perf: Do the big rename: Performance Counters -> Performance Events

Bye-bye Performance Counters, welcome Performance Events!

In the past few months the perfcounters subsystem has grown out its
initial role of counting hardware events, and has become (and is
becoming) a much broader generic event enumeration, reporting, logging,
monitoring, analysis facility.

Naming its core object 'perf_counter' and naming the subsystem
'perfcounters' has become more and more of a misnomer. With pending
code like hw-breakpoints support the 'counter' name is less and
less appropriate.

All in one, we've decided to rename the subsystem to 'performance
events' and to propagate this rename through all fields, variables
and API names. (in an ABI compatible fashion)

The word 'event' is also a bit shorter than 'counter' - which makes
it slightly more convenient to write/handle as well.

Thanks goes to Stephane Eranian who first observed this misnomer and
suggested a rename.

User-space tooling and ABI compatibility is not affected - this patch
should be function-invariant. (Also, defconfigs were not touched to
keep the size down.)

This patch has been generated via the following script:

  FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')

  sed -i \
    -e 's/PERF_EVENT_/PERF_RECORD_/g' \
    -e 's/PERF_COUNTER/PERF_EVENT/g' \
    -e 's/perf_counter/perf_event/g' \
    -e 's/nb_counters/nb_events/g' \
    -e 's/swcounter/swevent/g' \
    -e 's/tpcounter_event/tp_event/g' \
    $FILES

  for N in $(find . -name perf_counter.[ch]); do
    M=$(echo $N | sed 's/perf_counter/perf_event/g')
    mv $N $M
  done

  FILES=$(find . -name perf_event.*)

  sed -i \
    -e 's/COUNTER_MASK/REG_MASK/g' \
    -e 's/COUNTER/EVENT/g' \
    -e 's/\<event\>/event_id/g' \
    -e 's/counter/event/g' \
    -e 's/Counter/Event/g' \
    $FILES

... to keep it as correct as possible. This script can also be
used by anyone who has pending perfcounters patches - it converts
a Linux kernel tree over to the new naming. We tried to time this
change to the point in time where the amount of pending patches
is the smallest: the end of the merge window.

Namespace clashes were fixed up in a preparatory patch - and some
stylistic fallout will be fixed up in a subsequent patch.

( NOTE: 'counters' are still the proper terminology when we deal
  with hardware registers - and these sed scripts are a bit
  over-eager in renaming them. I've undone some of that, but
  in case there's something left where 'counter' would be
  better than 'event' we can undo that on an individual basis
  instead of touching an otherwise nicely automated patch. )

Suggested-by: Stephane Eranian <eranian@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <linux-arch@vger.kernel.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 files changed, 1249 insertions, 1249 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 3d9c7e27e3f..e26a546eac4 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -96,7 +96,7 @@ obj-$(CONFIG_X86_DS) += trace/
 obj-$(CONFIG_RING_BUFFER) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
 obj-$(CONFIG_SLOW_WORK) += slow-work.o
-obj-$(CONFIG_PERF_COUNTERS) += perf_counter.o
+obj-$(CONFIG_PERF_EVENTS) += perf_event.o
 
 ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/exit.c b/kernel/exit.c
index ae5d8660ddf..e47ee8a0613 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -47,7 +47,7 @@
 #include <linux/tracehook.h>
 #include <linux/fs_struct.h>
 #include <linux/init_task.h>
-#include <linux/perf_counter.h>
+#include <linux/perf_event.h>
 #include <trace/events/sched.h>
 
 #include <asm/uaccess.h>
@@ -154,8 +154,8 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
 {
 	struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
 
-#ifdef CONFIG_PERF_COUNTERS
-	WARN_ON_ONCE(tsk->perf_counter_ctxp);
+#ifdef CONFIG_PERF_EVENTS
+	WARN_ON_ONCE(tsk->perf_event_ctxp);
 #endif
 	trace_sched_process_free(tsk);
 	put_task_struct(tsk);
@@ -981,7 +981,7 @@ NORET_TYPE void do_exit(long code)
 	 * Flush inherited counters to the parent - before the parent
 	 * gets woken up by child-exit notifications.
 	 */
-	perf_counter_exit_task(tsk);
+	perf_event_exit_task(tsk);
 
 	exit_notify(tsk, group_dead);
 #ifdef CONFIG_NUMA
diff --git a/kernel/fork.c b/kernel/fork.c
index bfee931ee3f..2cebfb23b0b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -61,7 +61,7 @@
 #include <linux/blkdev.h>
 #include <linux/fs_struct.h>
 #include <linux/magic.h>
-#include <linux/perf_counter.h>
+#include <linux/perf_event.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -1078,7 +1078,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	/* Perform scheduler related setup. Assign this task to a CPU. */
 	sched_fork(p, clone_flags);
 
