perf_counter: Rename list_entry -> group_entry, counter_list -> group_list

This is in preparation of the big rename, but also makes sense
in a standalone way: 'list_entry' is a bad name as we already
have a list_entry() in list.h.

Also, the 'counter list' is too vague, it doesnt tell us the
purpose of that list.

Clarify these names to show that it's all about the group
hiearchy.

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 37 insertions, 38 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 740caad09a44..f64862732673 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -543,7 +543,7 @@ struct perf_pending_entry {
  */
 struct perf_counter {
 #ifdef CONFIG_PERF_COUNTERS
-        struct list_head                list_entry;
+        struct list_head                group_entry;
         struct list_head                event_entry;
         struct list_head                sibling_list;
         int                             nr_siblings;
@@ -649,7 +649,7 @@ struct perf_counter_context {
          */
         struct mutex                    mutex;
 
-        struct list_head                counter_list;
+        struct list_head                group_list;
         struct list_head                event_list;
         int                             nr_counters;
         int                             nr_active;
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index cc768ab81ac8..13ad73aed4ca 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -258,9 +258,9 @@ list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
          * leader's sibling list:
          */
         if (group_leader == counter)
-                list_add_tail(&counter->list_entry, &ctx->counter_list);
+                list_add_tail(&counter->group_entry, &ctx->group_list);
         else {
-                list_add_tail(&counter->list_entry, &group_leader->sibling_list);
+                list_add_tail(&counter->group_entry, &group_leader->sibling_list);
                 group_leader->nr_siblings++;
         }
 
@@ -279,13 +279,13 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
 {
         struct perf_counter *sibling, *tmp;
 
-        if (list_empty(&counter->list_entry))
+        if (list_empty(&counter->group_entry))
                 return;
         ctx->nr_counters--;
         if (counter->attr.inherit_stat)
                 ctx->nr_stat--;
 
-        list_del_init(&counter->list_entry);
+        list_del_init(&counter->group_entry);
         list_del_rcu(&counter->event_entry);
 
         if (counter->group_leader != counter)
@@ -296,10 +296,9 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
          * upgrade the siblings to singleton counters by adding them
          * to the context list directly:
          */
-        list_for_each_entry_safe(sibling, tmp,
-                                 &counter->sibling_list, list_entry) {
+        list_for_each_entry_safe(sibling, tmp, &counter->sibling_list, group_entry) {
 
-                list_move_tail(&sibling->list_entry, &ctx->counter_list);
+                list_move_tail(&sibling->group_entry, &ctx->group_list);
                 sibling->group_leader = sibling;
         }
 }
@@ -343,7 +342,7 @@ group_sched_out(struct perf_counter *group_counter,
         /*
          * Schedule out siblings (if any):
          */
-        list_for_each_entry(counter, &group_counter->sibling_list, list_entry)
+        list_for_each_entry(counter, &group_counter->sibling_list, group_entry)
                 counter_sched_out(counter, cpuctx, ctx);
 
         if (group_counter->attr.exclusive)
@@ -435,7 +434,7 @@ retry:
         /*
          * If the context is active we need to retry the smp call.
          */
-        if (ctx->nr_active && !list_empty(&counter->list_entry)) {
+        if (ctx->nr_active && !list_empty(&counter->group_entry)) {
                 spin_unlock_irq(&ctx->lock);
                 goto retry;
         }
@@ -445,7 +444,7 @@ retry:
          * can remove the counter safely, if the call above did not
          * succeed.
          */
-        if (!list_empty(&counter->list_entry)) {
+        if (!list_empty(&counter->group_entry)) {
                 list_del_counter(counter, ctx);
         }
         spin_unlock_irq(&ctx->lock);
@@ -497,7 +496,7 @@ static void update_group_times(struct perf_counter *leader)
         struct perf_counter *counter;
 
         update_counter_times(leader);
-        list_for_each_entry(counter, &leader->sibling_list, list_entry)
+        list_for_each_entry(counter, &leader->sibling_list, group_entry)
                 update_counter_times(counter);
 }
 
@@ -643,7 +642,7 @@ group_sched_in(struct perf_counter *group_counter,
         /*
          * Schedule in siblings as one group (if any):
          */
-        list_for_each_entry(counter, &group_counter->sibling_list, list_entry) {
+        list_for_each_entry(counter, &group_counter->sibling_list, group_entry) {
                 if (counter_sched_in(counter, cpuctx, ctx, cpu)) {
                         partial_group = counter;
                         goto group_error;
@@ -657,7 +656,7 @@ 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, list_entry) {
+        list_for_each_entry(counter, &group_counter->sibling_list, group_entry) {
                 if (counter == partial_group)
                         break;
                 counter_sched_out(counter, cpuctx, ctx);
@@ -678,7 +677,7 @@ static int is_software_only_group(struct perf_counter *leader)
         if (!is_software_counter(leader))
                 return 0;
 
