC_IO_ACCT
#define generic_start_io_acct(rw, slen, part) ((void)0)
#define generic_end_io_acct(rw, part, start_jiffies) ((void)0)
static inline void
generic_start_io_acct(int rw, unsigned long sectors, struct hd_struct *part)
{
}

static inline void
generic_end_io_acct(int rw, struct hd_struct *part, unsigned long start_time)
{
}
#endif

#endif /* _ZFS_BLKDEV_H */
25 changes: 25 additions & 0 deletions man/man5/zfs-module-parameters.5
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Expand Up @@ -2004,6 +2004,31 @@ table.
Default value: \fB131,072\fR.
.RE

.sp
.ne 2
.na
\fBzvol_request_sync\fR (uint)
.ad
.RS 12n
When processing I/O requests for a zvol submit them synchronously. This
effectively limits the queue depth to 1 for each I/O submitter. When set
to 0 requests are handled asynchronously by a thread pool. The number of
requests which can be handled concurrently is controller by \fBzvol_threads\fR.
.sp
Default value: \fB1\fR.
.RE

.sp
.ne 2
.na
\fBzvol_threads\fR (uint)
.ad
.RS 12n
Max number of threads which can handle zvol I/O requests concurrently.
.sp
Default value: \fB32\fR.
.RE

.sp
.ne 2
.na
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