-	retval = perf_counter_init_task(p);
+	retval = perf_event_init_task(p);
 	if (retval)
 		goto bad_fork_cleanup_policy;
 
@@ -1253,7 +1253,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	write_unlock_irq(&tasklist_lock);
 	proc_fork_connector(p);
 	cgroup_post_fork(p);
-	perf_counter_fork(p);
+	perf_event_fork(p);
 	return p;
 
 bad_fork_free_pid:
@@ -1280,7 +1280,7 @@ bad_fork_cleanup_semundo:
 bad_fork_cleanup_audit:
 	audit_free(p);
 bad_fork_cleanup_policy:
-	perf_counter_free_task(p);
+	perf_event_free_task(p);
 #ifdef CONFIG_NUMA
 	mpol_put(p->mempolicy);
 bad_fork_cleanup_cgroup:
diff --git a/kernel/perf_counter.c b/kernel/perf_event.c
index 62de0db8092..6e8b99a04e1 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_event.c
@@ -1,5 +1,5 @@
 /*
- * Performance counter core code
+ * Performance event core code
  *
  *  Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
  *  Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
@@ -26,66 +26,66 @@
 #include <linux/syscalls.h>
 #include <linux/anon_inodes.h>
 #include <linux/kernel_stat.h>
-#include <linux/perf_counter.h>
+#include <linux/perf_event.h>
 
 #include <asm/irq_regs.h>
 
 /*
- * Each CPU has a list of per CPU counters:
+ * Each CPU has a list of per CPU events:
  */
 DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
 
-int perf_max_counters __read_mostly = 1;
+int perf_max_events __read_mostly = 1;
 static int perf_reserved_percpu __read_mostly;
 static int perf_overcommit __read_mostly = 1;
 
-static atomic_t nr_counters __read_mostly;
-static atomic_t nr_mmap_counters __read_mostly;
-static atomic_t nr_comm_counters __read_mostly;
-static atomic_t nr_task_counters __read_mostly;
+static atomic_t nr_events __read_mostly;
+static atomic_t nr_mmap_events __read_mostly;
+static atomic_t nr_comm_events __read_mostly;
+static atomic_t nr_task_events __read_mostly;
 
 /*
- * perf counter paranoia level:
+ * perf event paranoia level:
  *  -1 - not paranoid at all
  *   0 - disallow raw tracepoint access for unpriv
- *   1 - disallow cpu counters for unpriv
+ *   1 - disallow cpu events for unpriv
  *   2 - disallow kernel profiling for unpriv
  */
-int sysctl_perf_counter_paranoid __read_mostly = 1;
+int sysctl_perf_event_paranoid __read_mostly = 1;
 
 static inline bool perf_paranoid_tracepoint_raw(void)
 {
-	return sysctl_perf_counter_paranoid > -1;
+	return sysctl_perf_event_paranoid > -1;
 }
 
 static inline bool perf_paranoid_cpu(void)
 {
-	return sysctl_perf_counter_paranoid > 0;
+	return sysctl_perf_event_paranoid > 0;
 }
 
 static inline bool perf_paranoid_kernel(void)
 {
-	return sysctl_perf_counter_paranoid > 1;
+	return sysctl_perf_event_paranoid > 1;
 }
 
-int sysctl_perf_counter_mlock __read_mostly = 512; /* 'free' kb per user */
+int sysctl_perf_event_mlock __read_mostly = 512; /* 'free' kb per user */
 
 /*
- * max perf counter sample rate
+ * max perf event sample rate
  */
-int sysctl_perf_counter_sample_rate __read_mostly = 100000;
+int sysctl_perf_event_sample_rate __read_mostly = 100000;
 
-static atomic64_t perf_counter_id;
+static atomic64_t perf_event_id;
 
 /*
- * Lock for (sysadmin-configurable) counter reservations:
+ * Lock for (sysadmin-configurable) event reservations:
  */
 static DEFINE_SPINLOCK(perf_resource_lock);
 
 /*
  * Architecture provided APIs - weak aliases:
  */
-extern __weak const struct pmu *hw_perf_counter_init(struct perf_counter *counter)
+extern __weak const struct pmu *hw_perf_event_init(struct perf_event *event)
 {
 	return NULL;
 }
@@ -93,18 +93,18 @@ extern __weak const struct pmu *hw_perf_counter_init(struct perf_counter *counte
 void __weak hw_perf_disable(void)		{ barrier(); }
 void __weak hw_perf_enable(void)		{ barrier(); }
 
