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Subject[PATCH] perf_counter: remove the event config bitfields
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On Sat, 2009-03-21 at 12:41 +0100, Peter Zijlstra wrote:
> On Sat, 2009-03-21 at 10:56 +0100, Ingo Molnar wrote:
>
> > Maybe the best option is to get rid of the bitfields and use masks
>
> Yeah, I think that'll be sanest..

Paul, I noticed you assign the raw config without mask, is that ok?

---
Subject: perf_counter: remove the event config bitfields

Since the bitfields turned into a bit of a mess, remove them and rely on
good old masks.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
diff --git a/arch/powerpc/kernel/perf_counter.c b/arch/powerpc/kernel/perf_counter.c
index 6413d9c..d056515 100644
--- a/arch/powerpc/kernel/perf_counter.c
+++ b/arch/powerpc/kernel/perf_counter.c
@@ -602,13 +602,13 @@ hw_perf_counter_init(struct perf_counter *counter)
return NULL;
if ((s64)counter->hw_event.irq_period < 0)
return NULL;
- if (!counter->hw_event.raw_type) {
- ev = counter->hw_event.event_id;
+ if (!perf_event_raw(&counter->hw_event)) {
+ ev = perf_event_id(&counter->hw_event);
if (ev >= ppmu->n_generic || ppmu->generic_events[ev] == 0)
return NULL;
ev = ppmu->generic_events[ev];
} else {
- ev = counter->hw_event.raw_event_id;
+ ev = perf_event_config(&counter->hw_event);
}
counter->hw.config_base = ev;
counter->hw.idx = 0;
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 902282d..3f95b0c 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -217,15 +217,15 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
/*
* Raw event type provide the config in the event structure
*/
- if (hw_event->raw_type) {
- hwc->config |= pmc_ops->raw_event(hw_event->raw_event_id);
+ if (perf_event_raw(hw_event)) {
+ hwc->config |= pmc_ops->raw_event(perf_event_config(hw_event));
} else {
- if (hw_event->event_id >= pmc_ops->max_events)
+ if (perf_event_id(hw_event) >= pmc_ops->max_events)
return -EINVAL;
/*
* The generic map:
*/
- hwc->config |= pmc_ops->event_map(hw_event->event_id);
+ hwc->config |= pmc_ops->event_map(perf_event_id(hw_event));
}
counter->wakeup_pending = 0;

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 98f5990..4d0d787 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -82,32 +82,22 @@ enum perf_counter_record_type {
PERF_RECORD_GROUP = 2,
};

+#define PERF_COUNTER_RAW_MASK 0x8000000000000000ULL
+#define PERF_COUNTER_CONFIG_MASK 0x7FFFFFFFFFFFFFFFULL
+#define PERF_COUNTER_TYPE_MASK 0x7F00000000000000ULL
+#define PERF_COUNTER_EVENT_MASK 0x00FFFFFFFFFFFFFFULL
+
/*
* Hardware event to monitor via a performance monitoring counter:
*/
struct perf_counter_hw_event {
- union {
-#ifndef __BIG_ENDIAN_BITFIELD
- struct {
- __u64 event_id : 56,
- type : 8;
- };
- struct {
- __u64 raw_event_id : 63,
- raw_type : 1;
- };
-#else
- struct {
- __u64 type : 8,
- event_id : 56;
- };
- struct {
- __u64 raw_type : 1,
- raw_event_id : 63;
- };
-#endif /* __BIT_ENDIAN_BITFIELD */
- __u64 event_config;
- };
+ /*
+ * The MSB of the config word signifies if the rest contains cpu
+ * specific (raw) counter configuration data, if unset, the next
+ * 7 bits are an event type and the rest of the bits are the event
+ * identifier.
+ */
+ __u64 config;

__u64 irq_period;
__u64 record_type;
@@ -157,6 +147,26 @@ struct perf_counter_hw_event {

struct task_struct;

+static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
+{
+ return hw_event->config & PERF_COUNTER_RAW_MASK;
+}
+
+static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
+{
+ return hw_event->config & PERF_COUNTER_CONFIG_MASK;
+}
+
+static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
+{
+ return (hw_event->config & PERF_COUNTER_TYPE_MASK) >> 56;
+}
+
+static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
+{
+ return hw_event->config & PERF_COUNTER_EVENT_MASK;
+}
+
/**
* struct hw_perf_counter - performance counter hardware details:
*/
@@ -336,8 +346,8 @@ extern void perf_counter_output(struct perf_counter *counter,
*/
static inline int is_software_counter(struct perf_counter *counter)
{
- return !counter->hw_event.raw_type &&
- counter->hw_event.type != PERF_TYPE_HARDWARE;
+ return !perf_event_raw(&counter->hw_event) &&
+ perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
}

extern void perf_swcounter_event(u32, u64, int, struct pt_regs *);
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index f054b8c..bbd538a 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1379,7 +1379,7 @@ static void perf_counter_handle_group(struct perf_counter *counter)
list_for_each_entry(sub, &leader->sibling_list, list_entry) {
if (sub != counter)
sub->hw_ops->read(sub);
- perf_counter_store_irq(counter, sub->hw_event.event_config);
+ perf_counter_store_irq(counter, sub->hw_event.config);
perf_counter_store_irq(counter, atomic64_read(&sub->count));
}
}
@@ -1489,13 +1489,13 @@ static int perf_swcounter_match(struct perf_counter *counter,
if (counter->state != PERF_COUNTER_STATE_ACTIVE)
return 0;

- if (counter->hw_event.raw_type)
+ if (perf_event_raw(&counter->hw_event))
return 0;

- if (counter->hw_event.type != type)
+ if (perf_event_type(&counter->hw_event) != type)
return 0;

- if (counter->hw_event.event_id != event)
+ if (perf_event_id(&counter->hw_event) != event)
return 0;

if (counter->hw_event.exclude_user && user_mode(regs))
@@ -1763,7 +1763,7 @@ static void tp_perf_counter_destroy(struct perf_counter *counter)
static const struct hw_perf_counter_ops *
tp_perf_counter_init(struct perf_counter *counter)
{
- int event_id = counter->hw_event.event_id;
+ int event_id = perf_event_id(&counter->hw_event);
int ret;

ret = ftrace_profile_enable(event_id);
@@ -1797,7 +1797,7 @@ sw_perf_counter_init(struct perf_counter *counter)
* to be kernel events, and page faults are never hypervisor
* events.
*/
- switch (counter->hw_event.event_id) {
+ switch (perf_event_id(&counter->hw_event)) {
case PERF_COUNT_CPU_CLOCK:
hw_ops = &perf_ops_cpu_clock;

@@ -1882,9 +1882,12 @@ perf_counter_alloc(struct perf_counter_hw_event *hw_event,

hw_ops = NULL;

- if (hw_event->raw_type)
+ if (perf_event_raw(hw_event)) {
hw_ops = hw_perf_counter_init(counter);
- else switch (hw_event->type) {
+ goto done;
+ }
+
+ switch (perf_event_type(hw_event)) {
case PERF_TYPE_HARDWARE:
hw_ops = hw_perf_counter_init(counter);
break;
@@ -1902,6 +1905,7 @@ perf_counter_alloc(struct perf_counter_hw_event *hw_event,
kfree(counter);
return NULL;
}
+done:
counter->hw_ops = hw_ops;

return counter;



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