Module Name: src
Committed By: riastradh
Date: Mon Aug 27 15:07:59 UTC 2018
Modified Files:
src/sys/external/bsd/drm2/linux: linux_rcu.c
Log Message:
dtrace sdt probes for linux rcu.
To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/sys/external/bsd/drm2/linux/linux_rcu.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/external/bsd/drm2/linux/linux_rcu.c
diff -u src/sys/external/bsd/drm2/linux/linux_rcu.c:1.3 src/sys/external/bsd/drm2/linux/linux_rcu.c:1.4
--- src/sys/external/bsd/drm2/linux/linux_rcu.c:1.3 Mon Aug 27 14:14:54 2018
+++ src/sys/external/bsd/drm2/linux/linux_rcu.c Mon Aug 27 15:07:59 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_rcu.c,v 1.3 2018/08/27 14:14:54 riastradh Exp $ */
+/* $NetBSD: linux_rcu.c,v 1.4 2018/08/27 15:07:59 riastradh Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,16 +30,28 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_rcu.c,v 1.3 2018/08/27 14:14:54 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_rcu.c,v 1.4 2018/08/27 15:07:59 riastradh Exp $");
#include <sys/types.h>
#include <sys/condvar.h>
+#include <sys/cpu.h>
#include <sys/kthread.h>
#include <sys/mutex.h>
+#include <sys/sdt.h>
#include <sys/xcall.h>
#include <linux/rcupdate.h>
+SDT_PROBE_DEFINE0(sdt, linux, rcu, synchronize__start);
+SDT_PROBE_DEFINE1(sdt, linux, rcu, synchronize__cpu, "unsigned"/*cpu*/);
+SDT_PROBE_DEFINE0(sdt, linux, rcu, synchronize__done);
+SDT_PROBE_DEFINE2(sdt, linux, rcu, call__queue,
+ "struct rcu_head *"/*head*/, "void (*)(struct rcu_head *)"/*callback*/);
+SDT_PROBE_DEFINE2(sdt, linux, rcu, call__run,
+ "struct rcu_head *"/*head*/, "void (*)(struct rcu_head *)"/*callback*/);
+SDT_PROBE_DEFINE2(sdt, linux, rcu, call__done,
+ "struct rcu_head *"/*head*/, "void (*)(struct rcu_head *)"/*callback*/);
+
static struct {
kmutex_t lock;
kcondvar_t cv;
@@ -49,15 +61,19 @@ static struct {
} gc __cacheline_aligned;
static void
-rcu_xc(void *a, void *b)
+synchronize_rcu_xc(void *a, void *b)
{
+
+ SDT_PROBE1(sdt, linux, rcu, synchronize__cpu, cpu_index(curcpu()));
}
void
synchronize_rcu(void)
{
- xc_wait(xc_broadcast(0, &rcu_xc, NULL, NULL));
+ SDT_PROBE0(sdt, linux, rcu, synchronize__start);
+ xc_wait(xc_broadcast(0, &synchronize_rcu_xc, NULL, NULL));
+ SDT_PROBE0(sdt, linux, rcu, synchronize__done);
}
void
@@ -70,6 +86,7 @@ call_rcu(struct rcu_head *head, void (*c
head->rcuh_next = gc.first;
gc.first = head;
cv_signal(&gc.cv);
+ SDT_PROBE2(sdt, linux, rcu, call__queue, head, callback);
mutex_exit(&gc.lock);
}
@@ -77,6 +94,7 @@ static void
gc_thread(void *cookie)
{
struct rcu_head *head, *next;
+ void (*callback)(struct rcu_head *);
mutex_enter(&gc.lock);
for (;;) {
@@ -95,7 +113,16 @@ gc_thread(void *cookie)
/* It is now safe to call the callbacks. */
for (; head != NULL; head = next) {
next = head->rcuh_next;
- (*head->rcuh_callback)(head);
+ callback = head->rcuh_callback;
+ SDT_PROBE2(sdt, linux, rcu, call__run,
+ head, callback);
+ (*callback)(head);
+ /*
+ * Can't dereference head or invoke
+ * callback after this point.
+ */
+ SDT_PROBE2(sdt, linux, rcu, call__done,
+ head, callback);
}
mutex_enter(&gc.lock);