-void __weak hw_perf_counter_setup(int cpu)	{ barrier(); }
-void __weak hw_perf_counter_setup_online(int cpu)	{ barrier(); }
+void __weak hw_perf_event_setup(int cpu)	{ barrier(); }
+void __weak hw_perf_event_setup_online(int cpu)	{ barrier(); }
 
 int __weak
-hw_perf_group_sched_in(struct perf_counter *group_leader,
+hw_perf_group_sched_in(struct perf_event *group_leader,
 	       struct perf_cpu_context *cpuctx,
-	       struct perf_counter_context *ctx, int cpu)
+	       struct perf_event_context *ctx, int cpu)
 {
 	return 0;
 }
 
-void __weak perf_counter_print_debug(void)	{ }
+void __weak perf_event_print_debug(void)	{ }
 
 static DEFINE_PER_CPU(int, perf_disable_count);
 
@@ -130,20 +130,20 @@ void perf_enable(void)
 		hw_perf_enable();
 }
 
-static void get_ctx(struct perf_counter_context *ctx)
+static void get_ctx(struct perf_event_context *ctx)
 {
 	WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
 }
 
 static void free_ctx(struct rcu_head *head)
 {
-	struct perf_counter_context *ctx;
+	struct perf_event_context *ctx;
 
-	ctx = container_of(head, struct perf_counter_context, rcu_head);
+	ctx = container_of(head, struct perf_event_context, rcu_head);
 	kfree(ctx);
 }
 
-static void put_ctx(struct perf_counter_context *ctx)
+static void put_ctx(struct perf_event_context *ctx)
 {
 	if (atomic_dec_and_test(&ctx->refcount)) {
 		if (ctx->parent_ctx)
@@ -154,7 +154,7 @@ static void put_ctx(struct perf_counter_context *ctx)
 	}
 }
 
-static void unclone_ctx(struct perf_counter_context *ctx)
+static void unclone_ctx(struct perf_event_context *ctx)
 {
 	if (ctx->parent_ctx) {
 		put_ctx(ctx->parent_ctx);
@@ -163,37 +163,37 @@ static void unclone_ctx(struct perf_counter_context *ctx)
 }
 
 /*
- * If we inherit counters we want to return the parent counter id
+ * If we inherit events we want to return the parent event id
  * to userspace.
  */
-static u64 primary_counter_id(struct perf_counter *counter)
+static u64 primary_event_id(struct perf_event *event)
 {
-	u64 id = counter->id;
+	u64 id = event->id;
 
-	if (counter->parent)
-		id = counter->parent->id;
+	if (event->parent)
+		id = event->parent->id;
 
 	return id;
 }
 
 /*
- * Get the perf_counter_context for a task and lock it.
+ * Get the perf_event_context for a task and lock it.
  * This has to cope with with the fact that until it is locked,
  * the context could get moved to another task.
  */
-static struct perf_counter_context *
+static struct perf_event_context *
 perf_lock_task_context(struct task_struct *task, unsigned long *flags)
 {
-	struct perf_counter_context *ctx;
+	struct perf_event_context *ctx;
 
 	rcu_read_lock();
  retry:
-	ctx = rcu_dereference(task->perf_counter_ctxp);
+	ctx = rcu_dereference(task->perf_event_ctxp);
 	if (ctx) {
 		/*
 		 * If this context is a clone of another, it might
 		 * get swapped for another underneath us by
-		 * perf_counter_task_sched_out, though the
+		 * perf_event_task_sched_out, though the
 		 * rcu_read_lock() protects us from any context
 		 * getting freed.  Lock the context and check if it
 		 * got swapped before we could get the lock, and retry
@@ -201,7 +201,7 @@ perf_lock_task_context(struct task_struct *task, unsigned long *flags)
 		 * can't get swapped on us any more.
 		 */
 		spin_lock_irqsave(&ctx->lock, *flags);
-		if (ctx != rcu_dereference(task->perf_counter_ctxp)) {
+		if (ctx != rcu_dereference(task->perf_event_ctxp)) {
 			spin_unlock_irqrestore(&ctx->lock, *flags);
 			goto retry;
 		}
@@ -220,9 +220,9 @@ perf_lock_task_context(struct task_struct *task, unsigned long *flags)
  * can't get swapped to another task.  This also increments its
  * reference count so that the context can't get freed.
  */
-static struct perf_counter_context *perf_pin_task_context(struct task_struct *task)
+static struct perf_event_context *perf_pin_task_context(struct task_struct *task)
 {
-	struct perf_counter_context *ctx;
+	struct perf_event_context *ctx;
 	unsigned long flags;
 
 	ctx = perf_lock_task_context(task, &flags);
@@ -233,7 +233,7 @@ static struct perf_counter_context *perf_pin_task_context(struct task_struct *ta
 	return ctx;
 }
 
