- Implement a mechanism for allowing schedulers to place scheduler dependant

   data in the scheduler independant structures (proc, ksegrp, kse, thread).
 - Implement unused stubs for this mechanism in sched_4bsd.

Approved by:	re
Reviewed by:	luigi, trb
Tested on:	x86, alpha

5 files changed, 96 insertions, 47 deletions

diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 933c25c..4da2377 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -64,6 +64,7 @@
 #include <sys/vnode.h>
 #include <sys/sysent.h>
 #include <sys/reboot.h>
+#include <sys/sched.h>
 #include <sys/sx.h>
 #include <sys/sysproto.h>
 #include <sys/vmmeter.h>
@@ -316,6 +317,11 @@ proc0_init(void *dummy __unused)
 	ke = &kse0;
 	kg = &ksegrp0;
 
+	ke->ke_sched = kse0_sched;
+	kg->kg_sched = ksegrp0_sched;
+	p->p_sched = proc0_sched;
+	td->td_sched = thread0_sched;
+
 	/*
 	 * Initialize magic number.
 	 */
diff --git a/sys/kern/kern_kse.c b/sys/kern/kern_kse.c
index 6a92914..45ac5c0 100644
--- a/sys/kern/kern_kse.c
+++ b/sys/kern/kern_kse.c
@@ -39,9 +39,10 @@
 #include <sys/sysctl.h>
 #include <sys/sysproto.h>
 #include <sys/filedesc.h>
-#include <sys/tty.h>
+#include <sys/sched.h>
 #include <sys/signalvar.h>
 #include <sys/sx.h>
+#include <sys/tty.h>
 #include <sys/user.h>
 #include <sys/jail.h>
 #include <sys/kse.h>
@@ -101,9 +102,6 @@ thread_ctor(void *mem, int size, void *arg)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 	td->td_state = TDS_INACTIVE;
 	td->td_flags |= TDF_UNBOUND;
@@ -117,9 +115,6 @@ thread_dtor(void *mem, int size, void *arg)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 
 #ifdef INVARIANTS
@@ -152,14 +147,12 @@ thread_init(void *mem, int size)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 	mtx_lock(&Giant);
 	pmap_new_thread(td, 0);
 	mtx_unlock(&Giant);
 	cpu_thread_setup(td);
+	td->td_sched = (struct td_sched *)&td[1];
 }
 
 /*
@@ -170,12 +163,31 @@ thread_fini(void *mem, int size)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 	pmap_dispose_thread(td);
 }
+/*
+ * Initialize type-stable parts of a kse (when newly created).
+ */
+static void
+kse_init(void *mem, int size)
+{
+	struct kse	*ke;
+
+	ke = (struct kse *)mem;
+	ke->ke_sched = (struct ke_sched *)&ke[1];
+}
+/*
+ * Initialize type-stable parts of a ksegrp (when newly created).
+ */
+static void
+ksegrp_init(void *mem, int size)
+{
+	struct ksegrp	*kg;
+
+	kg = (struct ksegrp *)mem;
+	kg->kg_sched = (struct kg_sched *)&kg[1];
+}
 
 /* 
  * KSE is linked onto the idle queue.
@@ -609,7 +621,7 @@ threadinit(void)
 {
 
