1 files changed, 413 insertions, 214 deletions

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 2ae7409bf38f..a661e7991865 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -98,11 +98,12 @@ void __weak hw_perf_enable(void)		{ barrier(); }
 
 void __weak hw_perf_event_setup(int cpu)        { barrier(); }
 void __weak hw_perf_event_setup_online(int cpu) { barrier(); }
+void __weak hw_perf_event_setup_offline(int cpu)        { barrier(); }
 
 int __weak
 hw_perf_group_sched_in(struct perf_event *group_leader,
                struct perf_cpu_context *cpuctx,
-               struct perf_event_context *ctx, int cpu)
+               struct perf_event_context *ctx)
 {
         return 0;
 }
@@ -248,7 +249,7 @@ static void perf_unpin_context(struct perf_event_context *ctx)
 
 static inline u64 perf_clock(void)
 {
-        return cpu_clock(smp_processor_id());
+        return cpu_clock(raw_smp_processor_id());
 }
 
 /*
@@ -289,6 +290,15 @@ static void update_event_times(struct perf_event *event)
         event->total_time_running = run_end - event->tstamp_running;
 }
 
+static struct list_head *
+ctx_group_list(struct perf_event *event, struct perf_event_context *ctx)
+{
+        if (event->attr.pinned)
+                return &ctx->pinned_groups;
+        else
+                return &ctx->flexible_groups;
+}
+
 /*
  * Add a event from the lists for its context.
  * Must be called with ctx->mutex and ctx->lock held.
@@ -303,9 +313,19 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
          * add it straight to the context's event list, or to the group
          * leader's sibling list:
          */
-        if (group_leader == event)
-                list_add_tail(&event->group_entry, &ctx->group_list);
-        else {
+        if (group_leader == event) {
+                struct list_head *list;
+
+                if (is_software_event(event))
+                        event->group_flags |= PERF_GROUP_SOFTWARE;
+
+                list = ctx_group_list(event, ctx);
+                list_add_tail(&event->group_entry, list);
+        } else {
+                if (group_leader->group_flags & PERF_GROUP_SOFTWARE &&
+                    !is_software_event(event))
+                        group_leader->group_flags &= ~PERF_GROUP_SOFTWARE;
+
                 list_add_tail(&event->group_entry, &group_leader->sibling_list);
                 group_leader->nr_siblings++;
         }
@@ -355,9 +375,14 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
          * to the context list directly:
          */
         list_for_each_entry_safe(sibling, tmp, &event->sibling_list, group_entry) {
+                struct list_head *list;
 
-                list_move_tail(&sibling->group_entry, &ctx->group_list);
+                list = ctx_group_list(event, ctx);
+                list_move_tail(&sibling->group_entry, list);
                 sibling->group_leader = sibling;
+
+                /* Inherit group flags from the previous leader */
+                sibling->group_flags = event->group_flags;
         }
 }
 
@@ -608,14 +633,13 @@ void perf_event_disable(struct perf_event *event)
 static int
 event_sched_in(struct perf_event *event,
                  struct perf_cpu_context *cpuctx,
-                 struct perf_event_context *ctx,
-                 int cpu)
+                 struct perf_event_context *ctx)
 {
         if (event->state <= PERF_EVENT_STATE_OFF)
                 return 0;
 
         event->state = PERF_EVENT_STATE_ACTIVE;
-        event->oncpu = cpu;     /* TODO: put 'cpu' into cpuctx->cpu */
+        event->oncpu = smp_processor_id();
         /*
          * The new state must be visible before we turn it on in the hardware:
          */
@@ -642,8 +666,7 @@ event_sched_in(struct perf_event *event,
 static int
 group_sched_in(struct perf_event *group_event,
                struct perf_cpu_context *cpuctx,
-               struct perf_event_context *ctx,
-               int cpu)
+               struct perf_event_context *ctx)
 {
         struct perf_event *event, *partial_group;
         int ret;
@@ -651,18 +674,18 @@ group_sched_in(struct perf_event *group_event,
         if (group_event->state == PERF_EVENT_STATE_OFF)
                 return 0;
 
-        ret = hw_perf_group_sched_in(group_event, cpuctx, ctx, cpu);
+        ret = hw_perf_group_sched_in(group_event, cpuctx, ctx);
         if (ret)
                 return ret < 0 ? ret : 0;
 
