linux-kernel - Re: [PATCH RT 0/6] lockstat measurement extensions

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Date:	Thu, 13 Mar 2008 17:40:08 -0700
From:	"Bill Huey (hui)" <bill.huey@...il.com>
To:	"Gregory Haskins" <ghaskins@...ell.com>, mingo@...e.hu
Cc:	a.p.zijlstra@...llo.nl, tglx@...utronix.de, rostedt@...dmis.org,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	kevin@...man.org, cminyard@...sta.com, dsingleton@...sta.com,
	dwalker@...sta.com, npiggin@...e.de, dsaxena@...xity.net,
	ak@...e.de, pavel@....cz, acme@...hat.com, gregkh@...e.de,
	sdietrich@...ell.com, pmorreale@...ell.com, mkohari@...ell.com
Subject: Re: [PATCH RT 0/6] lockstat measurement extensions

Sorry missing the patch. At Thomas's urging, this is inlined:

--- linux-2.6.24/kernel/sched.c	2008-02-25 15:32:05.000000000 -0800
+++ linux-2.6.24.working/kernel/sched.c	2008-03-13 13:53:24.000000000 -0700
@@ -1175,6 +1175,20 @@
 	return cpu_curr(task_cpu(p)) == p;
 }

+int task_spinnable(struct task_struct *p)
+{
+/*
+ * The use of task_curr can crash the system since the struct
thread_info seems
+ * to disappear when dereferenced arbitrarily, so becareful.
+ */
+#ifdef CONFIG_SMP
+	if (p && p->se.on_rq && task_curr(p))
+		return 1;
+#else
+	return 0;
+#endif
+}
+
 /* Used instead of source_load when we know the type == 0 */
 unsigned long weighted_cpuload(const int cpu)
 {
@@ -1239,6 +1253,11 @@
 		      *new_cfsrq = cpu_cfs_rq(old_cfsrq, new_cpu);
 	u64 clock_offset;

+//--billh
+//	if (old_cpu >= NR_CPUS)
+//		panic("bogus cpu id %u\n", old_cpu);
+//
+//
 	clock_offset = old_rq->clock - new_rq->clock;

 #ifdef CONFIG_SCHEDSTATS
--
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