-static void perf_unpin_context(struct perf_counter_context *ctx)
+static void perf_unpin_context(struct perf_event_context *ctx)
 {
 	unsigned long flags;
 
@@ -244,59 +244,59 @@ static void perf_unpin_context(struct perf_counter_context *ctx)
 }
 
 /*
- * Add a counter from the lists for its context.
+ * Add a event from the lists for its context.
  * Must be called with ctx->mutex and ctx->lock held.
  */
 static void
-list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
+list_add_event(struct perf_event *event, struct perf_event_context *ctx)
 {
-	struct perf_counter *group_leader = counter->group_leader;
+	struct perf_event *group_leader = event->group_leader;
 
 	/*
-	 * Depending on whether it is a standalone or sibling counter,
-	 * add it straight to the context's counter list, or to the group
+	 * Depending on whether it is a standalone or sibling event,
+	 * add it straight to the context's event list, or to the group
 	 * leader's sibling list:
 	 */
-	if (group_leader == counter)
-		list_add_tail(&counter->group_entry, &ctx->group_list);
+	if (group_leader == event)
+		list_add_tail(&event->group_entry, &ctx->group_list);
 	else {
-		list_add_tail(&counter->group_entry, &group_leader->sibling_list);
+		list_add_tail(&event->group_entry, &group_leader->sibling_list);
 		group_leader->nr_siblings++;
 	}
 
-	list_add_rcu(&counter->event_entry, &ctx->event_list);
-	ctx->nr_counters++;
-	if (counter->attr.inherit_stat)
+	list_add_rcu(&event->event_entry, &ctx->event_list);
+	ctx->nr_events++;
+	if (event->attr.inherit_stat)
 		ctx->nr_stat++;
 }
 
 /*
- * Remove a counter from the lists for its context.
+ * Remove a event from the lists for its context.
  * Must be called with ctx->mutex and ctx->lock held.
  */
 static void
-list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
+list_del_event(struct perf_event *event, struct perf_event_context *ctx)
 {
-	struct perf_counter *sibling, *tmp;
+	struct perf_event *sibling, *tmp;
 
-	if (list_empty(&counter->group_entry))
+	if (list_empty(&event->group_entry))
 		return;
-	ctx->nr_counters--;
-	if (counter->attr.inherit_stat)
+	ctx->nr_events--;
+	if (event->attr.inherit_stat)
 		ctx->nr_stat--;
 
-	list_del_init(&counter->group_entry);
-	list_del_rcu(&counter->event_entry);
+	list_del_init(&event->group_entry);
+	list_del_rcu(&event->event_entry);
 
-	if (counter->group_leader != counter)
-		counter->group_leader->nr_siblings--;
+	if (event->group_leader != event)
+		event->group_leader->nr_siblings--;
 
 	/*
-	 * If this was a group counter with sibling counters then
-	 * upgrade the siblings to singleton counters by adding them
+	 * If this was a group event with sibling events then
+	 * upgrade the siblings to singleton events by adding them
 	 * to the context list directly:
 	 */
-	list_for_each_entry_safe(sibling, tmp, &counter->sibling_list, group_entry) {
+	list_for_each_entry_safe(sibling, tmp, &event->sibling_list, group_entry) {
 
 		list_move_tail(&sibling->group_entry, &ctx->group_list);
 		sibling->group_leader = sibling;
@@ -304,62 +304,62 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
 }
 
 static void
-counter_sched_out(struct perf_counter *counter,
+event_sched_out(struct perf_event *event,
 		  struct perf_cpu_context *cpuctx,
-		  struct perf_counter_context *ctx)
+		  struct perf_event_context *ctx)
 {
-	if (counter->state != PERF_COUNTER_STATE_ACTIVE)
+	if (event->state != PERF_EVENT_STATE_ACTIVE)
 		return;
 
-	counter->state = PERF_COUNTER_STATE_INACTIVE;
-	if (counter->pending_disable) {
-		counter->pending_disable = 0;
-		counter->state = PERF_COUNTER_STATE_OFF;
+	event->state = PERF_EVENT_STATE_INACTIVE;
+	if (event->pending_disable) {
+		event->pending_disable = 0;
+		event->state = PERF_EVENT_STATE_OFF;
 	}
-	counter->tstamp_stopped = ctx->time;
-	counter->pmu->disable(counter);
-	counter->oncpu = -1;
+	event->tstamp_stopped = ctx->time;
+	event->pmu->disable(event);
+	event->oncpu = -1;
 
