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9b4ed67d2528bc9c1d2a6b94de7678920437a18e
xen/patches/linux-2.6.16.29/xenoprof-generic.patch
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kfraser@localhost.localdomain 2ccfcd7a09 [XENOPROF] Oprofile user level samples for passive domains are being lost. 
The number of of lost samples is most significant when dom0 is idle.

From: joserenato.santos@hp.com
Signed-off-by: Keir Fraser <keir@xensource.com>
2006-11-09 11:47:42 +00:00

663 lines
19 KiB
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diff -pruN ../orig-linux-2.6.16.29/drivers/oprofile/buffer_sync.c ./drivers/oprofile/buffer_sync.c
--- ../orig-linux-2.6.16.29/drivers/oprofile/buffer_sync.c 2006-11-06 14:46:52.000000000 -0800
+++ ./drivers/oprofile/buffer_sync.c 2006-11-06 15:16:52.000000000 -0800
@@ -6,6 +6,10 @@
*
* @author John Levon <levon@movementarian.org>
*
+ * Modified by Aravind Menon for Xen
+ * These modifications are:
+ * Copyright (C) 2005 Hewlett-Packard Co.
+ *
* This is the core of the buffer management. Each
* CPU buffer is processed and entered into the
* global event buffer. Such processing is necessary
@@ -38,6 +42,7 @@ static cpumask_t marked_cpus = CPU_MASK_
static DEFINE_SPINLOCK(task_mortuary);
static void process_task_mortuary(void);
+static int cpu_current_domain[NR_CPUS];
/* Take ownership of the task struct and place it on the
* list for processing. Only after two full buffer syncs
@@ -146,6 +151,11 @@ static void end_sync(void)
int sync_start(void)
{
int err;
+ int i;
+
+ for (i = 0; i < NR_CPUS; i++) {
+ cpu_current_domain[i] = COORDINATOR_DOMAIN;
+ }
start_cpu_work();
@@ -275,15 +285,31 @@ static void add_cpu_switch(int i)
last_cookie = INVALID_COOKIE;
}
-static void add_kernel_ctx_switch(unsigned int in_kernel)
+static void add_cpu_mode_switch(unsigned int cpu_mode)
{
add_event_entry(ESCAPE_CODE);
- if (in_kernel)
- add_event_entry(KERNEL_ENTER_SWITCH_CODE);
- else
- add_event_entry(KERNEL_EXIT_SWITCH_CODE);
+ switch (cpu_mode) {
+ case CPU_MODE_USER:
+ add_event_entry(USER_ENTER_SWITCH_CODE);
+ break;
+ case CPU_MODE_KERNEL:
+ add_event_entry(KERNEL_ENTER_SWITCH_CODE);
+ break;
+ case CPU_MODE_XEN:
+ add_event_entry(XEN_ENTER_SWITCH_CODE);
+ break;
+ default:
+ break;
+ }
}
-
+
+static void add_domain_switch(unsigned long domain_id)
+{
+ add_event_entry(ESCAPE_CODE);
+ add_event_entry(DOMAIN_SWITCH_CODE);
+ add_event_entry(domain_id);
+}
+
static void
add_user_ctx_switch(struct task_struct const * task, unsigned long cookie)
{
@@ -348,9 +374,9 @@ static int add_us_sample(struct mm_struc
* for later lookup from userspace.
