PSARC 2008/138 Soft CPU and processor set bindings

6656791 Weaker CPU and processor set bindings is useful

4 files changed, 29 insertions, 6 deletions

diff --git a/usr/src/uts/common/sys/cpuvar.h b/usr/src/uts/common/sys/cpuvar.h
index c7b76b32ea..cd0d027866 100644
--- a/usr/src/uts/common/sys/cpuvar.h
+++ b/usr/src/uts/common/sys/cpuvar.h
@@ -668,7 +668,7 @@ void	cpu_destroy_bound_threads(cpu_t *cp);
 
 extern int cpu_bind_thread(kthread_t *tp, processorid_t bind,
     processorid_t *obind, int *error);
-extern int cpu_unbind(processorid_t cpu_id);
+extern int cpu_unbind(processorid_t cpu_id, boolean_t force);
 extern void thread_affinity_set(kthread_t *t, int cpu_id);
 extern void thread_affinity_clear(kthread_t *t);
 extern void affinity_set(int cpu_id);
diff --git a/usr/src/uts/common/sys/processor.h b/usr/src/uts/common/sys/processor.h
index 4d6f90e988..3a76c8c9b4 100644
--- a/usr/src/uts/common/sys/processor.h
+++ b/usr/src/uts/common/sys/processor.h
@@ -25,7 +25,7 @@
  */
 
 /*
- * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -106,6 +106,9 @@ typedef struct {
  */
 #define	PBIND_NONE	-1	/* LWP/thread is not bound */
 #define	PBIND_QUERY	-2	/* don't set, just return the binding */
+#define	PBIND_HARD	-3	/* prevents offlining CPU (default) */
+#define	PBIND_SOFT	-4	/* allows offlining CPU */
+#define	PBIND_QUERY_TYPE	-5	/* Return binding type */
 
 /*
  * User-level system call interface prototypes
diff --git a/usr/src/uts/common/sys/pset.h b/usr/src/uts/common/sys/pset.h
index 395b3850a8..f98e327620 100644
--- a/usr/src/uts/common/sys/pset.h
+++ b/usr/src/uts/common/sys/pset.h
@@ -2,9 +2,8 @@
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
- * Common Development and Distribution License, Version 1.0 only
- * (the "License").  You may not use this file except in compliance
- * with the License.
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
@@ -20,7 +19,7 @@
  * CDDL HEADER END
  */
 /*
- * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -45,6 +44,9 @@ typedef int psetid_t;
 #define	PS_NONE		-1
 #define	PS_QUERY	-2
 #define	PS_MYID		-3
+#define	PS_SOFT		-4
+#define	PS_HARD		-5
+#define	PS_QUERY_TYPE	-6
 
 /* types of processor sets */
 #define	PS_SYSTEM	1
diff --git a/usr/src/uts/common/sys/thread.h b/usr/src/uts/common/sys/thread.h
index 6fced086b3..eee18d53f9 100644
--- a/usr/src/uts/common/sys/thread.h
+++ b/usr/src/uts/common/sys/thread.h
@@ -125,6 +125,7 @@ typedef struct _kthread {
 	pri_t	t_epri;		/* inherited thread priority */
 	pri_t	t_cpri;		/* thread scheduling class priority */
 	char	t_writer;	/* sleeping in lwp_rwlock_lock(RW_WRITE_LOCK) */
+	uchar_t	t_bindflag;	/* CPU and pset binding type */
 	label_t	t_pcb;		/* pcb, save area when switching */
 	lwpchan_t t_lwpchan;	/* reason for blocking */
 #define	t_wchan0	t_lwpchan.lc_wchan0
@@ -415,6 +416,21 @@ typedef struct _kthread {
 #define	TS_ANYWAITQ	(TS_PROJWAITQ|TS_ZONEWAITQ)
 
 /*
+ * Thread binding types
+ */
+#define	TB_ALLHARD	0
+#define	TB_CPU_SOFT	0x01		/* soft binding to CPU */
+#define	TB_PSET_SOFT	0x02		/* soft binding to pset */
+
+#define	TB_CPU_SOFT_SET(t)		((t)->t_bindflag |= TB_CPU_SOFT)
+#define	TB_CPU_HARD_SET(t)		((t)->t_bindflag &= ~TB_CPU_SOFT)
+#define	TB_PSET_SOFT_SET(t)		((t)->t_bindflag |= TB_PSET_SOFT)
+#define	TB_PSET_HARD_SET(t)		((t)->t_bindflag &= ~TB_PSET_SOFT)
+#define	TB_CPU_IS_SOFT(t)		((t)->t_bindflag & TB_CPU_SOFT)
+#define	TB_CPU_IS_HARD(t)		(!TB_CPU_IS_SOFT(t))
+#define	TB_PSET_IS_SOFT(t)		((t)->t_bindflag & TB_PSET_SOFT)
+
+/*
  * No locking needed for AST field.
  */
 #define	aston(t)		((t)->t_astflag = 1)
@@ -564,6 +580,8 @@ extern disp_lock_t stop_lock;		/* lock protecting stopped threads */
 
 caddr_t	thread_stk_init(caddr_t);	/* init thread stack */
 
+extern int default_binding_mode;
+
 #endif	/* _KERNEL */
 
 /*