cvs commit: src/sys/alpha/alpha db_trace.c src/sys/arm/arm
db_trace.c src/sys/conf files src/sys/i386/i386 db_trace.c
src/sys/ia64/ia64 db_trace.c src/sys/kern subr_stack.c
src/sys/powerpc/powerpc db_trace.c src/sys/sparc64/sparc64 ...
rwatson at FreeBSD.org
Wed Aug 3 11:30:41 GMT 2005
On Wed, 3 Aug 2005, Jeff Roberson wrote:
> Added files:
> sys/kern subr_stack.c
> sys/sys stack.h
> - Add support for saving stack traces and displaying them via printf(9)
> and KTR.
> Contributed by: Antoine Brodin <antoine.brodin at laposte.net>
> Concept code from: Neal Fachan <neal at isilon.com>
This sounds really great. I have a local /usr/src/sys/kern/kern_utrace.c
for back-tracing user application stacks that I find quite useful -- I
wonder if we could extend this to also work with user thread stacks? It
can be quite handy for determining how an application reached a
particularly obscure kernel state. It doesn't do the ELF magic, but does
reach into VM to determine what object+offset backs each page pointed to
by a return address.
Robert N M Watson
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