 #ifndef __ia64__
-	thread_zone = uma_zcreate("THREAD", sizeof (struct thread),
+	thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(),
 	    thread_ctor, thread_dtor, thread_init, thread_fini,
 	    UMA_ALIGN_CACHE, 0);
 #else
@@ -620,16 +632,16 @@ threadinit(void)
 	 * in the system startup while contigmalloc() still works. Once we
 	 * have them, keep them.  Sigh.
 	 */
-	thread_zone = uma_zcreate("THREAD", sizeof (struct thread),
+	thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(),
 	    thread_ctor, thread_dtor, thread_init, thread_fini,
 	    UMA_ALIGN_CACHE, UMA_ZONE_NOFREE);
 	uma_prealloc(thread_zone, 512);		/* XXX arbitary */
 #endif
-	ksegrp_zone = uma_zcreate("KSEGRP", sizeof (struct ksegrp),
-	    NULL, NULL, NULL, NULL,
+	ksegrp_zone = uma_zcreate("KSEGRP", sched_sizeof_ksegrp(),
+	    NULL, NULL, ksegrp_init, NULL,
 	    UMA_ALIGN_CACHE, 0);
-	kse_zone = uma_zcreate("KSE", sizeof (struct kse),
-	    NULL, NULL, NULL, NULL,
+	kse_zone = uma_zcreate("KSE", sched_sizeof_kse(),
+	    NULL, NULL, kse_init, NULL,
 	    UMA_ALIGN_CACHE, 0);
 }
 
diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index a016bba..cf9de34 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -45,6 +45,7 @@
 #include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/kse.h>
+#include <sys/sched.h>
 #include <sys/smp.h>
 #include <sys/sysctl.h>
 #include <sys/filedesc.h>
@@ -123,7 +124,7 @@ procinit()
 	LIST_INIT(&zombproc);
 	pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
 	pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
-	proc_zone = uma_zcreate("PROC", sizeof (struct proc),
+	proc_zone = uma_zcreate("PROC", sched_sizeof_proc(),
 	    proc_ctor, proc_dtor, proc_init, proc_fini,
 	    UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
 	uihashinit();
@@ -137,8 +138,6 @@ proc_ctor(void *mem, int size, void *arg)
 {
 	struct proc *p;
 
-	KASSERT((size == sizeof(struct proc)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct proc)));
 	p = (struct proc *)mem;
 }
 
@@ -154,8 +153,6 @@ proc_dtor(void *mem, int size, void *arg)
 	struct kse *ke;
 
 	/* INVARIANTS checks go here */
-	KASSERT((size == sizeof(struct proc)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct proc)));
 	p = (struct proc *)mem;
 	KASSERT((p->p_numthreads == 1),
 	    ("bad number of threads in exiting process"));
@@ -194,9 +191,8 @@ proc_init(void *mem, int size)
 	struct ksegrp *kg;
 	struct kse *ke;
 
-	KASSERT((size == sizeof(struct proc)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct proc)));
 	p = (struct proc *)mem;
+	p->p_sched = (struct p_sched *)&p[1];
 	vm_proc_new(p);
 	td = thread_alloc();
 	ke = kse_alloc();
@@ -215,8 +211,6 @@ proc_fini(void *mem, int size)
 	struct ksegrp *kg;
 	struct kse *ke;
 
-	KASSERT((size == sizeof(struct proc)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct proc)));
 	p = (struct proc *)mem;
 	KASSERT((p->p_numthreads == 1),
 	    ("bad number of threads in freeing process"));
diff --git a/sys/kern/kern_thread.c b/sys/kern/kern_thread.c
index 6a92914..45ac5c0 100644
--- a/sys/kern/kern_thread.c
+++ b/sys/kern/kern_thread.c
@@ -39,9 +39,10 @@
 #include <sys/sysctl.h>
 #include <sys/sysproto.h>
 #include <sys/filedesc.h>
-#include <sys/tty.h>
+#include <sys/sched.h>
 #include <sys/signalvar.h>
 #include <sys/sx.h>
+#include <sys/tty.h>
 #include <sys/user.h>
 #include <sys/jail.h>
 #include <sys/kse.h>
@@ -101,9 +102,6 @@ thread_ctor(void *mem, int size, void *arg)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 	td->td_state = TDS_INACTIVE;
 	td->td_flags |= TDF_UNBOUND;
@@ -117,9 +115,6 @@ thread_dtor(void *mem, int size, void *arg)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 
 #ifdef INVARIANTS
@@ -152,14 +147,12 @@ thread_init(void *mem, int size)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 	mtx_lock(&Giant);
 	pmap_new_thread(td, 0);
 	mtx_unlock(&Giant);
 	cpu_thread_setup(td);
+	td->td_sched = (struct td_sched *)&td[1];
 }
 
