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Limit number of tasks shown in taskq proc

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To prevent holding tq_lock for too long.

Before zfsonlinux/zfs@8e71ab9, hogging delay tasks and cat /proc/spl/taskq
would easily cause a lockup. While that bug has been fixed. It's probably
still a good idea to do this just in case task lists grow too large.

Reviewed-by: Tim Chase <tim@chase2k.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Closes #586
This commit is contained in:
Chunwei Chen
2016-12-01 10:06:27 -08:00
committed by Brian Behlendorf
parent cbba714667
commit 493492559e
2 changed files with 28 additions and 6 deletions
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man/man5/spl-module-parameters.5
+15
View File
@@ -326,3 +326,18 @@ configurations.
.sp
Default value: \fB4\fR
.RE
.sp
.ne 2
.na
\fBspl_max_show_tasks\fR (uint)
.ad
.RS 12n
The maximum number of tasks per pending list in each taskq shown in
/proc/spl/{taskq,taskq-all}. Write 0 to turn off the limit. The proc file will
walk the lists with lock held, reading it could cause a lock up if the list
grow too large without limiting the output. "(truncated)" will be shown if the
list is larger than the limit.
.sp
Default value: \fB512\fR
.RE