-	if (!is_software_counter(counter))
+	if (!is_software_event(event))
 		cpuctx->active_oncpu--;
 	ctx->nr_active--;
-	if (counter->attr.exclusive || !cpuctx->active_oncpu)
+	if (event->attr.exclusive || !cpuctx->active_oncpu)
 		cpuctx->exclusive = 0;
 }
 
 static void
-group_sched_out(struct perf_counter *group_counter,
+group_sched_out(struct perf_event *group_event,
 		struct perf_cpu_context *cpuctx,
-		struct perf_counter_context *ctx)
+		struct perf_event_context *ctx)
 {
-	struct perf_counter *counter;
+	struct perf_event *event;
 
-	if (group_counter->state != PERF_COUNTER_STATE_ACTIVE)
+	if (group_event->state != PERF_EVENT_STATE_ACTIVE)
 		return;
 
-	counter_sched_out(group_counter, cpuctx, ctx);
+	event_sched_out(group_event, cpuctx, ctx);
 
 	/*
 	 * Schedule out siblings (if any):
 	 */
-	list_for_each_entry(counter, &group_counter->sibling_list, group_entry)
-		counter_sched_out(counter, cpuctx, ctx);
+	list_for_each_entry(event, &group_event->sibling_list, group_entry)
+		event_sched_out(event, cpuctx, ctx);
 
-	if (group_counter->attr.exclusive)
+	if (group_event->attr.exclusive)
 		cpuctx->exclusive = 0;
 }
 
 /*
- * Cross CPU call to remove a performance counter
+ * Cross CPU call to remove a performance event
  *
- * We disable the counter on the hardware level first. After that we
+ * We disable the event on the hardware level first. After that we
  * remove it from the context list.
  */
-static void __perf_counter_remove_from_context(void *info)
+static void __perf_event_remove_from_context(void *info)
 {
 	struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
-	struct perf_counter *counter = info;
-	struct perf_counter_context *ctx = counter->ctx;
+	struct perf_event *event = info;
+	struct perf_event_context *ctx = event->ctx;
 
 	/*
 	 * If this is a task context, we need to check whether it is
@@ -372,22 +372,22 @@ static void __perf_counter_remove_from_context(void *info)
 	spin_lock(&ctx->lock);
 	/*
 	 * Protect the list operation against NMI by disabling the
-	 * counters on a global level.
+	 * events on a global level.
 	 */
 	perf_disable();
 
-	counter_sched_out(counter, cpuctx, ctx);
+	event_sched_out(event, cpuctx, ctx);
 
-	list_del_counter(counter, ctx);
+	list_del_event(event, ctx);
 
 	if (!ctx->task) {
 		/*
-		 * Allow more per task counters with respect to the
+		 * Allow more per task events with respect to the
 		 * reservation:
 		 */
 		cpuctx->max_pertask =
-			min(perf_max_counters - ctx->nr_counters,
-			    perf_max_counters - perf_reserved_percpu);
+			min(perf_max_events - ctx->nr_events,
+			    perf_max_events - perf_reserved_percpu);
 	}
 
 	perf_enable();
@@ -396,56 +396,56 @@ static void __perf_counter_remove_from_context(void *info)
 
 
 /*
- * Remove the counter from a task's (or a CPU's) list of counters.
+ * Remove the event from a task's (or a CPU's) list of events.
  *
  * Must be called with ctx->mutex held.
  *
- * CPU counters are removed with a smp call. For task counters we only
+ * CPU events are removed with a smp call. For task events we only
  * call when the task is on a CPU.
  *
- * If counter->ctx is a cloned context, callers must make sure that
- * every task struct that counter->ctx->task could possibly point to
+ * If event->ctx is a cloned context, callers must make sure that
+ * every task struct that event->ctx->task could possibly point to
  * remains valid.  This is OK when called from perf_release since
  * that only calls us on the top-level context, which can't be a clone.
- * When called from perf_counter_exit_task, it's OK because the
+ * When called from perf_event_exit_task, it's OK because the
  * context has been detached from its task.
  */
-static void perf_counter_remove_from_context(struct perf_counter *counter)
+static void perf_event_remove_from_context(struct perf_event *event)
 {
-	struct perf_counter_context *ctx = counter->ctx;
+	struct perf_event_context *ctx = event->ctx;
 	struct task_struct *task = ctx->task;
 