-        if (event_sched_in(group_event, cpuctx, ctx, cpu))
+        if (event_sched_in(group_event, cpuctx, ctx))
                 return -EAGAIN;
 
         /*
          * Schedule in siblings as one group (if any):
          */
         list_for_each_entry(event, &group_event->sibling_list, group_entry) {
-                if (event_sched_in(event, cpuctx, ctx, cpu)) {
+                if (event_sched_in(event, cpuctx, ctx)) {
                         partial_group = event;
                         goto group_error;
                 }
@@ -686,24 +709,6 @@ group_error:
 }
 
 /*
- * 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_event *leader)
-{
-        struct perf_event *event;
-
-        if (!is_software_event(leader))
-                return 0;
-
-        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 event group on the CPU now.
  */
 static int group_can_go_on(struct perf_event *event,
@@ -713,7 +718,7 @@ static int group_can_go_on(struct perf_event *event,
         /*
          * Groups consisting entirely of software events can always go on.
          */
-        if (is_software_only_group(event))
+        if (event->group_flags & PERF_GROUP_SOFTWARE)
                 return 1;
         /*
          * If an exclusive group is already on, no other hardware
@@ -754,7 +759,6 @@ static void __perf_install_in_context(void *info)
         struct perf_event *event = info;
         struct perf_event_context *ctx = event->ctx;
         struct perf_event *leader = event->group_leader;
-        int cpu = smp_processor_id();
         int err;
 
         /*
@@ -801,7 +805,7 @@ static void __perf_install_in_context(void *info)
         if (!group_can_go_on(event, cpuctx, 1))
                 err = -EEXIST;
         else
-                err = event_sched_in(event, cpuctx, ctx, cpu);
+                err = event_sched_in(event, cpuctx, ctx);
 
         if (err) {
                 /*
@@ -943,11 +947,9 @@ static void __perf_event_enable(void *info)
         } else {
                 perf_disable();
                 if (event == leader)
-                        err = group_sched_in(event, cpuctx, ctx,
-                                             smp_processor_id());
+                        err = group_sched_in(event, cpuctx, ctx);
                 else
-                        err = event_sched_in(event, cpuctx, ctx,
-                                               smp_processor_id());
+                        err = event_sched_in(event, cpuctx, ctx);
                 perf_enable();
         }
 
@@ -1043,8 +1045,15 @@ static int perf_event_refresh(struct perf_event *event, int refresh)
         return 0;
 }
 
-void __perf_event_sched_out(struct perf_event_context *ctx,
-                              struct perf_cpu_context *cpuctx)
+enum event_type_t {
+        EVENT_FLEXIBLE = 0x1,
+        EVENT_PINNED = 0x2,
+        EVENT_ALL = EVENT_FLEXIBLE | EVENT_PINNED,
+};
+
+static void ctx_sched_out(struct perf_event_context *ctx,
+                          struct perf_cpu_context *cpuctx,
+                          enum event_type_t event_type)
 {
         struct perf_event *event;
 
@@ -1055,10 +1064,18 @@ void __perf_event_sched_out(struct perf_event_context *ctx,
         update_context_time(ctx);
 
         perf_disable();
-        if (ctx->nr_active) {
-                list_for_each_entry(event, &ctx->group_list, group_entry)
+        if (!ctx->nr_active)
+                goto out_enable;
+
+        if (event_type & EVENT_PINNED)
+                list_for_each_entry(event, &ctx->pinned_groups, group_entry)
                         group_sched_out(event, cpuctx, ctx);
-        }
+
+        if (event_type & EVENT_FLEXIBLE)
+                list_for_each_entry(event, &ctx->flexible_groups, group_entry)
+                        group_sched_out(event, cpuctx, ctx);
+
+ out_enable:
         perf_enable();
  out:
         raw_spin_unlock(&ctx->lock);
@@ -1170,9 +1187,9 @@ static void perf_event_sync_stat(struct perf_event_context *ctx,
  * not restart the event.
  */
 void perf_event_task_sched_out(struct task_struct *task,
-                                 struct task_struct *next, int cpu)
+                                 struct task_struct *next)
 {
-        struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
         struct perf_event_context *ctx = task->perf_event_ctxp;
         struct perf_event_context *next_ctx;
         struct perf_event_context *parent;
@@ -1220,15 +1237,13 @@ void perf_event_task_sched_out(struct task_struct *task,
         rcu_read_unlock();
 
         if (do_switch) {
-                __perf_event_sched_out(ctx, cpuctx);
+                ctx_sched_out(ctx, cpuctx, EVENT_ALL);
                 cpuctx->task_ctx = NULL;
         }
 }
 