*/
static int
-add_sample(struct mm_struct * mm, struct op_sample * s, int in_kernel)
+add_sample(struct mm_struct * mm, struct op_sample * s, int cpu_mode)
{
- if (in_kernel) {
+ if (cpu_mode >= CPU_MODE_KERNEL) {
add_sample_entry(s->eip, s->event);
return 1;
} else if (mm) {
@@ -496,15 +522,21 @@ void sync_buffer(int cpu)
struct mm_struct *mm = NULL;
struct task_struct * new;
unsigned long cookie = 0;
- int in_kernel = 1;
+ int cpu_mode = 1;
unsigned int i;
sync_buffer_state state = sb_buffer_start;
unsigned long available;
+ int domain_switch = 0;
down(&buffer_sem);
add_cpu_switch(cpu);
+ /* We need to assign the first samples in this CPU buffer to the
+ same domain that we were processing at the last sync_buffer */
+ if (cpu_current_domain[cpu] != COORDINATOR_DOMAIN) {
+ add_domain_switch(cpu_current_domain[cpu]);
+ }
/* Remember, only we can modify tail_pos */
available = get_slots(cpu_buf);
@@ -512,16 +544,18 @@ void sync_buffer(int cpu)
for (i = 0; i < available; ++i) {
struct op_sample * s = &cpu_buf->buffer[cpu_buf->tail_pos];
- if (is_code(s->eip)) {
- if (s->event <= CPU_IS_KERNEL) {
- /* kernel/userspace switch */
- in_kernel = s->event;
+ if (is_code(s->eip) && !domain_switch) {
+ if (s->event <= CPU_MODE_XEN) {
+ /* xen/kernel/userspace switch */
+ cpu_mode = s->event;
if (state == sb_buffer_start)
state = sb_sample_start;
- add_kernel_ctx_switch(s->event);
+ add_cpu_mode_switch(s->event);
} else if (s->event == CPU_TRACE_BEGIN) {
state = sb_bt_start;
add_trace_begin();
+ } else if (s->event == CPU_DOMAIN_SWITCH) {
+ domain_switch = 1;
} else {
struct mm_struct * oldmm = mm;
@@ -535,11 +569,21 @@ void sync_buffer(int cpu)
add_user_ctx_switch(new, cookie);
}
} else {
- if (state >= sb_bt_start &&
- !add_sample(mm, s, in_kernel)) {
- if (state == sb_bt_start) {
- state = sb_bt_ignore;
- atomic_inc(&oprofile_stats.bt_lost_no_mapping);
+ if (domain_switch) {
+ cpu_current_domain[cpu] = s->eip;
+ add_domain_switch(s->eip);
+ domain_switch = 0;
+ } else {
+ if (cpu_current_domain[cpu] !=
+ COORDINATOR_DOMAIN) {
+ add_sample_entry(s->eip, s->event);
+ }
+ else if (state >= sb_bt_start &&
+ !add_sample(mm, s, cpu_mode)) {
+ if (state == sb_bt_start) {
+ state = sb_bt_ignore;
+ atomic_inc(&oprofile_stats.bt_lost_no_mapping);
+ }
}
}
}
@@ -548,6 +592,11 @@ void sync_buffer(int cpu)
}
release_mm(mm);
+ /* We reset domain to COORDINATOR at each CPU switch */
+ if (cpu_current_domain[cpu] != COORDINATOR_DOMAIN) {
+ add_domain_switch(COORDINATOR_DOMAIN);
+ }
+
mark_done(cpu);
up(&buffer_sem);
diff -pruN ../orig-linux-2.6.16.29/drivers/oprofile/cpu_buffer.c ./drivers/oprofile/cpu_buffer.c
--- ../orig-linux-2.6.16.29/drivers/oprofile/cpu_buffer.c 2006-11-06 14:46:52.000000000 -0800
+++ ./drivers/oprofile/cpu_buffer.c 2006-11-06 14:47:55.000000000 -0800
@@ -6,6 +6,10 @@
*
* @author John Levon <levon@movementarian.org>
*
+ * Modified by Aravind Menon for Xen
+ * These modifications are:
+ * Copyright (C) 2005 Hewlett-Packard Co.
+ *
* Each CPU has a local buffer that stores PC value/event
* pairs. We also log context switches when we notice them.
* Eventually each CPU's buffer is processed into the global
@@ -34,6 +38,8 @@ static void wq_sync_buffer(void *);
#define DEFAULT_TIMER_EXPIRE (HZ / 10)
static int work_enabled;
+static int32_t current_domain = COORDINATOR_DOMAIN;
+
void free_cpu_buffers(void)
{
int i;
@@ -58,7 +64,7 @@ int alloc_cpu_buffers(void)
goto fail;
b->last_task = NULL;
- b->last_is_kernel = -1;
+ b->last_cpu_mode = -1;
b->tracing = 0;
b->buffer_size = buffer_size;
b->tail_pos = 0;
@@ -114,7 +120,7 @@ void cpu_buffer_reset(struct oprofile_cp
* collected will populate the buffer with proper
* values to initialize the buffer
*/
- cpu_buf->last_is_kernel = -1;
+ cpu_buf->last_cpu_mode = -1;
cpu_buf->last_task = NULL;
}
@@ -164,13 +170,13 @@ add_code(struct oprofile_cpu_buffer * bu
* because of the head/tail separation of the writer and reader
* of the CPU buffer.
