[tip:perfcounters/core] perf_counter: Introduce struct for sample data

tip-bot for Peter Zijlstra
2009-06-11T00:45:02Z

Commit-ID: df1a132bf3d3508f863336c80a27806a2ac947e0
Gitweb: http://git.kernel.org/tip/df1a132bf3d3508f863336c80a27806a2ac947e0
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Wed, 10 Jun 2009 21:02:22 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Thu, 11 Jun 2009 02:39:02 +0200

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>

---
arch/powerpc/kernel/perf_counter.c | 10 ++++++--
arch/x86/kernel/cpu/perf_counter.c | 15 ++++++++++---
include/linux/perf_counter.h | 10 +++++++-
kernel/perf_counter.c | 38 ++++++++++++++++++++---------------
4 files changed, 48 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kernel/perf_counter.c b/arch/powerpc/kernel/perf_counter.c
index 4786ad9..5e0bf39 100644
--- a/arch/powerpc/kernel/perf_counter.c
+++ b/arch/powerpc/kernel/perf_counter.c
@@ -1001,7 +1001,11 @@ static void record_and_restart(struct perf_counter *counter, long val,
* Finally record data if requested.
*/
if (record) {
- addr = 0;
+ struct perf_sample_data data = {
+ .regs = regs,
+ .addr = 0,
+ };
+
if (counter->attr.sample_type & PERF_SAMPLE_ADDR) {
/*
* The user wants a data address recorded.
@@ -1016,9 +1020,9 @@ static void record_and_restart(struct perf_counter *counter, long val,
sdsync = (ppmu->flags & PPMU_ALT_SIPR) ?
POWER6_MMCRA_SDSYNC : MMCRA_SDSYNC;
if (!(mmcra & MMCRA_SAMPLE_ENABLE) || (mmcra & sdsync))
- addr = mfspr(SPRN_SDAR);
+ data.addr = mfspr(SPRN_SDAR);
}
- if (perf_counter_overflow(counter, nmi, regs, addr)) {
+ if (perf_counter_overflow(counter, nmi, &data)) {
/*
* Interrupts are coming too fast - throttle them
* by setting the counter to 0, so it will be
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 240ca56..82a23d4 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -1173,11 +1173,14 @@ static void intel_pmu_reset(void)
*/
static int intel_pmu_handle_irq(struct pt_regs *regs)
{
+ struct perf_sample_data data;
struct cpu_hw_counters *cpuc;
- struct cpu_hw_counters;
int bit, cpu, loops;
u64 ack, status;

+ data.regs = regs;
+ data.addr = 0;
+
cpu = smp_processor_id();
cpuc = &per_cpu(cpu_hw_counters, cpu);

@@ -1210,7 +1213,7 @@ again:
if (!intel_pmu_save_and_restart(counter))
continue;

- if (perf_counter_overflow(counter, 1, regs, 0))
+ if (perf_counter_overflow(counter, 1, &data))
intel_pmu_disable_counter(&counter->hw, bit);
}

@@ -1230,12 +1233,16 @@ again:

static int amd_pmu_handle_irq(struct pt_regs *regs)
{
- int cpu, idx, handled = 0;
+ struct perf_sample_data data;
struct cpu_hw_counters *cpuc;
struct perf_counter *counter;
struct hw_perf_counter *hwc;
+ int cpu, idx, handled = 0;
u64 val;

+ data.regs = regs;
+ data.addr = 0;
+
cpu = smp_processor_id();
cpuc = &per_cpu(cpu_hw_counters, cpu);

@@ -1256,7 +1263,7 @@ static int amd_pmu_handle_irq(struct pt_regs *regs)
if (!x86_perf_counter_set_period(counter, hwc, idx))
continue;

- if (perf_counter_overflow(counter, 1, regs, 0))
+ if (perf_counter_overflow(counter, 1, &data))
amd_pmu_disable_counter(hwc, idx);
}

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 282d8cc..d8c0eb4 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -605,8 +605,14 @@ extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
struct perf_counter_context *ctx, int cpu);
extern void perf_counter_update_userpage(struct perf_counter *counter);

-extern int perf_counter_overflow(struct perf_counter *counter,
- int nmi, struct pt_regs *regs, u64 addr);
+struct perf_sample_data {
+ struct pt_regs *regs;
+ u64 addr;
+};
+
+extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
+ struct perf_sample_data *data);
+
/*
* Return 1 for a software counter, 0 for a hardware counter
*/
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index ae591a1..4fe85e8 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 */
;