-/*
- * Called with IRQs disabled
- */
-static void __perf_event_task_sched_out(struct perf_event_context *ctx)
+static void task_ctx_sched_out(struct perf_event_context *ctx,
+                               enum event_type_t event_type)
 {
         struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
 
@@ -1238,47 +1253,41 @@ static void __perf_event_task_sched_out(struct perf_event_context *ctx)
         if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
                 return;
 
-        __perf_event_sched_out(ctx, cpuctx);
+        ctx_sched_out(ctx, cpuctx, event_type);
         cpuctx->task_ctx = NULL;
 }
 
 /*
  * Called with IRQs disabled
  */
-static void perf_event_cpu_sched_out(struct perf_cpu_context *cpuctx)
+static void __perf_event_task_sched_out(struct perf_event_context *ctx)
+{
+        task_ctx_sched_out(ctx, EVENT_ALL);
+}
+
+/*
+ * Called with IRQs disabled
+ */
+static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
+                              enum event_type_t event_type)
 {
-        __perf_event_sched_out(&cpuctx->ctx, cpuctx);
+        ctx_sched_out(&cpuctx->ctx, cpuctx, event_type);
 }
 
 static void
-__perf_event_sched_in(struct perf_event_context *ctx,
-                        struct perf_cpu_context *cpuctx, int cpu)
+ctx_pinned_sched_in(struct perf_event_context *ctx,
+                    struct perf_cpu_context *cpuctx)
 {
         struct perf_event *event;
-        int can_add_hw = 1;
-
-        raw_spin_lock(&ctx->lock);
-        ctx->is_active = 1;
-        if (likely(!ctx->nr_events))
-                goto out;
 
-        ctx->timestamp = perf_clock();
-
-        perf_disable();
-
-        /*
-         * 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(event, &ctx->group_list, group_entry) {
-                if (event->state <= PERF_EVENT_STATE_OFF ||
-                    !event->attr.pinned)
+        list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
+                if (event->state <= PERF_EVENT_STATE_OFF)
                         continue;
-                if (event->cpu != -1 && event->cpu != cpu)
+                if (event->cpu != -1 && event->cpu != smp_processor_id())
                         continue;
 
                 if (group_can_go_on(event, cpuctx, 1))
-                        group_sched_in(event, cpuctx, ctx, cpu);
+                        group_sched_in(event, cpuctx, ctx);
 
                 /*
                  * If this pinned group hasn't been scheduled,
@@ -1289,32 +1298,83 @@ __perf_event_sched_in(struct perf_event_context *ctx,
                         event->state = PERF_EVENT_STATE_ERROR;
                 }
         }
+}
 
-        list_for_each_entry(event, &ctx->group_list, group_entry) {
-                /*
-                 * Ignore events in OFF or ERROR state, and
-                 * ignore pinned events since we did them already.
-                 */
-                if (event->state <= PERF_EVENT_STATE_OFF ||
-                    event->attr.pinned)
-                        continue;
+static void
+ctx_flexible_sched_in(struct perf_event_context *ctx,
+                      struct perf_cpu_context *cpuctx)
+{
+        struct perf_event *event;
+        int can_add_hw = 1;
 
+        list_for_each_entry(event, &ctx->flexible_groups, group_entry) {
+                /* Ignore events in OFF or ERROR state */
+                if (event->state <= PERF_EVENT_STATE_OFF)
+                        continue;
                 /*
                  * Listen to the 'cpu' scheduling filter constraint
                  * of events:
                  */
-                if (event->cpu != -1 && event->cpu != cpu)
+                if (event->cpu != -1 && event->cpu != smp_processor_id())
                         continue;
 
                 if (group_can_go_on(event, cpuctx, can_add_hw))
-                        if (group_sched_in(event, cpuctx, ctx, cpu))
+                        if (group_sched_in(event, cpuctx, ctx))
                                 can_add_hw = 0;
         }
+}
+
+static void
+ctx_sched_in(struct perf_event_context *ctx,
+             struct perf_cpu_context *cpuctx,
+             enum event_type_t event_type)
+{
+        raw_spin_lock(&ctx->lock);
+        ctx->is_active = 1;
+        if (likely(!ctx->nr_events))
+                goto out;
+
+        ctx->timestamp = perf_clock();
+
+        perf_disable();
+
+        /*
+         * First go through the list and put on any pinned groups
+         * in order to give them the best chance of going on.
+         */
+        if (event_type & EVENT_PINNED)
+                ctx_pinned_sched_in(ctx, cpuctx);
+
+        /* Then walk through the lower prio flexible groups */
+        if (event_type & EVENT_FLEXIBLE)
+                ctx_flexible_sched_in(ctx, cpuctx);
+
         perf_enable();
  out:
         raw_spin_unlock(&ctx->lock);
 }
 
