perf_counter: Introduce struct for sample data

For easy extension of the sample data, put it in a structure.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 16 deletions

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index ae591a1275a6..4fe85e804f43 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2378,8 +2378,8 @@ static u32 perf_counter_tid(struct perf_counter *counter, struct task_struct *p)
         return task_pid_nr_ns(p, counter->ns);
 }
 
-static void perf_counter_output(struct perf_counter *counter,
-                                int nmi, struct pt_regs *regs, u64 addr)
+static void perf_counter_output(struct perf_counter *counter, int nmi,
+                                struct perf_sample_data *data)
 {
         int ret;
         u64 sample_type = counter->attr.sample_type;
@@ -2404,10 +2404,10 @@ static void perf_counter_output(struct perf_counter *counter,
         header.size = sizeof(header);
 
         header.misc = PERF_EVENT_MISC_OVERFLOW;
-        header.misc |= perf_misc_flags(regs);
+        header.misc |= perf_misc_flags(data->regs);
 
         if (sample_type & PERF_SAMPLE_IP) {
-                ip = perf_instruction_pointer(regs);
+                ip = perf_instruction_pointer(data->regs);
                 header.type |= PERF_SAMPLE_IP;
                 header.size += sizeof(ip);
         }
@@ -2460,7 +2460,7 @@ static void perf_counter_output(struct perf_counter *counter,
         }
 
         if (sample_type & PERF_SAMPLE_CALLCHAIN) {
-                callchain = perf_callchain(regs);
+                callchain = perf_callchain(data->regs);
 
                 if (callchain) {
                         callchain_size = (1 + callchain->nr) * sizeof(u64);
@@ -2486,7 +2486,7 @@ static void perf_counter_output(struct perf_counter *counter,
                 perf_output_put(&handle, time);
 
         if (sample_type & PERF_SAMPLE_ADDR)
-                perf_output_put(&handle, addr);
+                perf_output_put(&handle, data->addr);
 
         if (sample_type & PERF_SAMPLE_ID)
                 perf_output_put(&handle, counter->id);
@@ -2950,8 +2950,8 @@ static void perf_log_throttle(struct perf_counter *counter, int enable)
  * Generic counter overflow handling.
  */
 
-int perf_counter_overflow(struct perf_counter *counter,
-                          int nmi, struct pt_regs *regs, u64 addr)
+int perf_counter_overflow(struct perf_counter *counter, int nmi,
+                          struct perf_sample_data *data)
 {
         int events = atomic_read(&counter->event_limit);
         int throttle = counter->pmu->unthrottle != NULL;
@@ -3005,7 +3005,7 @@ int perf_counter_overflow(struct perf_counter *counter,
                         perf_counter_disable(counter);
         }
 
-        perf_counter_output(counter, nmi, regs, addr);
+        perf_counter_output(counter, nmi, data);
         return ret;
 }
 
@@ -3054,24 +3054,25 @@ static void perf_swcounter_set_period(struct perf_counter *counter)
 static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
 {
         enum hrtimer_restart ret = HRTIMER_RESTART;
+        struct perf_sample_data data;
         struct perf_counter *counter;
-        struct pt_regs *regs;
         u64 period;
 
         counter = container_of(hrtimer, struct perf_counter, hw.hrtimer);
         counter->pmu->read(counter);
 
-        regs = get_irq_regs();
+        data.addr = 0;
+        data.regs = get_irq_regs();
         /*
          * In case we exclude kernel IPs or are somehow not in interrupt
          * context, provide the next best thing, the user IP.
          */
-        if ((counter->attr.exclude_kernel || !regs) &&
+        if ((counter->attr.exclude_kernel || !data.regs) &&
                         !counter->attr.exclude_user)
-                regs = task_pt_regs(current);
+                data.regs = task_pt_regs(current);
 
-        if (regs) {
-                if (perf_counter_overflow(counter, 0, regs, 0))
+        if (data.regs) {
+                if (perf_counter_overflow(counter, 0, &data))
                         ret = HRTIMER_NORESTART;
         }
 
@@ -3084,9 +3085,14 @@ static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
 static void perf_swcounter_overflow(struct perf_counter *counter,
                                     int nmi, struct pt_regs *regs, u64 addr)
 {
+        struct perf_sample_data data = {
+                .regs = regs,
+                .addr = addr,
+        };
+
         perf_swcounter_update(counter);
         perf_swcounter_set_period(counter);
-        if (perf_counter_overflow(counter, nmi, regs, addr))
+        if (perf_counter_overflow(counter, nmi, &data))
                 /* soft-disable the counter */
                 ;