 	if (!task) {
 		/*
-		 * Per cpu counters are removed via an smp call and
+		 * Per cpu events are removed via an smp call and
 		 * the removal is always sucessful.
 		 */
-		smp_call_function_single(counter->cpu,
-					 __perf_counter_remove_from_context,
-					 counter, 1);
+		smp_call_function_single(event->cpu,
+					 __perf_event_remove_from_context,
+					 event, 1);
 		return;
 	}
 
 retry:
-	task_oncpu_function_call(task, __perf_counter_remove_from_context,
-				 counter);
+	task_oncpu_function_call(task, __perf_event_remove_from_context,
+				 event);
 
 	spin_lock_irq(&ctx->lock);
 	/*
 	 * If the context is active we need to retry the smp call.
 	 */
-	if (ctx->nr_active && !list_empty(&counter->group_entry)) {
+	if (ctx->nr_active && !list_empty(&event->group_entry)) {
 		spin_unlock_irq(&ctx->lock);
 		goto retry;
 	}
 
 	/*
 	 * The lock prevents that this context is scheduled in so we
-	 * can remove the counter safely, if the call above did not
+	 * can remove the event safely, if the call above did not
 	 * succeed.
 	 */
-	if (!list_empty(&counter->group_entry)) {
-		list_del_counter(counter, ctx);
+	if (!list_empty(&event->group_entry)) {
+		list_del_event(event, ctx);
 	}
 	spin_unlock_irq(&ctx->lock);
 }
@@ -458,7 +458,7 @@ static inline u64 perf_clock(void)
 /*
  * Update the record of the current time in a context.
  */
-static void update_context_time(struct perf_counter_context *ctx)
+static void update_context_time(struct perf_event_context *ctx)
 {
 	u64 now = perf_clock();
 
@@ -467,51 +467,51 @@ static void update_context_time(struct perf_counter_context *ctx)
 }
 
 /*
- * Update the total_time_enabled and total_time_running fields for a counter.
+ * Update the total_time_enabled and total_time_running fields for a event.
  */
-static void update_counter_times(struct perf_counter *counter)
+static void update_event_times(struct perf_event *event)
 {
-	struct perf_counter_context *ctx = counter->ctx;
+	struct perf_event_context *ctx = event->ctx;
 	u64 run_end;
 
-	if (counter->state < PERF_COUNTER_STATE_INACTIVE ||
-	    counter->group_leader->state < PERF_COUNTER_STATE_INACTIVE)
+	if (event->state < PERF_EVENT_STATE_INACTIVE ||
+	    event->group_leader->state < PERF_EVENT_STATE_INACTIVE)
 		return;
 
-	counter->total_time_enabled = ctx->time - counter->tstamp_enabled;
+	event->total_time_enabled = ctx->time - event->tstamp_enabled;
 
-	if (counter->state == PERF_COUNTER_STATE_INACTIVE)
-		run_end = counter->tstamp_stopped;
+	if (event->state == PERF_EVENT_STATE_INACTIVE)
+		run_end = event->tstamp_stopped;
 	else
 		run_end = ctx->time;
 
-	counter->total_time_running = run_end - counter->tstamp_running;
+	event->total_time_running = run_end - event->tstamp_running;
 }
 
 /*
- * Update total_time_enabled and total_time_running for all counters in a group.
+ * Update total_time_enabled and total_time_running for all events in a group.
  */
-static void update_group_times(struct perf_counter *leader)
+static void update_group_times(struct perf_event *leader)
 {
-	struct perf_counter *counter;
+	struct perf_event *event;
 
-	update_counter_times(leader);
-	list_for_each_entry(counter, &leader->sibling_list, group_entry)
-		update_counter_times(counter);
+	update_event_times(leader);
+	list_for_each_entry(event, &leader->sibling_list, group_entry)
+		update_event_times(event);
 }
 
 /*
- * Cross CPU call to disable a performance counter
+ * Cross CPU call to disable a performance event
  */
-static void __perf_counter_disable(void *info)
+static void __perf_event_disable(void *info)
 {
-	struct perf_counter *counter = info;
+	struct perf_event *event = info;
 	struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
-	struct perf_counter_context *ctx = counter->ctx;
+	struct perf_event_context *ctx = event->ctx;
 
 	/*
-	 * If this is a per-task counter, need to check whether this
-	 * counter's task is the current task on this cpu.
+	 * If this is a per-task event, need to check whether this
+	 * event's task is the current task on this cpu.
 	 */
 	if (ctx->task && cpuctx->task_ctx != ctx)
 		return;
@@ -519,57 +519,57 @@ static void __perf_counter_disable(void *info)
 	spin_lock(&ctx->lock);
 
