[tip:perfcounters/core] perf_counter: Push perf_sample_data through the swcounter code

tip-bot for Peter Zijlstra
2009-06-20T11:28:23Z

Commit-ID: 92bf309a9cd5fedd6c8eefbce0b9a95ada82d0a9
Gitweb: http://git.kernel.org/tip/92bf309a9cd5fedd6c8eefbce0b9a95ada82d0a9
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Fri, 19 Jun 2009 18:11:53 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Sat, 20 Jun 2009 12:30:30 +0200

perf_counter: Push perf_sample_data through the swcounter code

Push the perf_sample_data further outwards to the swcounter interface,
to abstract it away some more.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

---
kernel/perf_counter.c | 55 +++++++++++++++++++++++++-----------------------
1 files changed, 29 insertions(+), 26 deletions(-)

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index adb6ae5..1a933a2 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -3171,20 +3171,15 @@ 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)
+ int nmi, struct perf_sample_data *data)
{
- struct perf_sample_data data = {
- .regs = regs,
- .addr = addr,
- .period = counter->hw.last_period,
- };
+ data->period = counter->hw.last_period;

perf_swcounter_update(counter);
perf_swcounter_set_period(counter);
- if (perf_counter_overflow(counter, nmi, &data))
+ if (perf_counter_overflow(counter, nmi, data))
/* soft-disable the counter */
;
-
}

static int perf_swcounter_is_counting(struct perf_counter *counter)
@@ -3249,18 +3244,18 @@ static int perf_swcounter_match(struct perf_counter *counter,
}

static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
- int nmi, struct pt_regs *regs, u64 addr)
+ int nmi, struct perf_sample_data *data)
{
int neg = atomic64_add_negative(nr, &counter->hw.count);

- if (counter->hw.sample_period && !neg && regs)
- perf_swcounter_overflow(counter, nmi, regs, addr);
+ if (counter->hw.sample_period && !neg && data->regs)
+ perf_swcounter_overflow(counter, nmi, data);
}

static void perf_swcounter_ctx_event(struct perf_counter_context *ctx,
- enum perf_type_id type, u32 event,
- u64 nr, int nmi, struct pt_regs *regs,
- u64 addr)
+ enum perf_type_id type,
+ u32 event, u64 nr, int nmi,
+ struct perf_sample_data *data)
{
struct perf_counter *counter;

@@ -3269,8 +3264,8 @@ static void perf_swcounter_ctx_event(struct perf_counter_context *ctx,

rcu_read_lock();
list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
- if (perf_swcounter_match(counter, type, event, regs))
- perf_swcounter_add(counter, nr, nmi, regs, addr);
+ if (perf_swcounter_match(counter, type, event, data->regs))
+ perf_swcounter_add(counter, nr, nmi, data);
}
rcu_read_unlock();
}
@@ -3289,9 +3284,9 @@ static int *perf_swcounter_recursion_context(struct perf_cpu_context *cpuctx)
return &cpuctx->recursion[0];
}

-static void __perf_swcounter_event(enum perf_type_id type, u32 event,
- u64 nr, int nmi, struct pt_regs *regs,
- u64 addr)
+static void do_perf_swcounter_event(enum perf_type_id type, u32 event,
+ u64 nr, int nmi,
+ struct perf_sample_data *data)
{
struct perf_cpu_context *cpuctx = &get_cpu_var(perf_cpu_context);
int *recursion = perf_swcounter_recursion_context(cpuctx);
@@ -3304,7 +3299,7 @@ static void __perf_swcounter_event(enum perf_type_id type, u32 event,
barrier();

perf_swcounter_ctx_event(&cpuctx->ctx, type, event,
- nr, nmi, regs, addr);
+ nr, nmi, data);
rcu_read_lock();
/*
* doesn't really matter which of the child contexts the
@@ -3312,7 +3307,7 @@ static void __perf_swcounter_event(enum perf_type_id type, u32 event,
*/
ctx = rcu_dereference(current->perf_counter_ctxp);
if (ctx)
- perf_swcounter_ctx_event(ctx, type, event, nr, nmi, regs, addr);
+ perf_swcounter_ctx_event(ctx, type, event, nr, nmi, data);
rcu_read_unlock();

barrier();
@@ -3325,7 +3320,12 @@ out:
void
perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
{
- __perf_swcounter_event(PERF_TYPE_SOFTWARE, event, nr, nmi, regs, addr);
+ struct perf_sample_data data = {
+ .regs = regs,
+ .addr = addr,
+ };
+
+ do_perf_swcounter_event(PERF_TYPE_SOFTWARE, event, nr, nmi, &data);
}

static void perf_swcounter_read(struct perf_counter *counter)
@@ -3469,12 +3469,15 @@ static const struct pmu perf_ops_task_clock = {
#ifdef CONFIG_EVENT_PROFILE
void perf_tpcounter_event(int event_id)
{
- struct pt_regs *regs = get_irq_regs();
+ struct perf_sample_data data = {
+ .regs = get_irq_regs();
+ .addr = 0,
+ };

- if (!regs)
- regs = task_pt_regs(current);
+ if (!data.regs)
+ data.regs = task_pt_regs(current);

- __perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, 1, 1, regs, 0);
+ do_perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, 1, 1, &data);
}
EXPORT_SYMBOL_GPL(perf_tpcounter_event);