+static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
+                             enum event_type_t event_type)
+{
+        struct perf_event_context *ctx = &cpuctx->ctx;
+
+        ctx_sched_in(ctx, cpuctx, event_type);
+}
+
+static void task_ctx_sched_in(struct task_struct *task,
+                              enum event_type_t event_type)
+{
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+        struct perf_event_context *ctx = task->perf_event_ctxp;
+
+        if (likely(!ctx))
+                return;
+        if (cpuctx->task_ctx == ctx)
+                return;
+        ctx_sched_in(ctx, cpuctx, event_type);
+        cpuctx->task_ctx = ctx;
+}
 /*
  * Called from scheduler to add the events of the current task
  * with interrupts disabled.
@@ -1326,38 +1386,128 @@ __perf_event_sched_in(struct perf_event_context *ctx,
  * accessing the event control register. If a NMI hits, then it will
  * keep the event running.
  */
-void perf_event_task_sched_in(struct task_struct *task, int cpu)
+void perf_event_task_sched_in(struct task_struct *task)
 {
-        struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
+        struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
         struct perf_event_context *ctx = task->perf_event_ctxp;
 
         if (likely(!ctx))
                 return;
+
         if (cpuctx->task_ctx == ctx)
                 return;
-        __perf_event_sched_in(ctx, cpuctx, cpu);
+
+        /*
+         * We want to keep the following priority order:
+         * cpu pinned (that don't need to move), task pinned,
+         * cpu flexible, task flexible.
+         */
+        cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
+
+        ctx_sched_in(ctx, cpuctx, EVENT_PINNED);
+        cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
+        ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE);
+
         cpuctx->task_ctx = ctx;
 }
 
-static void perf_event_cpu_sched_in(struct perf_cpu_context *cpuctx, int cpu)
+#define MAX_INTERRUPTS (~0ULL)
+
+static void perf_log_throttle(struct perf_event *event, int enable);
+
+static u64 perf_calculate_period(struct perf_event *event, u64 nsec, u64 count)
 {
-        struct perf_event_context *ctx = &cpuctx->ctx;
+        u64 frequency = event->attr.sample_freq;
+        u64 sec = NSEC_PER_SEC;
+        u64 divisor, dividend;
+
+        int count_fls, nsec_fls, frequency_fls, sec_fls;
+
+        count_fls = fls64(count);
+        nsec_fls = fls64(nsec);
+        frequency_fls = fls64(frequency);
+        sec_fls = 30;
 
-        __perf_event_sched_in(ctx, cpuctx, cpu);
+        /*
+         * We got @count in @nsec, with a target of sample_freq HZ
+         * the target period becomes:
+         *
+         *             @count * 10^9
+         * period = -------------------
+         *          @nsec * sample_freq
+         *
+         */
+
+        /*
+         * Reduce accuracy by one bit such that @a and @b converge
+         * to a similar magnitude.
+         */
+#define REDUCE_FLS(a, b)                \
+do {                                    \
+        if (a##_fls > b##_fls) {        \
+                a >>= 1;                \
+                a##_fls--;              \
+        } else {                        \
+                b >>= 1;                \
+                b##_fls--;              \
+        }                               \
+} while (0)
+
+        /*
+         * Reduce accuracy until either term fits in a u64, then proceed with
+         * the other, so that finally we can do a u64/u64 division.
+         */
+        while (count_fls + sec_fls > 64 && nsec_fls + frequency_fls > 64) {
+                REDUCE_FLS(nsec, frequency);
+                REDUCE_FLS(sec, count);
+        }
+
+        if (count_fls + sec_fls > 64) {
+                divisor = nsec * frequency;
+
+                while (count_fls + sec_fls > 64) {
+                        REDUCE_FLS(count, sec);
+                        divisor >>= 1;
+                }
+
+                dividend = count * sec;
+        } else {
+                dividend = count * sec;
+
+                while (nsec_fls + frequency_fls > 64) {
+                        REDUCE_FLS(nsec, frequency);
+                        dividend >>= 1;
+                }
+
+                divisor = nsec * frequency;
+        }
+
+        return div64_u64(dividend, divisor);
 }
 
