perf: Add sysfs entry to adjust multiplexing interval per PMU

This patch adds /sys/device/xxx/perf_event_mux_interval_ms to ajust
the multiplexing interval per PMU. The unit is milliseconds. Value has
to be >= 1.

In the 4th version, we renamed the sysfs file to be more consistent
with the other /proc/sys/kernel entries for perf_events.

In the 5th version, we handle the reprogramming of the hrtimer using
hrtimer_forward_now(). That way, we sync up to new timer value quickly
(suggested by Jiri Olsa).

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/r/1364991694-5876-3-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 59 insertions, 4 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 97bfac7e6f45..53d1b300116a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -723,13 +723,21 @@ static void __perf_cpu_hrtimer_init(struct perf_cpu_context *cpuctx, int cpu)
 {
         struct hrtimer *hr = &cpuctx->hrtimer;
         struct pmu *pmu = cpuctx->ctx.pmu;
+        int timer;
 
         /* no multiplexing needed for SW PMU */
         if (pmu->task_ctx_nr == perf_sw_context)
                 return;
 
-        cpuctx->hrtimer_interval =
-                ns_to_ktime(NSEC_PER_MSEC * PERF_CPU_HRTIMER);
+        /*
+         * check default is sane, if not set then force to
+         * default interval (1/tick)
+         */
+        timer = pmu->hrtimer_interval_ms;
+        if (timer < 1)
+                timer = pmu->hrtimer_interval_ms = PERF_CPU_HRTIMER;
+
+        cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * timer);
 
         hrtimer_init(hr, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
         hr->function = perf_cpu_hrtimer_handler;
@@ -6001,9 +6009,56 @@ type_show(struct device *dev, struct device_attribute *attr, char *page)
         return snprintf(page, PAGE_SIZE-1, "%d\n", pmu->type);
 }
 
+static ssize_t
+perf_event_mux_interval_ms_show(struct device *dev,
+                                struct device_attribute *attr,
+                                char *page)
+{
+        struct pmu *pmu = dev_get_drvdata(dev);
+
+        return snprintf(page, PAGE_SIZE-1, "%d\n", pmu->hrtimer_interval_ms);
+}
+
+static ssize_t
+perf_event_mux_interval_ms_store(struct device *dev,
+                                 struct device_attribute *attr,
+                                 const char *buf, size_t count)
+{
+        struct pmu *pmu = dev_get_drvdata(dev);
+        int timer, cpu, ret;
+
+        ret = kstrtoint(buf, 0, &timer);
+        if (ret)
+                return ret;
+
+        if (timer < 1)
+                return -EINVAL;
+
+        /* same value, noting to do */
+        if (timer == pmu->hrtimer_interval_ms)
+                return count;
+
+        pmu->hrtimer_interval_ms = timer;
+
+        /* update all cpuctx for this PMU */
+        for_each_possible_cpu(cpu) {
+                struct perf_cpu_context *cpuctx;
+                cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
+                cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * timer);
+
+                if (hrtimer_active(&cpuctx->hrtimer))
+                        hrtimer_forward_now(&cpuctx->hrtimer, cpuctx->hrtimer_interval);
+        }
+
+        return count;
+}
+
+#define __ATTR_RW(attr) __ATTR(attr, 0644, attr##_show, attr##_store)
+
 static struct device_attribute pmu_dev_attrs[] = {
-       __ATTR_RO(type),
-       __ATTR_NULL,
+        __ATTR_RO(type),
+        __ATTR_RW(perf_event_mux_interval_ms),
+        __ATTR_NULL,
 };
 
 static int pmu_bus_running;