*
- * is_kernel is needed because on some architectures you cannot
+ * cpu_mode is needed because on some architectures you cannot
* tell if you are in kernel or user space simply by looking at
- * pc. We tag this in the buffer by generating kernel enter/exit
- * events whenever is_kernel changes
+ * pc. We tag this in the buffer by generating kernel/user (and xen)
+ * enter events whenever cpu_mode changes
*/
static int log_sample(struct oprofile_cpu_buffer * cpu_buf, unsigned long pc,
- int is_kernel, unsigned long event)
+ int cpu_mode, unsigned long event)
{
struct task_struct * task;
@@ -181,18 +187,18 @@ static int log_sample(struct oprofile_cp
return 0;
}
- is_kernel = !!is_kernel;
-
task = current;
/* notice a switch from user->kernel or vice versa */
- if (cpu_buf->last_is_kernel != is_kernel) {
- cpu_buf->last_is_kernel = is_kernel;
- add_code(cpu_buf, is_kernel);
+ if (cpu_buf->last_cpu_mode != cpu_mode) {
+ cpu_buf->last_cpu_mode = cpu_mode;
+ add_code(cpu_buf, cpu_mode);
}
-
+
/* notice a task switch */
- if (cpu_buf->last_task != task) {
+ /* if not processing other domain samples */
+ if ((cpu_buf->last_task != task) &&
+ (current_domain == COORDINATOR_DOMAIN)) {
cpu_buf->last_task = task;
add_code(cpu_buf, (unsigned long)task);
}
@@ -269,6 +275,25 @@ void oprofile_add_trace(unsigned long pc
add_sample(cpu_buf, pc, 0);
}
+int oprofile_add_domain_switch(int32_t domain_id)
+{
+ struct oprofile_cpu_buffer * cpu_buf = &cpu_buffer[smp_processor_id()];
+
+ /* should have space for switching into and out of domain
+ (2 slots each) plus one sample and one cpu mode switch */
+ if (((nr_available_slots(cpu_buf) < 6) &&
+ (domain_id != COORDINATOR_DOMAIN)) ||
+ (nr_available_slots(cpu_buf) < 2))
+ return 0;
+
+ add_code(cpu_buf, CPU_DOMAIN_SWITCH);
+ add_sample(cpu_buf, domain_id, 0);
+
+ current_domain = domain_id;
+
+ return 1;
+}
+
/*
* This serves to avoid cpu buffer overflow, and makes sure
* the task mortuary progresses
diff -pruN ../orig-linux-2.6.16.29/drivers/oprofile/cpu_buffer.h ./drivers/oprofile/cpu_buffer.h
--- ../orig-linux-2.6.16.29/drivers/oprofile/cpu_buffer.h 2006-11-06 14:46:52.000000000 -0800
+++ ./drivers/oprofile/cpu_buffer.h 2006-11-06 14:47:55.000000000 -0800
@@ -36,7 +36,7 @@ struct oprofile_cpu_buffer {
volatile unsigned long tail_pos;
unsigned long buffer_size;
struct task_struct * last_task;
- int last_is_kernel;
+ int last_cpu_mode;
int tracing;
struct op_sample * buffer;
unsigned long sample_received;
@@ -51,7 +51,10 @@ extern struct oprofile_cpu_buffer cpu_bu
void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf);
/* transient events for the CPU buffer -> event buffer */
-#define CPU_IS_KERNEL 1
-#define CPU_TRACE_BEGIN 2
+#define CPU_MODE_USER 0
+#define CPU_MODE_KERNEL 1
+#define CPU_MODE_XEN 2
+#define CPU_TRACE_BEGIN 3
+#define CPU_DOMAIN_SWITCH 4
#endif /* OPROFILE_CPU_BUFFER_H */
diff -pruN ../orig-linux-2.6.16.29/drivers/oprofile/event_buffer.h ./drivers/oprofile/event_buffer.h