-#define MAX_INTERRUPTS (~0ULL)
+static void perf_event_stop(struct perf_event *event)
+{
+        if (!event->pmu->stop)
+                return event->pmu->disable(event);
 
-static void perf_log_throttle(struct perf_event *event, int enable);
+        return event->pmu->stop(event);
+}
+
+static int perf_event_start(struct perf_event *event)
+{
+        if (!event->pmu->start)
+                return event->pmu->enable(event);
 
-static void perf_adjust_period(struct perf_event *event, u64 events)
+        return event->pmu->start(event);
+}
+
+static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
 {
         struct hw_perf_event *hwc = &event->hw;
         u64 period, sample_period;
         s64 delta;
 
-        events *= hwc->sample_period;
-        period = div64_u64(events, event->attr.sample_freq);
+        period = perf_calculate_period(event, nsec, count);
 
         delta = (s64)(period - hwc->sample_period);
         delta = (delta + 7) / 8; /* low pass filter */
@@ -1368,13 +1518,22 @@ static void perf_adjust_period(struct perf_event *event, u64 events)
                 sample_period = 1;
 
         hwc->sample_period = sample_period;
+
+        if (atomic64_read(&hwc->period_left) > 8*sample_period) {
+                perf_disable();
+                perf_event_stop(event);
+                atomic64_set(&hwc->period_left, 0);
+                perf_event_start(event);
+                perf_enable();
+        }
 }
 
 static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
 {
         struct perf_event *event;
         struct hw_perf_event *hwc;
-        u64 interrupts, freq;
+        u64 interrupts, now;
+        s64 delta;
 
         raw_spin_lock(&ctx->lock);
         list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
@@ -1395,44 +1554,18 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
                 if (interrupts == MAX_INTERRUPTS) {
                         perf_log_throttle(event, 1);
                         event->pmu->unthrottle(event);
-                        interrupts = 2*sysctl_perf_event_sample_rate/HZ;
                 }
 
                 if (!event->attr.freq || !event->attr.sample_freq)
                         continue;
 
-                /*
-                 * if the specified freq < HZ then we need to skip ticks
-                 */
-                if (event->attr.sample_freq < HZ) {
-                        freq = event->attr.sample_freq;
-
-                        hwc->freq_count += freq;
-                        hwc->freq_interrupts += interrupts;
-
-                        if (hwc->freq_count < HZ)
-                                continue;
-
-                        interrupts = hwc->freq_interrupts;
-                        hwc->freq_interrupts = 0;
-                        hwc->freq_count -= HZ;
-                } else
-                        freq = HZ;
-
-                perf_adjust_period(event, freq * interrupts);
+                event->pmu->read(event);
+                now = atomic64_read(&event->count);
+                delta = now - hwc->freq_count_stamp;
+                hwc->freq_count_stamp = now;
 
-                /*
-                 * In order to avoid being stalled by an (accidental) huge
-                 * sample period, force reset the sample period if we didn't
-                 * get any events in this freq period.
-                 */
-                if (!interrupts) {
-                        perf_disable();
-                        event->pmu->disable(event);
-                        atomic64_set(&hwc->period_left, 0);
-                        event->pmu->enable(event);
-                        perf_enable();
-                }
+                if (delta > 0)
+                        perf_adjust_period(event, TICK_NSEC, delta);
         }
         raw_spin_unlock(&ctx->lock);
 }
@@ -1442,26 +1575,18 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
  */
 static void rotate_ctx(struct perf_event_context *ctx)
 {
-        struct perf_event *event;
-
         if (!ctx->nr_events)
                 return;
 
         raw_spin_lock(&ctx->lock);
-        /*
-         * Rotate the first entry last (works just fine for group events too):
-         */
-        perf_disable();
-        list_for_each_entry(event, &ctx->group_list, group_entry) {
-                list_move_tail(&event->group_entry, &ctx->group_list);
-                break;
-        }
-        perf_enable();
+
+        /* Rotate the first entry last of non-pinned groups */
+        list_rotate_left(&ctx->flexible_groups);
 
         raw_spin_unlock(&ctx->lock);
 }
 
-void perf_event_task_tick(struct task_struct *curr, int cpu)
+void perf_event_task_tick(struct task_struct *curr)
 {
         struct perf_cpu_context *cpuctx;
         struct perf_event_context *ctx;
@@ -1469,24 +1594,43 @@ void perf_event_task_tick(struct task_struct *curr, int cpu)
         if (!atomic_read(&nr_events))
                 return;
 