-        list_for_each_entry(counter, &leader->sibling_list, list_entry)
+        list_for_each_entry(counter, &leader->sibling_list, group_entry)
                 if (!is_software_counter(counter))
                         return 0;
 
@@ -842,7 +841,7 @@ retry:
         /*
          * we need to retry the smp call.
          */
-        if (ctx->is_active && list_empty(&counter->list_entry)) {
+        if (ctx->is_active && list_empty(&counter->group_entry)) {
                 spin_unlock_irq(&ctx->lock);
                 goto retry;
         }
@@ -852,7 +851,7 @@ retry:
          * can add the counter safely, if it the call above did not
          * succeed.
          */
-        if (list_empty(&counter->list_entry))
+        if (list_empty(&counter->group_entry))
                 add_counter_to_ctx(counter, ctx);
         spin_unlock_irq(&ctx->lock);
 }
@@ -872,7 +871,7 @@ static void __perf_counter_mark_enabled(struct perf_counter *counter,
 
         counter->state = PERF_COUNTER_STATE_INACTIVE;
         counter->tstamp_enabled = ctx->time - counter->total_time_enabled;
-        list_for_each_entry(sub, &counter->sibling_list, list_entry)
+        list_for_each_entry(sub, &counter->sibling_list, group_entry)
                 if (sub->state >= PERF_COUNTER_STATE_INACTIVE)
                         sub->tstamp_enabled =
                                 ctx->time - sub->total_time_enabled;
@@ -1032,7 +1031,7 @@ void __perf_counter_sched_out(struct perf_counter_context *ctx,
 
         perf_disable();
         if (ctx->nr_active) {
-                list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+                list_for_each_entry(counter, &ctx->group_list, group_entry) {
                         if (counter != counter->group_leader)
                                 counter_sched_out(counter, cpuctx, ctx);
                         else
@@ -1252,7 +1251,7 @@ __perf_counter_sched_in(struct perf_counter_context *ctx,
          * First go through the list and put on any pinned groups
          * in order to give them the best chance of going on.
          */
-        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+        list_for_each_entry(counter, &ctx->group_list, group_entry) {
                 if (counter->state <= PERF_COUNTER_STATE_OFF ||
                     !counter->attr.pinned)
                         continue;
@@ -1276,7 +1275,7 @@ __perf_counter_sched_in(struct perf_counter_context *ctx,
                 }
         }
 
-        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+        list_for_each_entry(counter, &ctx->group_list, group_entry) {
                 /*
                  * Ignore counters in OFF or ERROR state, and
                  * ignore pinned counters since we did them already.
@@ -1369,7 +1368,7 @@ static void perf_ctx_adjust_freq(struct perf_counter_context *ctx)
         u64 interrupts, freq;
 
         spin_lock(&ctx->lock);
-        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+        list_for_each_entry(counter, &ctx->group_list, group_entry) {
                 if (counter->state != PERF_COUNTER_STATE_ACTIVE)
                         continue;
 
@@ -1441,8 +1440,8 @@ static void rotate_ctx(struct perf_counter_context *ctx)
          * Rotate the first entry last (works just fine for group counters too):
          */
         perf_disable();
-        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
-                list_move_tail(&counter->list_entry, &ctx->counter_list);
+        list_for_each_entry(counter, &ctx->group_list, group_entry) {
+                list_move_tail(&counter->group_entry, &ctx->group_list);
                 break;
         }
         perf_enable();
@@ -1498,7 +1497,7 @@ static void perf_counter_enable_on_exec(struct task_struct *task)
 
         spin_lock(&ctx->lock);
 
-        list_for_each_entry(counter, &ctx->counter_list, list_entry) {
+        list_for_each_entry(counter, &ctx->group_list, group_entry) {
                 if (!counter->attr.enable_on_exec)
                         continue;
                 counter->attr.enable_on_exec = 0;
@@ -1575,7 +1574,7 @@ __perf_counter_init_context(struct perf_counter_context *ctx,
         memset(ctx, 0, sizeof(*ctx));
         spin_lock_init(&ctx->lock);
         mutex_init(&ctx->mutex);
-        INIT_LIST_HEAD(&ctx->counter_list);
+        INIT_LIST_HEAD(&ctx->group_list);
         INIT_LIST_HEAD(&ctx->event_list);
         atomic_set(&ctx->refcount, 1);
         ctx->task = task;
@@ -1818,7 +1817,7 @@ static int perf_counter_read_group(struct perf_counter *counter,
 
         size += err;
 
