Date: Wed, 8 Nov 2000 01:22:22 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Jacques Fourie <jacques4i@yahoo.com> Cc: freebsd-hackers@freebsd.org Subject: Re: kernel stack size? Message-ID: <200011080922.eA89MMQ98018@earth.backplane.com> References: <20001108082135.21027.qmail@web3504.mail.yahoo.com>
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:Would it be possible to pre-allocate a block of memory
:and then "switch" stacks in my interrupt routine? This
:may be far off, but my only other option is going
:through ~10000 lines of code and examining all places
:where local variables are declared. If I could somehow
:do this in a different way, it would really help a
:lot.
:
:regards,
:jacques
I think you are stuck. I would transplant most of the code into
a user level process and have the interrupt and device driver
just deal with getting the data to and from the user process.
You can theoretically increase UPAGES in /usr/src/sys/i386/include/param.h
but I dunno if that would work, and it would increase the size of
every kernel stack for every process in the system. I get the
feeling that your code eats more then just a few kilobytes of stack.
It doesn't sound like something that belongs in the kernel. The
only other choice would be to rewrite the code into a form suitable
for the kernel's smaller stack.
-Matt
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