-        cpuctx = &per_cpu(perf_cpu_context, cpu);
+        cpuctx = &__get_cpu_var(perf_cpu_context);
         ctx = curr->perf_event_ctxp;
 
+        perf_disable();
+
         perf_ctx_adjust_freq(&cpuctx->ctx);
         if (ctx)
                 perf_ctx_adjust_freq(ctx);
 
-        perf_event_cpu_sched_out(cpuctx);
+        cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
         if (ctx)
-                __perf_event_task_sched_out(ctx);
+                task_ctx_sched_out(ctx, EVENT_FLEXIBLE);
 
         rotate_ctx(&cpuctx->ctx);
         if (ctx)
                 rotate_ctx(ctx);
 
-        perf_event_cpu_sched_in(cpuctx, cpu);
+        cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
         if (ctx)
-                perf_event_task_sched_in(curr, cpu);
+                task_ctx_sched_in(curr, EVENT_FLEXIBLE);
+
+        perf_enable();
+}
+
+static int event_enable_on_exec(struct perf_event *event,
+                                struct perf_event_context *ctx)
+{
+        if (!event->attr.enable_on_exec)
+                return 0;
+
+        event->attr.enable_on_exec = 0;
+        if (event->state >= PERF_EVENT_STATE_INACTIVE)
+                return 0;
+
+        __perf_event_mark_enabled(event, ctx);
+
+        return 1;
 }
 
 /*
@@ -1499,6 +1643,7 @@ static void perf_event_enable_on_exec(struct task_struct *task)
         struct perf_event *event;
         unsigned long flags;
         int enabled = 0;
+        int ret;
 
         local_irq_save(flags);
         ctx = task->perf_event_ctxp;
@@ -1509,14 +1654,16 @@ static void perf_event_enable_on_exec(struct task_struct *task)
 
         raw_spin_lock(&ctx->lock);
 
-        list_for_each_entry(event, &ctx->group_list, group_entry) {
-                if (!event->attr.enable_on_exec)
-                        continue;
-                event->attr.enable_on_exec = 0;
-                if (event->state >= PERF_EVENT_STATE_INACTIVE)
-                        continue;
-                __perf_event_mark_enabled(event, ctx);
-                enabled = 1;
+        list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
+                ret = event_enable_on_exec(event, ctx);
+                if (ret)
+                        enabled = 1;
+        }
+
+        list_for_each_entry(event, &ctx->flexible_groups, group_entry) {
+                ret = event_enable_on_exec(event, ctx);
+                if (ret)
+                        enabled = 1;
         }
 
         /*
@@ -1527,7 +1674,7 @@ static void perf_event_enable_on_exec(struct task_struct *task)
 
         raw_spin_unlock(&ctx->lock);
 
-        perf_event_task_sched_in(task, smp_processor_id());
+        perf_event_task_sched_in(task);
  out:
         local_irq_restore(flags);
 }
@@ -1590,7 +1737,8 @@ __perf_event_init_context(struct perf_event_context *ctx,
 {
         raw_spin_lock_init(&ctx->lock);
         mutex_init(&ctx->mutex);
-        INIT_LIST_HEAD(&ctx->group_list);
+        INIT_LIST_HEAD(&ctx->pinned_groups);
+        INIT_LIST_HEAD(&ctx->flexible_groups);
         INIT_LIST_HEAD(&ctx->event_list);
         atomic_set(&ctx->refcount, 1);
         ctx->task = task;
@@ -3608,7 +3756,7 @@ void __perf_event_mmap(struct vm_area_struct *vma)
                         /* .tid */
                         .start  = vma->vm_start,
                         .len    = vma->vm_end - vma->vm_start,
-                        .pgoff  = vma->vm_pgoff,
+                        .pgoff  = (u64)vma->vm_pgoff << PAGE_SHIFT,
                 },
         };
 