--- ../orig-linux-2.6.16.29/drivers/oprofile/event_buffer.h 2006-11-06 14:46:52.000000000 -0800
+++ ./drivers/oprofile/event_buffer.h 2006-11-06 14:47:55.000000000 -0800
@@ -29,15 +29,20 @@ void wake_up_buffer_waiter(void);
#define CPU_SWITCH_CODE 2
#define COOKIE_SWITCH_CODE 3
#define KERNEL_ENTER_SWITCH_CODE 4
-#define KERNEL_EXIT_SWITCH_CODE 5
+#define USER_ENTER_SWITCH_CODE 5
#define MODULE_LOADED_CODE 6
#define CTX_TGID_CODE 7
#define TRACE_BEGIN_CODE 8
#define TRACE_END_CODE 9
+#define XEN_ENTER_SWITCH_CODE 10
+#define DOMAIN_SWITCH_CODE 11
#define INVALID_COOKIE ~0UL
#define NO_COOKIE 0UL
+/* Constant used to refer to coordinator domain (Xen) */
+#define COORDINATOR_DOMAIN -1
+
/* add data to the event buffer */
void add_event_entry(unsigned long data);
diff -pruN ../orig-linux-2.6.16.29/drivers/oprofile/oprof.c ./drivers/oprofile/oprof.c
--- ../orig-linux-2.6.16.29/drivers/oprofile/oprof.c 2006-11-06 14:46:52.000000000 -0800
+++ ./drivers/oprofile/oprof.c 2006-11-06 14:47:55.000000000 -0800
@@ -5,6 +5,10 @@
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
+ *
+ * Modified by Aravind Menon for Xen
+ * These modifications are:
+ * Copyright (C) 2005 Hewlett-Packard Co.
*/
#include <linux/kernel.h>
@@ -19,7 +23,7 @@
#include "cpu_buffer.h"
#include "buffer_sync.h"
#include "oprofile_stats.h"
-
+
struct oprofile_operations oprofile_ops;
unsigned long oprofile_started;
@@ -33,6 +37,32 @@ static DECLARE_MUTEX(start_sem);
*/
static int timer = 0;
+int oprofile_set_active(int active_domains[], unsigned int adomains)
+{
+ int err;
+
+ if (!oprofile_ops.set_active)
+ return -EINVAL;
+
+ down(&start_sem);
+ err = oprofile_ops.set_active(active_domains, adomains);
+ up(&start_sem);
+ return err;
+}
+
+int oprofile_set_passive(int passive_domains[], unsigned int pdomains)
+{
+ int err;
+
+ if (!oprofile_ops.set_passive)
+ return -EINVAL;
+
+ down(&start_sem);
+ err = oprofile_ops.set_passive(passive_domains, pdomains);
+ up(&start_sem);
+ return err;
+}
+
int oprofile_setup(void)
{
int err;
diff -pruN ../orig-linux-2.6.16.29/drivers/oprofile/oprof.h ./drivers/oprofile/oprof.h
--- ../orig-linux-2.6.16.29/drivers/oprofile/oprof.h 2006-11-06 14:46:52.000000000 -0800
+++ ./drivers/oprofile/oprof.h 2006-11-06 14:47:55.000000000 -0800
@@ -35,5 +35,8 @@ void oprofile_create_files(struct super_
void oprofile_timer_init(struct oprofile_operations * ops);
int oprofile_set_backtrace(unsigned long depth);
+
+int oprofile_set_active(int active_domains[], unsigned int adomains);
+int oprofile_set_passive(int passive_domains[], unsigned int pdomains);
#endif /* OPROF_H */
diff -pruN ../orig-linux-2.6.16.29/drivers/oprofile/oprofile_files.c ./drivers/oprofile/oprofile_files.c
--- ../orig-linux-2.6.16.29/drivers/oprofile/oprofile_files.c 2006-11-06 14:46:52.000000000 -0800
+++ ./drivers/oprofile/oprofile_files.c 2006-11-06 14:47:55.000000000 -0800
@@ -5,15 +5,21 @@
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
+ *
+ * Modified by Aravind Menon for Xen
+ * These modifications are:
+ * Copyright (C) 2005 Hewlett-Packard Co.