 	/*
-	 * If the counter is on, turn it off.
+	 * If the event is on, turn it off.
 	 * If it is in error state, leave it in error state.
 	 */
-	if (counter->state >= PERF_COUNTER_STATE_INACTIVE) {
+	if (event->state >= PERF_EVENT_STATE_INACTIVE) {
 		update_context_time(ctx);
-		update_group_times(counter);
-		if (counter == counter->group_leader)
-			group_sched_out(counter, cpuctx, ctx);
+		update_group_times(event);
+		if (event == event->group_leader)
+			group_sched_out(event, cpuctx, ctx);
 		else
-			counter_sched_out(counter, cpuctx, ctx);
-		counter->state = PERF_COUNTER_STATE_OFF;
+			event_sched_out(event, cpuctx, ctx);
+		event->state = PERF_EVENT_STATE_OFF;
 	}
 
 	spin_unlock(&ctx->lock);
 }
 
 /*
- * Disable a counter.
+ * Disable a event.
  *
- * If counter->ctx is a cloned context, callers must make sure that
- * every task struct that counter->ctx->task could possibly point to
+ * If event->ctx is a cloned context, callers must make sure that
+ * every task struct that event->ctx->task could possibly point to
  * remains valid.  This condition is satisifed when called through
- * perf_counter_for_each_child or perf_counter_for_each because they
- * hold the top-level counter's child_mutex, so any descendant that
- * goes to exit will block in sync_child_counter.
- * When called from perf_pending_counter it's OK because counter->ctx
+ * perf_event_for_each_child or perf_event_for_each because they
+ * hold the top-level event's child_mutex, so any descendant that
+ * goes to exit will block in sync_child_event.
+ * When called from perf_pending_event it's OK because event->ctx
  * is the current context on this CPU and preemption is disabled,
- * hence we can't get into perf_counter_task_sched_out for this context.
+ * hence we can't get into perf_event_task_sched_out for this context.
  */
-static void perf_counter_disable(struct perf_counter *counter)
+static void perf_event_disable(struct perf_event *event)
 {
-	struct perf_counter_context *ctx = counter->ctx;
+	struct perf_event_context *ctx = event->ctx;
 	struct task_struct *task = ctx->task;
 
 	if (!task) {
 		/*
-		 * Disable the counter on the cpu that it's on
+		 * Disable the event on the cpu that it's on
 		 */
-		smp_call_function_single(counter->cpu, __perf_counter_disable,
-					 counter, 1);
+		smp_call_function_single(event->cpu, __perf_event_disable,
+					 event, 1);
 		return;
 	}
 
  retry:
-	task_oncpu_function_call(task, __perf_counter_disable, counter);
+	task_oncpu_function_call(task, __perf_event_disable, event);
 
 	spin_lock_irq(&ctx->lock);
 	/*
-	 * If the counter is still active, we need to retry the cross-call.
+	 * If the event is still active, we need to retry the cross-call.
 	 */
-	if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
+	if (event->state == PERF_EVENT_STATE_ACTIVE) {
 		spin_unlock_irq(&ctx->lock);
 		goto retry;
 	}
@@ -578,73 +578,73 @@ static void perf_counter_disable(struct perf_counter *counter)
 	 * Since we have the lock this context can't be scheduled
 	 * in, so we can change the state safely.
 	 */
-	if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
-		update_group_times(counter);
-		counter->state = PERF_COUNTER_STATE_OFF;
+	if (event->state == PERF_EVENT_STATE_INACTIVE) {
+		update_group_times(event);
+		event->state = PERF_EVENT_STATE_OFF;
 	}
 
 	spin_unlock_irq(&ctx->lock);
 }
 
 static int
-counter_sched_in(struct perf_counter *counter,
+event_sched_in(struct perf_event *event,
 		 struct perf_cpu_context *cpuctx,
-		 struct perf_counter_context *ctx,
+		 struct perf_event_context *ctx,
 		 int cpu)
 {
-	if (counter->state <= PERF_COUNTER_STATE_OFF)
+	if (event->state <= PERF_EVENT_STATE_OFF)
 		return 0;
 
-	counter->state = PERF_COUNTER_STATE_ACTIVE;
-	counter->oncpu = cpu;	/* TODO: put 'cpu' into cpuctx->cpu */
+	event->state = PERF_EVENT_STATE_ACTIVE;
+	event->oncpu = cpu;	/* TODO: put 'cpu' into cpuctx->cpu */
 	/*
 	 * The new state must be visible before we turn it on in the hardware:
 	 */
 	smp_wmb();
 