@@ -3688,12 +3836,12 @@ static int __perf_event_overflow(struct perf_event *event, int nmi,
 
         if (event->attr.freq) {
                 u64 now = perf_clock();
-                s64 delta = now - hwc->freq_stamp;
+                s64 delta = now - hwc->freq_time_stamp;
 
-                hwc->freq_stamp = now;
+                hwc->freq_time_stamp = now;
 
-                if (delta > 0 && delta < TICK_NSEC)
-                        perf_adjust_period(event, NSEC_PER_SEC / (int)delta);
+                if (delta > 0 && delta < 2*TICK_NSEC)
+                        perf_adjust_period(event, delta, hwc->last_period);
         }
 
         /*
@@ -4184,7 +4332,7 @@ static const struct pmu perf_ops_task_clock = {
         .read           = task_clock_perf_event_read,
 };
 
-#ifdef CONFIG_EVENT_PROFILE
+#ifdef CONFIG_EVENT_TRACING
 
 void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
                           int entry_size)
@@ -4289,7 +4437,7 @@ static void perf_event_free_filter(struct perf_event *event)
 {
 }
 
-#endif /* CONFIG_EVENT_PROFILE */
+#endif /* CONFIG_EVENT_TRACING */
 
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 static void bp_perf_event_destroy(struct perf_event *event)
@@ -4870,8 +5018,15 @@ inherit_event(struct perf_event *parent_event,
         else
                 child_event->state = PERF_EVENT_STATE_OFF;
 
-        if (parent_event->attr.freq)
-                child_event->hw.sample_period = parent_event->hw.sample_period;
+        if (parent_event->attr.freq) {
+                u64 sample_period = parent_event->hw.sample_period;
+                struct hw_perf_event *hwc = &child_event->hw;
+
+                hwc->sample_period = sample_period;
+                hwc->last_period   = sample_period;
+
+                atomic64_set(&hwc->period_left, sample_period);
+        }
 
         child_event->overflow_handler = parent_event->overflow_handler;
 
@@ -5039,7 +5194,11 @@ void perf_event_exit_task(struct task_struct *child)
         mutex_lock_nested(&child_ctx->mutex, SINGLE_DEPTH_NESTING);
 
 again:
-        list_for_each_entry_safe(child_event, tmp, &child_ctx->group_list,
+        list_for_each_entry_safe(child_event, tmp, &child_ctx->pinned_groups,
+                                 group_entry)
+                __perf_event_exit_task(child_event, child_ctx, child);
+
+        list_for_each_entry_safe(child_event, tmp, &child_ctx->flexible_groups,
                                  group_entry)
                 __perf_event_exit_task(child_event, child_ctx, child);
 
@@ -5048,7 +5207,8 @@ 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->group_list))
+        if (!list_empty(&child_ctx->pinned_groups) ||
+            !list_empty(&child_ctx->flexible_groups))
                 goto again;
 
         mutex_unlock(&child_ctx->mutex);
@@ -5056,6 +5216,24 @@ again:
         put_ctx(child_ctx);
 }
 
+static void perf_free_event(struct perf_event *event,
+                            struct perf_event_context *ctx)
+{
+        struct perf_event *parent = event->parent;
+
+        if (WARN_ON_ONCE(!parent))
+                return;
+
+        mutex_lock(&parent->child_mutex);
+        list_del_init(&event->child_list);
+        mutex_unlock(&parent->child_mutex);
+
+        fput(parent->filp);
+
+        list_del_event(event, ctx);
+        free_event(event);
+}
+
 /*
  * free an unexposed, unused context as created by inheritance by
  * init_task below, used by fork() in case of fail.
@@ -5070,36 +5248,70 @@ void perf_event_free_task(struct task_struct *task)
 
         mutex_lock(&ctx->mutex);
 again:
-        list_for_each_entry_safe(event, tmp, &ctx->group_list, group_entry) {
-                struct perf_event *parent = event->parent;
+        list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry)
+                perf_free_event(event, ctx);
 
-                if (WARN_ON_ONCE(!parent))
-                        continue;
+        list_for_each_entry_safe(event, tmp, &ctx->flexible_groups,
+                                 group_entry)
+                perf_free_event(event, ctx);
 
-                mutex_lock(&parent->child_mutex);
-                list_del_init(&event->child_list);
-                mutex_unlock(&parent->child_mutex);
+        if (!list_empty(&ctx->pinned_groups) ||
+            !list_empty(&ctx->flexible_groups))
+                goto again;
 
