mirror/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

Browse Source 
* 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  perf_counter: Report the cloning task as parent on perf_counter_fork()
  perf_counter: Fix an ipi-deadlock
  perf: Rework/fix the whole read vs group stuff
  perf_counter: Fix swcounter context invariance
  perf report: Don't show unresolved DSOs and symbols when -S/-d is used
  perf tools: Add a general option to enable raw sample records
  perf tools: Add a per tracepoint counter attribute to get raw sample
  perf_counter: Provide hw_perf_counter_setup_online() APIs
  perf list: Fix large list output by using the pager
  perf_counter, x86: Fix/improve apic fallback
  perf record: Add missing -C option support for specifying profile cpu
  perf tools: Fix dso__new handle() to handle deleted DSOs
  perf tools: Fix fallback to cplus_demangle() when bfd_demangle() is not available
  perf report: Show the tid too in -D
  perf record: Fix .tid and .pid fill-in when synthesizing events
  perf_counter, x86: Fix generic cache events on P6-mobile CPUs
  perf_counter, x86: Fix lapic printk message
This commit is contained in:
Linus Torvalds
2009-08-13 12:24:33 -07:00
parent 919aa96a9c 94d5d1b2d8
commit 3493e84de6
11 changed files with 429 additions and 190 deletions
Download Patch File Download Diff File Expand all files Collapse all files

338
kernel/perf_counter.c
View File

@@ -88,6 +88,7 @@ void __weak hw_perf_disable(void) { barrier(); }
void __weak hw_perf_enable(void) { barrier(); }
void __weak hw_perf_counter_setup(int cpu) { barrier(); }
void __weak hw_perf_counter_setup_online(int cpu) { barrier(); }
int __weak
hw_perf_group_sched_in(struct perf_counter *group_leader,
@@ -306,6 +307,10 @@ counter_sched_out(struct perf_counter *counter,
return;
counter->state = PERF_COUNTER_STATE_INACTIVE;
if (counter->pending_disable) {
counter->pending_disable = 0;
counter->state = PERF_COUNTER_STATE_OFF;
}
counter->tstamp_stopped = ctx->time;
counter->pmu->disable(counter);
counter->oncpu = -1;
@@ -1691,7 +1696,32 @@ static int perf_release(struct inode *inode, struct file *file)
return 0;
}
static u64 perf_counter_read_tree(struct perf_counter *counter)
static int perf_counter_read_size(struct perf_counter *counter)
{
int entry = sizeof(u64); /* value */
int size = 0;
int nr = 1;
if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
size += sizeof(u64);
if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
size += sizeof(u64);
if (counter->attr.read_format & PERF_FORMAT_ID)
entry += sizeof(u64);
if (counter->attr.read_format & PERF_FORMAT_GROUP) {
nr += counter->group_leader->nr_siblings;
size += sizeof(u64);
}
size += entry * nr;
return size;
}
static u64 perf_counter_read_value(struct perf_counter *counter)
{
struct perf_counter *child;
u64 total = 0;
@@ -1703,14 +1733,96 @@ static u64 perf_counter_read_tree(struct perf_counter *counter)
return total;
}
static int perf_counter_read_entry(struct perf_counter *counter,
u64 read_format, char __user *buf)
{
int n = 0, count = 0;
u64 values[2];
values[n++] = perf_counter_read_value(counter);
if (read_format & PERF_FORMAT_ID)
values[n++] = primary_counter_id(counter);
count = n * sizeof(u64);
if (copy_to_user(buf, values, count))
return -EFAULT;
return count;
}
static int perf_counter_read_group(struct perf_counter *counter,
u64 read_format, char __user *buf)
{
struct perf_counter *leader = counter->group_leader, *sub;
int n = 0, size = 0, err = -EFAULT;
u64 values[3];
values[n++] = 1 + leader->nr_siblings;
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
values[n++] = leader->total_time_enabled +
atomic64_read(&leader->child_total_time_enabled);
}
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
values[n++] = leader->total_time_running +
atomic64_read(&leader->child_total_time_running);
}
size = n * sizeof(u64);
if (copy_to_user(buf, values, size))
return -EFAULT;
err = perf_counter_read_entry(leader, read_format, buf + size);
if (err < 0)
return err;
size += err;
list_for_each_entry(sub, &leader->sibling_list, list_entry) {
err = perf_counter_read_entry(counter, read_format,
buf + size);
if (err < 0)
return err;
size += err;
}
return size;
}
static int perf_counter_read_one(struct perf_counter *counter,
u64 read_format, char __user *buf)
{
u64 values[4];
int n = 0;
values[n++] = perf_counter_read_value(counter);
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
values[n++] = counter->total_time_enabled +
atomic64_read(&counter->child_total_time_enabled);
}
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
values[n++] = counter->total_time_running +
atomic64_read(&counter->child_total_time_running);
}
if (read_format & PERF_FORMAT_ID)
values[n++] = primary_counter_id(counter);