-	if (counter->pmu->enable(counter)) {
-		counter->state = PERF_COUNTER_STATE_INACTIVE;
-		counter->oncpu = -1;
+	if (event->pmu->enable(event)) {
+		event->state = PERF_EVENT_STATE_INACTIVE;
+		event->oncpu = -1;
 		return -EAGAIN;
 	}
 
-	counter->tstamp_running += ctx->time - counter->tstamp_stopped;
+	event->tstamp_running += ctx->time - event->tstamp_stopped;
 
-	if (!is_software_counter(counter))
+	if (!is_software_event(event))
 		cpuctx->active_oncpu++;
 	ctx->nr_active++;
 
-	if (counter->attr.exclusive)
+	if (event->attr.exclusive)
 		cpuctx->exclusive = 1;
 
 	return 0;
 }
 
 static int
-group_sched_in(struct perf_counter *group_counter,
+group_sched_in(struct perf_event *group_event,
 	       struct perf_cpu_context *cpuctx,
-	       struct perf_counter_context *ctx,
+	       struct perf_event_context *ctx,
 	       int cpu)
 {
-	struct perf_counter *counter, *partial_group;
+	struct perf_event *event, *partial_group;
 	int ret;
 
-	if (group_counter->state == PERF_COUNTER_STATE_OFF)
+	if (group_event->state == PERF_EVENT_STATE_OFF)
 		return 0;
 
-	ret = hw_perf_group_sched_in(group_counter, cpuctx, ctx, cpu);
+	ret = hw_perf_group_sched_in(group_event, cpuctx, ctx, cpu);
 	if (ret)
 		return ret < 0 ? ret : 0;
 
-	if (counter_sched_in(group_counter, cpuctx, ctx, cpu))
+	if (event_sched_in(group_event, cpuctx, ctx, cpu))
 		return -EAGAIN;
 
 	/*
 	 * Schedule in siblings as one group (if any):
 	 */
-	list_for_each_entry(counter, &group_counter->sibling_list, group_entry) {
-		if (counter_sched_in(counter, cpuctx, ctx, cpu)) {
-			partial_group = counter;
+	list_for_each_entry(event, &group_event->sibling_list, group_entry) {
+		if (event_sched_in(event, cpuctx, ctx, cpu)) {
+			partial_group = event;
 			goto group_error;
 		}
 	}
@@ -656,57 +656,57 @@ group_error:
 	 * Groups can be scheduled in as one unit only, so undo any
 	 * partial group before returning:
 	 */
-	list_for_each_entry(counter, &group_counter->sibling_list, group_entry) {
-		if (counter == partial_group)
+	list_for_each_entry(event, &group_event->sibling_list, group_entry) {
+		if (event == partial_group)
 			break;
-		counter_sched_out(counter, cpuctx, ctx);
+		event_sched_out(event, cpuctx, ctx);
 	}
-	counter_sched_out(group_counter, cpuctx, ctx);
+	event_sched_out(group_event, cpuctx, ctx);
 
 	return -EAGAIN;
 }
 
 /*
- * Return 1 for a group consisting entirely of software counters,
- * 0 if the group contains any hardware counters.
+ * Return 1 for a group consisting entirely of software events,
+ * 0 if the group contains any hardware events.
  */
-static int is_software_only_group(struct perf_counter *leader)
+static int is_software_only_group(struct perf_event *leader)
 {
-	struct perf_counter *counter;
+	struct perf_event *event;
 
-	if (!is_software_counter(leader))
+	if (!is_software_event(leader))
 		return 0;
 
-	list_for_each_entry(counter, &leader->sibling_list, group_entry)
-		if (!is_software_counter(counter))
+	list_for_each_entry(event, &leader->sibling_list, group_entry)
+		if (!is_software_event(event))
 			return 0;
 
 	return 1;
 }
 
 /*
- * Work out whether we can put this counter group on the CPU now.
+ * Work out whether we can put this event group on the CPU now.
  */
-static int group_can_go_on(struct perf_counter *counter,
+static int group_can_go_on(struct perf_event *event,
 			   struct perf_cpu_context *cpuctx,
 			   int can_add_hw)
 {
 	/*
-	 * Groups consisting entirely of software counters can always go on.
+	 * Groups consisting entirely of software events can always go on.
 	 */
-	if (is_software_only_group(counter))
+	if (is_software_only_group(event))
 		return 1;
 	/*
 	 * If an exclusive group is already on, no other hardware
-	 * counters can go on.
+	 * events can go on.
 	 */
 	if (cpuctx->exclusive)
 		return 0;
 	/*
 	 * If this group is exclusive and there are already
-	 * counters on the CPU, it can