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OpenZFS 8558, 8602 - lwp_create() returns EAGAIN

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8558 lwp_create() returns EAGAIN on system with more than 80K ZFS filesystems

On a system with more than 80K ZFS filesystems, we've seen cases
where lwp_create() will start to fail by returning EAGAIN. The
problem being, for each of those 80K ZFS filesystems, a taskq will
be created for each dataset as part of the ZIL for each dataset.

Porting Notes:
- The new nomem taskq kstat was dropped.
- Added module options and documentation for new tunings
  zfs_zil_clean_taskq_nthr_pct, zfs_zil_clean_taskq_minalloc,
  zfs_zil_clean_taskq_maxalloc, and zfs_sync_taskq_batch_pct.

Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Sebastien Roy <sebastien.roy@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Authored by: Prakash Surya <prakash.surya@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Chris Dunlop <chris@onthe.net.au>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/8558
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/216d772

8602 remove unused "dp_early_sync_tasks" field from "dsl_pool" structure

Reviewed by: Serapheim Dimitropoulos <serapheim@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Authored by: Prakash Surya <prakash.surya@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Chris Dunlop <chris@onthe.net.au>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/8602
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/2bcb545
Closes #6779
This commit is contained in:
Brian Behlendorf
2017-10-26 12:57:53 -07:00
committed by GitHub
parent d3f2cd7e3b
commit a032ac4b38
5 changed files with 105 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
man/man5/zfs-module-parameters.5
+48
View File
@@ -1745,6 +1745,18 @@ Rewrite new block pointers starting in this pass
Default value: \fB2\fR.
.RE
.sp
.ne 2
.na
\fBzfs_sync_taskq_batch_pct\fR (int)
.ad
.RS 12n
This controls the number of threads used by the dp_sync_taskq. The default
value of 75% will create a maximum of one thread per cpu.
.sp
Default value: \fB75\fR.
.RE
.sp
.ne 2
.na
@@ -1999,6 +2011,42 @@ in the queue can be viewed with the \fBzpool events\fR command.
Default value: \fB0\fR.
.RE
.sp
.ne 2
.na
\fBzfs_zil_clean_taskq_maxalloc\fR (int)
.ad
.RS 12n
The maximum number of taskq entries that are allowed to be cached. When this
limit is exceeded itx's will be cleaned synchronously.
.sp
Default value: \fB1048576\fR.
.RE
.sp
.ne 2
.na
\fBzfs_zil_clean_taskq_minalloc\fR (int)
.ad
.RS 12n
The number of taskq entries that are pre-populated when the taskq is first
created and are immediately available for use.
.sp
Default value: \fB1024\fR.
.RE
.sp
.ne 2
.na
\fBzfs_zil_clean_taskq_nthr_pct\fR (int)
.ad
.RS 12n
This controls the number of threads used by the dp_zil_clean_taskq. The default
value of 100% will create a maximum of one thread per cpu.
.sp
Default value: \fB100\fR.
.RE
.sp
.ne 2
.na