if (copy_to_user(buf, values, n * sizeof(u64)))
return -EFAULT;
return n * sizeof(u64);
}
/*
* Read the performance counter - simple non blocking version for now
*/
static ssize_t
perf_read_hw(struct perf_counter *counter, char __user *buf, size_t count)
{
u64 values[4];
int n;
u64 read_format = counter->attr.read_format;
int ret;
/*
* Return end-of-file for a read on a counter that is in
@@ -1720,28 +1832,18 @@ perf_read_hw(struct perf_counter *counter, char __user *buf, size_t count)
if (counter->state == PERF_COUNTER_STATE_ERROR)
return 0;
if (count < perf_counter_read_size(counter))
return -ENOSPC;
WARN_ON_ONCE(counter->ctx->parent_ctx);
mutex_lock(&counter->child_mutex);
values[0] = perf_counter_read_tree(counter);
n = 1;
if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
values[n++] = counter->total_time_enabled +
atomic64_read(&counter->child_total_time_enabled);
if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
values[n++] = counter->total_time_running +
atomic64_read(&counter->child_total_time_running);
if (counter->attr.read_format & PERF_FORMAT_ID)
values[n++] = primary_counter_id(counter);
if (read_format & PERF_FORMAT_GROUP)
ret = perf_counter_read_group(counter, read_format, buf);
else
ret = perf_counter_read_one(counter, read_format, buf);
mutex_unlock(&counter->child_mutex);
if (count < n * sizeof(u64))
return -EINVAL;
count = n * sizeof(u64);
if (copy_to_user(buf, values, count))
return -EFAULT;
return count;
return ret;
}
static ssize_t
@@ -2245,7 +2347,7 @@ static void perf_pending_counter(struct perf_pending_entry *entry)
if (counter->pending_disable) {
counter->pending_disable = 0;
perf_counter_disable(counter);
__perf_counter_disable(counter);
}
if (counter->pending_wakeup) {
@@ -2630,7 +2732,80 @@ 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,
static void perf_output_read_one(struct perf_output_handle *handle,
struct perf_counter *counter)
{
u64 read_format = counter->attr.read_format;
u64 values[4];
int n = 0;
values[n++] = atomic64_read(&counter->count);
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
values[n++] = counter->total_time_enabled +
atomic64_read(&counter->child_total_time_enabled);
}
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
values[n++] = counter->total_time_running +
atomic64_read(&counter->child_total_time_running);
}
if (read_format & PERF_FORMAT_ID)
values[n++] = primary_counter_id(counter);
perf_output_copy(handle, values, n * sizeof(u64));
}
/*
* XXX PERF_FORMAT_GROUP vs inherited counters seems difficult.
*/
static void perf_output_read_group(struct perf_output_handle *handle,
struct perf_counter *counter)
{
struct perf_counter *leader = counter->group_leader, *sub;
u64 read_format = counter->attr.read_format;
u64 values[5];
int n = 0;
values[n++] = 1 + leader->nr_siblings;
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
values[n++] = leader->total_time_enabled;
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
values[n++] = leader->total_time_running;
if (leader != counter)
leader->pmu->read(leader);
values[n++] = atomic64_read(&leader->count);
if (read_format & PERF_FORMAT_ID)
values[n++] = primary_counter_id(leader);
perf_output_copy(handle, values, n * sizeof(u64));
list_for_each_entry(sub, &leader->sibling_list, list_entry) {
n = 0;
if (sub != counter)
sub->pmu->read(sub);
values[n++] = atomic64_read(&sub->count);
if (read_format & PERF_FORMAT_ID)
values[n++] = primary_counter_id(sub);
perf_output_copy(handle, values, n * sizeof(u64));
}
}
static void perf_output_read(struct perf_output_handle *handle,
struct perf_counter *counter)
{
if (counter->attr.read_format & PERF_FORMAT_GROUP)
perf_output_read_group(handle, counter);
else
perf_output_read_one(handle, counter);
}
void perf_counter_output(struct perf_counter *counter, int nmi,
struct perf_sample_data *data)
{
int ret;
@@ -2641,10 +2816,6 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
struct {
u32 pid, tid;
} tid_entry;
struct {
u64 id;
u64 counter;
} group_entry;
struct perf_callchain_entry *callchain = NULL;
int callchain_size = 0;
u64 time;
@@ -2699,10 +2870,8 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
if (sample_type & PERF_SAMPLE_PERIOD)
header.size += sizeof(u64);
if (sample_type & PERF_SAMPLE_GROUP) {
header.size += sizeof(u64) +
counter->nr_siblings * sizeof(group_entry);
}
if (sample_type & PERF_SAMPLE_READ)
header.size += perf_counter_read_size(counter);
if (sample_type & PERF_SAMPLE_CALLCHAIN) {
callchain = perf_callchain(data->regs);
@@ -2759,26 +2928,8 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
if (sample_type & PERF_SAMPLE_PERIOD)
perf_output_put(&handle, data->period);
/*
* XXX PERF_SAMPLE_GROUP vs inherited counters seems difficult.
