[PATCH] [V2] add options to ps(1) to display lwp data

[Simon 'corecode' Schubert]

Nicolas Thery wrote:
Changed sysctl(KERN_PROC, ...) behaviour for kernel threads not associated
with lwps.  kinfo_lwp.kl_tid is set to -1 in this case instead of thread
structure address.  This is consistent with kinfo_proc.kp_pid, avoid
garbage values in ps -axH output and should not break anything as kl_tid
is not used anywhere in the source tree.

Index: dfly/src/sys/kern/kern_kinfo.c
===================================================================
--- dfly.orig/src/sys/kern/kern_kinfo.c	2007-08-14 21:35:18.000000000 +0200
+++ dfly/src/sys/kern/kern_kinfo.c	2007-08-14 21:36:39.000000000 +0200
@@ -218,7 +218,7 @@
 	kp->kp_stat = SACTIVE;
 	kp->kp_lwp.kl_pid = -1;
-	kp->kp_lwp.kl_tid = (uintptr_t)td;
+	kp->kp_lwp.kl_tid = -1;
 	kp->kp_lwp.kl_tdflags = td->td_flags;
 #ifdef SMP
 	kp->kp_lwp.kl_mpcount = td->td_mpcount;
I don't think this is good.  td is the "thread id", and nothing else.  Now you've removed the only possible identifier for a kernel thread.

This needs to be reverted, and ps extended to use %#x or so

cheers
 simon
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