-        list_for_each_entry(sub, &leader->sibling_list, list_entry) {
+        list_for_each_entry(sub, &leader->sibling_list, group_entry) {
                 err = perf_counter_read_entry(sub, read_format,
                                 buf + size);
                 if (err < 0)
@@ -1948,7 +1947,7 @@ static void perf_counter_for_each(struct perf_counter *counter,
 
         perf_counter_for_each_child(counter, func);
         func(counter);
-        list_for_each_entry(sibling, &counter->sibling_list, list_entry)
+        list_for_each_entry(sibling, &counter->sibling_list, group_entry)
                 perf_counter_for_each_child(counter, func);
         mutex_unlock(&ctx->mutex);
 }
@@ -2832,7 +2831,7 @@ static void perf_output_read_group(struct perf_output_handle *handle,
 
         perf_output_copy(handle, values, n * sizeof(u64));
 
-        list_for_each_entry(sub, &leader->sibling_list, list_entry) {
+        list_for_each_entry(sub, &leader->sibling_list, group_entry) {
                 n = 0;
 
                 if (sub != counter)
@@ -4118,7 +4117,7 @@ perf_counter_alloc(struct perf_counter_attr *attr,
         mutex_init(&counter->child_mutex);
         INIT_LIST_HEAD(&counter->child_list);
 
-        INIT_LIST_HEAD(&counter->list_entry);
+        INIT_LIST_HEAD(&counter->group_entry);
         INIT_LIST_HEAD(&counter->event_entry);
         INIT_LIST_HEAD(&counter->sibling_list);
         init_waitqueue_head(&counter->waitq);
@@ -4544,7 +4543,7 @@ static int inherit_group(struct perf_counter *parent_counter,
                                  child, NULL, child_ctx);
         if (IS_ERR(leader))
                 return PTR_ERR(leader);
-        list_for_each_entry(sub, &parent_counter->sibling_list, list_entry) {
+        list_for_each_entry(sub, &parent_counter->sibling_list, group_entry) {
                 child_ctr = inherit_counter(sub, parent, parent_ctx,
                                             child, leader, child_ctx);
                 if (IS_ERR(child_ctr))
@@ -4670,8 +4669,8 @@ void perf_counter_exit_task(struct task_struct *child)
         mutex_lock_nested(&child_ctx->mutex, SINGLE_DEPTH_NESTING);
 
 again:
-        list_for_each_entry_safe(child_counter, tmp, &child_ctx->counter_list,
-                                 list_entry)
+        list_for_each_entry_safe(child_counter, tmp, &child_ctx->group_list,
+                                 group_entry)
                 __perf_counter_exit_task(child_counter, child_ctx, child);
 
         /*
@@ -4679,7 +4678,7 @@ again:
          * its siblings to the list, but we obtained 'tmp' before that which
          * will still point to the list head terminating the iteration.
          */
-        if (!list_empty(&child_ctx->counter_list))
+        if (!list_empty(&child_ctx->group_list))
                 goto again;
 
         mutex_unlock(&child_ctx->mutex);
@@ -4701,7 +4700,7 @@ void perf_counter_free_task(struct task_struct *task)
 
         mutex_lock(&ctx->mutex);
 again:
-        list_for_each_entry_safe(counter, tmp, &ctx->counter_list, list_entry) {
+        list_for_each_entry_safe(counter, tmp, &ctx->group_list, group_entry) {
                 struct perf_counter *parent = counter->parent;
 
                 if (WARN_ON_ONCE(!parent))
@@ -4717,7 +4716,7 @@ again:
                 free_counter(counter);
         }
 
-        if (!list_empty(&ctx->counter_list))
+        if (!list_empty(&ctx->group_list))
                 goto again;
 
         mutex_unlock(&ctx->mutex);
@@ -4847,7 +4846,7 @@ static void __perf_counter_exit_cpu(void *info)
         struct perf_counter_context *ctx = &cpuctx->ctx;
         struct perf_counter *counter, *tmp;
 
-        list_for_each_entry_safe(counter, tmp, &ctx->counter_list, list_entry)
+        list_for_each_entry_safe(counter, tmp, &ctx->group_list, group_entry)
                 __perf_counter_remove_from_context(counter);
 }
 static void perf_counter_exit_cpu(int cpu)