Re: Setting the default MAX Stack size

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From
Bruce Evans <bde@zeta.org.au>
Date
21 Jul 2001 04:43:02
Subject
Re: Setting the default MAX Stack size
Message-ID
Pine.BSF.4.21.0107212108330.17436-100000@besplex.bde.org

In reply to

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On Wed, 18 Jul 2001, Jim Pirzyk wrote:

> So I have a need to increase the max stack size in the kernel. There
> currently is no knob to do this. I though of implementing it like
> the max data size knob (MAXDSIZ). Is this the best answer or should
> it maybe be done via read only sysctl (and then can be set in the
> /boot/loader.conf)? I know how to do the former, but I am not sure
> about the latter.

This (set MAXSSIZ in the same way as MAXDSIZ) is the best answer. There
is no point in making it more tunable than MAXDSIZ.

Notes:
- MAXSSIZ used to be an option, just like MAXDSIZ. There are ifdefs for
both in <machine/vmparam.h>. This was broken by not putting MAXSSIZ in
sys/conf/options.
- the stack size should normally be limited using login.conf or the
stack size rlimit. These don't apply here because MAXSSIZ gives
the maximum that can be set using these.

Bruce


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