-                fput(parent->filp);
+        mutex_unlock(&ctx->mutex);
 
-                list_del_event(event, ctx);
-                free_event(event);
+        put_ctx(ctx);
+}
+
+static int
+inherit_task_group(struct perf_event *event, struct task_struct *parent,
+                   struct perf_event_context *parent_ctx,
+                   struct task_struct *child,
+                   int *inherited_all)
+{
+        int ret;
+        struct perf_event_context *child_ctx = child->perf_event_ctxp;
+
+        if (!event->attr.inherit) {
+                *inherited_all = 0;
+                return 0;
         }
 
-        if (!list_empty(&ctx->group_list))
-                goto again;
+        if (!child_ctx) {
+                /*
+                 * This is executed from the parent task context, so
+                 * inherit events that have been marked for cloning.
+                 * First allocate and initialize a context for the
+                 * child.
+                 */
 
-        mutex_unlock(&ctx->mutex);
+                child_ctx = kzalloc(sizeof(struct perf_event_context),
+                                    GFP_KERNEL);
+                if (!child_ctx)
+                        return -ENOMEM;
 
-        put_ctx(ctx);
+                __perf_event_init_context(child_ctx, child);
+                child->perf_event_ctxp = child_ctx;
+                get_task_struct(child);
+        }
+
+        ret = inherit_group(event, parent, parent_ctx,
+                            child, child_ctx);
+
+        if (ret)
+                *inherited_all = 0;
+
+        return ret;
 }
 
+
 /*
  * Initialize the perf_event context in task_struct
  */
 int perf_event_init_task(struct task_struct *child)
 {
-        struct perf_event_context *child_ctx = NULL, *parent_ctx;
+        struct perf_event_context *child_ctx, *parent_ctx;
         struct perf_event_context *cloned_ctx;
         struct perf_event *event;
         struct task_struct *parent = current;
@@ -5137,41 +5349,22 @@ int perf_event_init_task(struct task_struct *child)
          * We dont have to disable NMIs - we are only looking at
          * the list, not manipulating it:
          */
-        list_for_each_entry(event, &parent_ctx->group_list, group_entry) {
-
-                if (!event->attr.inherit) {
-                        inherited_all = 0;
-                        continue;
-                }
-
-                if (!child->perf_event_ctxp) {
-                        /*
-                         * This is executed from the parent task context, so
-                         * inherit events that have been marked for cloning.
-                         * First allocate and initialize a context for the
-                         * child.
-                         */
-
-                        child_ctx = kzalloc(sizeof(struct perf_event_context),
-                                            GFP_KERNEL);
-                        if (!child_ctx) {
-                                ret = -ENOMEM;
-                                break;
-                        }
-
-                        __perf_event_init_context(child_ctx, child);
-                        child->perf_event_ctxp = child_ctx;
-                        get_task_struct(child);
-                }
+        list_for_each_entry(event, &parent_ctx->pinned_groups, group_entry) {
+                ret = inherit_task_group(event, parent, parent_ctx, child,
+                                         &inherited_all);
+                if (ret)
+                        break;
+        }
 
-                ret = inherit_group(event, parent, parent_ctx,
-                                             child, child_ctx);
-                if (ret) {
-                        inherited_all = 0;
+        list_for_each_entry(event, &parent_ctx->flexible_groups, group_entry) {
+                ret = inherit_task_group(event, parent, parent_ctx, child,
+                                         &inherited_all);
+                if (ret)
                         break;
-                }
         }
 
+        child_ctx = child->perf_event_ctxp;
+
         if (child_ctx && inherited_all) {
                 /*
                  * Mark the child context as a clone of the parent
@@ -5220,7 +5413,9 @@ static void __perf_event_exit_cpu(void *info)
         struct perf_event_context *ctx = &cpuctx->ctx;
         struct perf_event *event, *tmp;
 
-        list_for_each_entry_safe(event, tmp, &ctx->group_list, group_entry)
+        list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry)
+                __perf_event_remove_from_context(event);
+        list_for_each_entry_safe(event, tmp, &ctx->flexible_groups, group_entry)
                 __perf_event_remove_from_context(event);
 }
 static void perf_event_exit_cpu(int cpu)
@@ -5258,6 +5453,10 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
                 perf_event_exit_cpu(cpu);
                 break;
 
+        case CPU_DEAD:
+                hw_perf_event_setup_offline(cpu);
+                break;
+
         default:
                 break;
         }