*/
#include <linux/fs.h>
#include <linux/oprofile.h>
+#include <asm/uaccess.h>
+#include <linux/ctype.h>
#include "event_buffer.h"
#include "oprofile_stats.h"
#include "oprof.h"
-
+
unsigned long fs_buffer_size = 131072;
unsigned long fs_cpu_buffer_size = 8192;
unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */
@@ -117,11 +123,202 @@ static ssize_t dump_write(struct file *
static struct file_operations dump_fops = {
.write = dump_write,
};
-
+
+#define TMPBUFSIZE 512
+
+static unsigned int adomains = 0;
+static int active_domains[MAX_OPROF_DOMAINS + 1];
+static DEFINE_MUTEX(adom_mutex);
+
+static ssize_t adomain_write(struct file * file, char const __user * buf,
+ size_t count, loff_t * offset)
+{
+ char *tmpbuf;
+ char *startp, *endp;
+ int i;
+ unsigned long val;
+ ssize_t retval = count;
+
+ if (*offset)
+ return -EINVAL;
+ if (count > TMPBUFSIZE - 1)
+ return -EINVAL;
+
+ if (!(tmpbuf = kmalloc(TMPBUFSIZE, GFP_KERNEL)))
+ return -ENOMEM;
+
+ if (copy_from_user(tmpbuf, buf, count)) {
+ kfree(tmpbuf);
+ return -EFAULT;
+ }
+ tmpbuf[count] = 0;
+
+ mutex_lock(&adom_mutex);
+
+ startp = tmpbuf;
+ /* Parse one more than MAX_OPROF_DOMAINS, for easy error checking */
+ for (i = 0; i <= MAX_OPROF_DOMAINS; i++) {
+ val = simple_strtoul(startp, &endp, 0);
+ if (endp == startp)
+ break;
+ while (ispunct(*endp) || isspace(*endp))
+ endp++;
+ active_domains[i] = val;
+ if (active_domains[i] != val)
+ /* Overflow, force error below */
+ i = MAX_OPROF_DOMAINS + 1;
+ startp = endp;
+ }
+ /* Force error on trailing junk */
+ adomains = *startp ? MAX_OPROF_DOMAINS + 1 : i;
+
+ kfree(tmpbuf);
+
+ if (adomains > MAX_OPROF_DOMAINS
+ || oprofile_set_active(active_domains, adomains)) {
+ adomains = 0;
+ retval = -EINVAL;
+ }
+
+ mutex_unlock(&adom_mutex);
+ return retval;
+}
+
+static ssize_t adomain_read(struct file * file, char __user * buf,
+ size_t count, loff_t * offset)
+{
+ char * tmpbuf;
+ size_t len;
+ int i;
+ ssize_t retval;
+
+ if (!(tmpbuf = kmalloc(TMPBUFSIZE, GFP_KERNEL)))
+ return -ENOMEM;
+
+ mutex_lock(&adom_mutex);
+
+ len = 0;
+ for (i = 0; i < adomains; i++)
+ len += snprintf(tmpbuf + len,
+ len < TMPBUFSIZE ? TMPBUFSIZE - len : 0,
+ "%u ", active_domains[i]);
+ WARN_ON(len > TMPBUFSIZE);
+ if (len != 0 && len <= TMPBUFSIZE)
+ tmpbuf[len-1] = '\n';
+
+ mutex_unlock(&adom_mutex);
+
+ retval = simple_read_from_buffer(buf, count, offset, tmpbuf, len);
+
+ kfree(tmpbuf);
+ return retval;
+}
+
+
+static struct file_operations active_domain_ops = {
+ .read = adomain_read,
+ .write = adomain_write,
+};
+
+static unsigned int pdomains = 0;
+static int passive_domains[MAX_OPROF_DOMAINS];
+static DEFINE_MUTEX(pdom_mutex);
+
+static ssize_t pdomain_write(struct file * file, char const __user * buf,
+ size_t count, loff_t * offset)
+{
+ char *tmpbuf;
+ char *startp, *endp;
+ int i;
+ unsigned long val;
+ ssize_t retval = count;
+
+ if (*offset)
+ return -EINVAL;
+ if (count > TMPBUFSIZE - 1)
+ return -EINVAL;
+
+ if (!(tmpbuf = kmalloc(TMPBUFSIZE, GFP_KERNEL)))
+ return -ENOMEM;
+
+ if (copy_from_user(tmpbuf, buf, count)) {
+ kfree(tmpbuf);
+ return -EFAULT;
+ }
+ tmpbuf[count] = 0;
+
+ mutex_lock(&pdom_mutex);
+
+ startp = tmpbuf;
+ /* Parse one more than MAX_OPROF_DOMAINS, for easy error checking */
