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Make user stack limit configurable

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To aid in detecting and debugging stack overflow issues make the
user space stack limit configurable via a new ZFS_STACK_SIZE
environment variable.  The value assigned to ZFS_STACK_SIZE will
be used as the default stack size in bytes.

Because this is mainly useful as a debugging aid in conjunction
with ztest the stack limit is disabled by default.  See the ztest(1)
man page for additional details on using the ZFS_STACK_SIZE
environment variable.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Closes #2743
Issue #2293
This commit is contained in:
Brian Behlendorf
2014-09-25 15:15:45 -07:00
parent cb08f06307
commit aa0ac7caa4
3 changed files with 47 additions and 30 deletions
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man/man1/ztest.1
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@@ -144,6 +144,22 @@ Maybe you'd like to run ztest for longer? To do so simply use the -T
option and specify the runlength in seconds like so:
.IP
ztest -f / -V -T 120
.SH "ENVIRONMENT VARIABLES"
.TP
.B "ZFS_STACK_SIZE=stacksize"
Limit the default stack size to \fBstacksize\fR bytes for the purpose of
detecting and debugging kernel stack overflows. For x86_64 platforms this
value should be set as follows to simulate these platforms: \fB8192\fR
(Linux), \fB20480\fR (Illumos), \fB16384\fR (FreeBSD).
In practice you may need to set these value slightly higher because
differences in stack usage between kernel and user space can lead to spurious
stack overflows (especially when debugging is enabled). The specified value
will be rounded up to a floor of PTHREAD_STACK_MIN which is the minimum stack
required for a NULL procedure in user space.
By default the stack size is limited to 256K.
.SH "SEE ALSO"
.BR "zpool (1)" ","
.BR "zfs (1)" ","