 /*
@@ -170,12 +163,31 @@ thread_fini(void *mem, int size)
 {
 	struct thread	*td;
 
-	KASSERT((size == sizeof(struct thread)),
-	    ("size mismatch: %d != %d\n", size, (int)sizeof(struct thread)));
-
 	td = (struct thread *)mem;
 	pmap_dispose_thread(td);
 }
+/*
+ * Initialize type-stable parts of a kse (when newly created).
+ */
+static void
+kse_init(void *mem, int size)
+{
+	struct kse	*ke;
+
+	ke = (struct kse *)mem;
+	ke->ke_sched = (struct ke_sched *)&ke[1];
+}
+/*
+ * Initialize type-stable parts of a ksegrp (when newly created).
+ */
+static void
+ksegrp_init(void *mem, int size)
+{
+	struct ksegrp	*kg;
+
+	kg = (struct ksegrp *)mem;
+	kg->kg_sched = (struct kg_sched *)&kg[1];
+}
 
 /* 
  * KSE is linked onto the idle queue.
@@ -609,7 +621,7 @@ threadinit(void)
 {
 
 #ifndef __ia64__
-	thread_zone = uma_zcreate("THREAD", sizeof (struct thread),
+	thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(),
 	    thread_ctor, thread_dtor, thread_init, thread_fini,
 	    UMA_ALIGN_CACHE, 0);
 #else
@@ -620,16 +632,16 @@ threadinit(void)
 	 * in the system startup while contigmalloc() still works. Once we
 	 * have them, keep them.  Sigh.
 	 */
-	thread_zone = uma_zcreate("THREAD", sizeof (struct thread),
+	thread_zone = uma_zcreate("THREAD", sched_sizeof_thread(),
 	    thread_ctor, thread_dtor, thread_init, thread_fini,
 	    UMA_ALIGN_CACHE, UMA_ZONE_NOFREE);
 	uma_prealloc(thread_zone, 512);		/* XXX arbitary */
 #endif
-	ksegrp_zone = uma_zcreate("KSEGRP", sizeof (struct ksegrp),
-	    NULL, NULL, NULL, NULL,
+	ksegrp_zone = uma_zcreate("KSEGRP", sched_sizeof_ksegrp(),
+	    NULL, NULL, ksegrp_init, NULL,
 	    UMA_ALIGN_CACHE, 0);
-	kse_zone = uma_zcreate("KSE", sizeof (struct kse),
-	    NULL, NULL, NULL, NULL,
+	kse_zone = uma_zcreate("KSE", sched_sizeof_kse(),
+	    NULL, NULL, kse_init, NULL,
 	    UMA_ALIGN_CACHE, 0);
 }
 
diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c
index c57262f..236a3c7 100644
--- a/sys/kern/sched_4bsd.c
+++ b/sys/kern/sched_4bsd.c
@@ -51,6 +51,10 @@
 #include <sys/sysctl.h>
 #include <sys/sx.h>
 
+struct ke_sched *kse0_sched = NULL;
+struct kg_sched *ksegrp0_sched = NULL;
+struct p_sched *proc0_sched = NULL;
+struct td_sched *thread0_sched = NULL;
 
 static int	sched_quantum;	/* Roundrobin scheduling quantum in ticks. */
 #define	SCHED_QUANTUM	(hz / 10);	/* Default sched quantum */
@@ -618,3 +622,24 @@ sched_userret(struct thread *td)
 		mtx_unlock_spin(&sched_lock);
 	}
 }
+
+int
+sched_sizeof_kse(void)
+{
+	return (sizeof(struct kse));
+}
+int
+sched_sizeof_ksegrp(void)
+{
+	return (sizeof(struct ksegrp));
+}
+int
+sched_sizeof_proc(void)
+{
+	return (sizeof(struct proc));
+}
+int
+sched_sizeof_thread(void)
+{
+	return (sizeof(struct thread));
+}