+ for (i = 0; i <= MAX_OPROF_DOMAINS; i++) {
+ val = simple_strtoul(startp, &endp, 0);
+ if (endp == startp)
+ break;
+ while (ispunct(*endp) || isspace(*endp))
+ endp++;
+ passive_domains[i] = val;
+ if (passive_domains[i] != val)
+ /* Overflow, force error below */
+ i = MAX_OPROF_DOMAINS + 1;
+ startp = endp;
+ }
+ /* Force error on trailing junk */
+ pdomains = *startp ? MAX_OPROF_DOMAINS + 1 : i;
+
+ kfree(tmpbuf);
+
+ if (pdomains > MAX_OPROF_DOMAINS
+ || oprofile_set_passive(passive_domains, pdomains)) {
+ pdomains = 0;
+ retval = -EINVAL;
+ }
+
+ mutex_unlock(&pdom_mutex);
+ return retval;
+}
+
+static ssize_t pdomain_read(struct file * file, char __user * buf,
+ size_t count, loff_t * offset)
+{
+ char * tmpbuf;
+ size_t len;
+ int i;
+ ssize_t retval;
+
+ if (!(tmpbuf = kmalloc(TMPBUFSIZE, GFP_KERNEL)))
+ return -ENOMEM;
+
+ mutex_lock(&pdom_mutex);
+
+ len = 0;
+ for (i = 0; i < pdomains; i++)
+ len += snprintf(tmpbuf + len,
+ len < TMPBUFSIZE ? TMPBUFSIZE - len : 0,
+ "%u ", passive_domains[i]);
+ WARN_ON(len > TMPBUFSIZE);
+ if (len != 0 && len <= TMPBUFSIZE)
+ tmpbuf[len-1] = '\n';
+
+ mutex_unlock(&pdom_mutex);
+
+ retval = simple_read_from_buffer(buf, count, offset, tmpbuf, len);
+
+ kfree(tmpbuf);
+ return retval;
+}
+
+static struct file_operations passive_domain_ops = {
+ .read = pdomain_read,
+ .write = pdomain_write,
+};
+
void oprofile_create_files(struct super_block * sb, struct dentry * root)
{
oprofilefs_create_file(sb, root, "enable", &enable_fops);
oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
+ oprofilefs_create_file(sb, root, "active_domains", &active_domain_ops);
+ oprofilefs_create_file(sb, root, "passive_domains", &passive_domain_ops);
oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
oprofilefs_create_ulong(sb, root, "buffer_size", &fs_buffer_size);
oprofilefs_create_ulong(sb, root, "buffer_watershed", &fs_buffer_watershed);
diff -pruN ../orig-linux-2.6.16.29/include/linux/oprofile.h ./include/linux/oprofile.h
--- ../orig-linux-2.6.16.29/include/linux/oprofile.h 2006-11-06 14:46:42.000000000 -0800
+++ ./include/linux/oprofile.h 2006-11-06 14:47:55.000000000 -0800
@@ -16,6 +16,8 @@
#include <linux/types.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>
+
+#include <xen/interface/xenoprof.h>
struct super_block;
struct dentry;
@@ -27,6 +29,11 @@ struct oprofile_operations {
/* create any necessary configuration files in the oprofile fs.
* Optional. */
int (*create_files)(struct super_block * sb, struct dentry * root);
+ /* setup active domains with Xen */
+ int (*set_active)(int *active_domains, unsigned int adomains);
+ /* setup passive domains with Xen */
+ int (*set_passive)(int *passive_domains, unsigned int pdomains);
+
/* Do any necessary interrupt setup. Optional. */
int (*setup)(void);
/* Do any necessary interrupt shutdown. Optional. */
@@ -68,6 +75,8 @@ void oprofile_add_pc(unsigned long pc, i
/* add a backtrace entry, to be called from the ->backtrace callback */
void oprofile_add_trace(unsigned long eip);
+/* add a domain switch entry */
+int oprofile_add_domain_switch(int32_t domain_id);
/**
* Create a file of the given name as a child of the given root, with
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