linux/arch
Jeff Dike 3eddddcf23 [PATCH] uml: breakpoint an arbitrary thread
This patch implements a stack trace for a thread, not unlike sysrq-t does.
The advantage to this is that a break point can be placed on showreqs, so that
upon showing the stack, you jump immediately into the debugger.  While sysrq-t
does the same thing, sysrq-t shows *all* threads stacks.  It also doesn't work
right now.  In the future, I thought it might be acceptable to make this show
all pids stacks, but perhaps leaving well enough alone and just using sysrq-t
would be okay.  For now, upon receiving the stack command, UML switches
context to that thread, dumps its registers, and then switches context back to
the original thread.  Since UML compacts all threads into one of 4 host
threads, this sort of mechanism could be expanded in the future to include
other debugging helpers that sysrq does not cover.

Note by jdike - The main benefit to this is that it brings an arbitrary thread
back into context, where it can be examined by gdb.  The fact that it dumps it
stack is secondary.  This provides the capability to examine a sleeping
thread, which has existed in tt mode, but not in skas mode until now.

Also, the other threads, that sysrq doesn't cover, can be gdb-ed directly
anyway.

Signed-off-by: Allan Graves<allan.graves@gmail.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-17 11:49:59 -07:00
..
alpha [PATCH] alpha: fix-up schedule_timeout() usage 2005-09-10 10:06:37 -07:00
arm [ARM] 2914/1: PXA Poodle: Add MMC and UDC support 2005-09-15 14:53:22 +01:00
arm26 [PATCH] Remove arch/arm26/boot/compressed/hw-bse.c 2005-09-17 11:49:59 -07:00
cris kbuild: rename prepare to archprepare to fix dependency chain 2005-09-11 22:30:22 +02:00
frv kbuild: frv,m32r,sparc64 introduce fake asm-offsets.h file 2005-09-09 22:47:53 +02:00
h8300 kbuild: h8300,m68knommu,sh,sh64 use generic asm-offsets.h support 2005-09-09 20:28:49 +02:00
i386 [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
ia64 [IA64] mca_drv cleanup 2005-09-16 10:39:40 -07:00
m32r [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
m68k Merge master.kernel.org:/pub/scm/linux/kernel/git/sam/kbuild 2005-09-09 15:46:49 -07:00
m68knommu [PATCH] m68knommu: startup code for the Drangen Engine 68328 based board 2005-09-12 20:04:15 -07:00
mips [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
parisc [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
ppc [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
ppc64 [PATCH] ppc64: Fix recent regression 2005-09-15 08:04:39 -07:00
s390 [PATCH] s390: kernel stack corruption 2005-09-17 11:49:59 -07:00
sh kbuild: rename prepare to archprepare to fix dependency chain 2005-09-11 22:30:22 +02:00
sh64 kbuild: rename prepare to archprepare to fix dependency chain 2005-09-11 22:30:22 +02:00
sparc [SPARC]: Fix dot-symbol exporting for good. 2005-09-11 20:14:07 -07:00
sparc64 [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
um [PATCH] uml: breakpoint an arbitrary thread 2005-09-17 11:49:59 -07:00
v850 [PATCH] V850: C99 initializers for hw_interrupt_type structures 2005-09-10 10:06:27 -07:00
x86_64 [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00
xtensa [LIB]: Consolidate _atomic_dec_and_lock() 2005-09-14 21:47:01 -07:00