Add code to ddb to allow backtracing an arbitrary thread.

(show thread {address})

Remove the IDLE kse state and replace it with a change in
the way threads sahre KSEs. Every KSE now has a thread, which is
considered its "owner" however a KSE may also be lent to other
threads in the same group to allow completion of in-kernel work.
n this case the owner remains the same and the KSE will revert to the
owner when the other work has been completed.

All creations of upcalls etc. is now done from
kse_reassign() which in turn is called from mi_switch or
thread_exit(). This means that special code can be removed from
msleep() and cv_wait().

kse_release() does not leave a KSE with no thread any more but
converts the existing thread into teh KSE's owner, and sets it up
for doing an upcall. It is just inhibitted from being scheduled until
there is some reason to do an upcall.

Remove all trace of the kse_idle queue since it is no-longer needed.
"Idle" KSEs are now on the loanable queue.

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/ddb/ddb.h b/sys/ddb/ddb.h
index b706cc58c5b9..cd8839bcc457 100644
--- a/sys/ddb/ddb.h
+++ b/sys/ddb/ddb.h
@@ -104,6 +104,8 @@ void		db_trap(int type, int code);
 int		db_value_of_name(const char *name, db_expr_t *valuep);
 void		db_write_bytes(vm_offset_t addr, size_t size, char *data);
 				/* machine-dependent */
+void		db_stack_thread(db_expr_t addr, boolean_t have_addr,
+				db_expr_t count, char *modif);
 void		kdb_init(void);
 
 db_cmdfcn_t	db_breakpoint_cmd;
@@ -125,11 +127,11 @@ db_cmdfcn_t	db_trace_until_call_cmd;
 db_cmdfcn_t	db_trace_until_matching_cmd;
 db_cmdfcn_t	db_watchpoint_cmd;
 db_cmdfcn_t	db_write_cmd;
+db_cmdfcn_t	db_show_one_thread;
 
 #if 0
 db_cmdfcn_t	db_help_cmd;
 db_cmdfcn_t	db_show_all_threads;
-db_cmdfcn_t	db_show_one_thread;
 db_cmdfcn_t	ipc_port_print;
 db_cmdfcn_t	vm_page_print;
 #endif