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authorJason Yeh <jason.yeh@amd.com>2009-07-08 13:49:38 +0200
committerRobert Richter <robert.richter@amd.com>2009-07-20 16:33:53 +0200
commit4d4036e0e7299c6cbb2d2421b4b30b7a409ce61a (patch)
treec9003cd927ed878412e89a59db0138b6b701b629 /drivers/oprofile/oprof.c
parent6e63ea4b0b14ff5fb8a3ca704fcda7d28b95f079 (diff)
oprofile: Implement performance counter multiplexing
The number of hardware counters is limited. The multiplexing feature enables OProfile to gather more events than counters are provided by the hardware. This is realized by switching between events at an user specified time interval. A new file (/dev/oprofile/time_slice) is added for the user to specify the timer interval in ms. If the number of events to profile is higher than the number of hardware counters available, the patch will schedule a work queue that switches the event counter and re-writes the different sets of values into it. The switching mechanism needs to be implemented for each architecture to support multiplexing. This patch only implements AMD CPU support, but multiplexing can be easily extended for other models and architectures. There are follow-on patches that rework parts of this patch. Signed-off-by: Jason Yeh <jason.yeh@amd.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'drivers/oprofile/oprof.c')
-rw-r--r--drivers/oprofile/oprof.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
index 3cffce90f82..7bc64af7cf9 100644
--- a/drivers/oprofile/oprof.c
+++ b/drivers/oprofile/oprof.c
@@ -12,6 +12,8 @@
#include <linux/init.h>
#include <linux/oprofile.h>
#include <linux/moduleparam.h>
+#include <linux/workqueue.h>
+#include <linux/time.h>
#include <asm/mutex.h>
#include "oprof.h"
@@ -27,6 +29,15 @@ unsigned long oprofile_backtrace_depth;
static unsigned long is_setup;
static DEFINE_MUTEX(start_mutex);
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+
+static void switch_worker(struct work_struct *work);
+static DECLARE_DELAYED_WORK(switch_work, switch_worker);
+unsigned long timeout_jiffies;
+#define MULTIPLEXING_TIMER_DEFAULT 1
+
+#endif
+
/* timer
0 - use performance monitoring hardware if available
1 - use the timer int mechanism regardless
@@ -87,6 +98,20 @@ out:
return err;
}
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+
+static void start_switch_worker(void)
+{
+ schedule_delayed_work(&switch_work, timeout_jiffies);
+}
+
+static void switch_worker(struct work_struct *work)
+{
+ if (!oprofile_ops.switch_events())
+ start_switch_worker();
+}
+
+#endif
/* Actually start profiling (echo 1>/dev/oprofile/enable) */
int oprofile_start(void)
@@ -108,6 +133,11 @@ int oprofile_start(void)
if ((err = oprofile_ops.start()))
goto out;
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+ if (oprofile_ops.switch_events)
+ start_switch_worker();
+#endif
+
oprofile_started = 1;
out:
mutex_unlock(&start_mutex);
@@ -123,6 +153,11 @@ void oprofile_stop(void)
goto out;
oprofile_ops.stop();
oprofile_started = 0;
+
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+ cancel_delayed_work_sync(&switch_work);
+#endif
+
/* wake up the daemon to read what remains */
wake_up_buffer_waiter();
out:
@@ -155,6 +190,36 @@ post_sync:
mutex_unlock(&start_mutex);
}
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+
+/* User inputs in ms, converts to jiffies */
+int oprofile_set_timeout(unsigned long val_msec)
+{
+ int err = 0;
+
+ mutex_lock(&start_mutex);
+
+ if (oprofile_started) {
+ err = -EBUSY;
+ goto out;
+ }
+
+ if (!oprofile_ops.switch_events) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ timeout_jiffies = msecs_to_jiffies(val_msec);
+ if (timeout_jiffies == MAX_JIFFY_OFFSET)
+ timeout_jiffies = msecs_to_jiffies(MULTIPLEXING_TIMER_DEFAULT);
+
+out:
+ mutex_unlock(&start_mutex);
+ return err;
+
+}
+
+#endif
int oprofile_set_backtrace(unsigned long val)
{
@@ -179,10 +244,23 @@ out:
return err;
}
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+
+static void __init oprofile_multiplexing_init(void)
+{
+ timeout_jiffies = msecs_to_jiffies(MULTIPLEXING_TIMER_DEFAULT);
+}
+
+#endif
+
static int __init oprofile_init(void)
{
int err;
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+ oprofile_multiplexing_init();
+#endif
+
err = oprofile_arch_init(&oprofile_ops);
if (err < 0 || timer) {