*/
if (sample_type & PERF_SAMPLE_GROUP) {
struct perf_counter *leader, *sub;
u64 nr = counter->nr_siblings;
perf_output_put(&handle, nr);
leader = counter->group_leader;
list_for_each_entry(sub, &leader->sibling_list, list_entry) {
if (sub != counter)
sub->pmu->read(sub);
group_entry.id = primary_counter_id(sub);
group_entry.counter = atomic64_read(&sub->count);
perf_output_put(&handle, group_entry);
}
}
if (sample_type & PERF_SAMPLE_READ)
perf_output_read(&handle, counter);
if (sample_type & PERF_SAMPLE_CALLCHAIN) {
if (callchain)
@@ -2817,8 +2968,6 @@ struct perf_read_event {
u32 pid;
u32 tid;
u64 value;
u64 format[3];
};
static void
@@ -2830,34 +2979,20 @@ perf_counter_read_event(struct perf_counter *counter,
.header = {
.type = PERF_EVENT_READ,
.misc = 0,
.size = sizeof(event) - sizeof(event.format),
.size = sizeof(event) + perf_counter_read_size(counter),
},
.pid = perf_counter_pid(counter, task),
.tid = perf_counter_tid(counter, task),
.value = atomic64_read(&counter->count),
};
int ret, i = 0;
if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
event.header.size += sizeof(u64);
event.format[i++] = counter->total_time_enabled;
}
if (counter->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
event.header.size += sizeof(u64);
event.format[i++] = counter->total_time_running;
}
if (counter->attr.read_format & PERF_FORMAT_ID) {
event.header.size += sizeof(u64);
event.format[i++] = primary_counter_id(counter);
}
int ret;
ret = perf_output_begin(&handle, counter, event.header.size, 0, 0);
if (ret)
return;
perf_output_copy(&handle, &event, event.header.size);
perf_output_put(&handle, event);
perf_output_read(&handle, counter);
perf_output_end(&handle);
}
@@ -2893,10 +3028,10 @@ static void perf_counter_task_output(struct perf_counter *counter,
return;
task_event->event.pid = perf_counter_pid(counter, task);
task_event->event.ppid = perf_counter_pid(counter, task->real_parent);
task_event->event.ppid = perf_counter_pid(counter, current);
task_event->event.tid = perf_counter_tid(counter, task);
task_event->event.ptid = perf_counter_tid(counter, task->real_parent);
task_event->event.ptid = perf_counter_tid(counter, current);
perf_output_put(&handle, task_event->event);
perf_output_end(&handle);
@@ -3443,40 +3578,32 @@ static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
static int perf_swcounter_is_counting(struct perf_counter *counter)
{
struct perf_counter_context *ctx;
unsigned long flags;
int count;
/*
* The counter is active, we're good!
*/
if (counter->state == PERF_COUNTER_STATE_ACTIVE)
return 1;
/*
* The counter is off/error, not counting.
*/
if (counter->state != PERF_COUNTER_STATE_INACTIVE)
return 0;
/*
* If the counter is inactive, it could be just because
* its task is scheduled out, or because it's in a group
* which could not go on the PMU. We want to count in
* the first case but not the second. If the context is
* currently active then an inactive software counter must
* be the second case. If it's not currently active then
* we need to know whether the counter was active when the
* context was last active, which we can determine by
* comparing counter->tstamp_stopped with ctx->time.
*
* We are within an RCU read-side critical section,
* which protects the existence of *ctx.
* The counter is inactive, if the context is active
* we're part of a group that didn't make it on the 'pmu',
* not counting.
*/
ctx = counter->ctx;
spin_lock_irqsave(&ctx->lock, flags);
count = 1;
/* Re-check state now we have the lock */
if (counter->state < PERF_COUNTER_STATE_INACTIVE ||
counter->ctx->is_active ||
counter->tstamp_stopped < ctx->time)
count = 0;
spin_unlock_irqrestore(&ctx->lock, flags);
return count;
if (counter->ctx->is_active)
return 0;
/*
* We're inactive and the context is too, this means the
* task is scheduled out, we're counting events that happen
* to us, like migration events.
*/
return 1;
}
static int perf_swcounter_match(struct perf_counter *counter,
@@ -3928,9 +4055,9 @@ perf_counter_alloc(struct perf_counter_attr *attr,
atomic64_set(&hwc->period_left, hwc->sample_period);
/*
* we currently do not support PERF_SAMPLE_GROUP on inherited counters
* we currently do not support PERF_FORMAT_GROUP on inherited counters
*/
if (attr->inherit && (attr->sample_type & PERF_SAMPLE_GROUP))
if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP))
goto done;
switch (attr->type) {
@@ -4592,6 +4719,11 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
perf_counter_init_cpu(cpu);
break;
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
hw_perf_counter_setup_online(cpu);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
perf_counter_exit_cpu(cpu);
@@ -4616,6 +4748,8 @@ void __init perf_counter_init(void)
{
perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_UP_PREPARE,
(void *)(long)smp_processor_id());
perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_ONLINE,
(void *)(long)smp_processor_id());
register_cpu_notifier(&perf_cpu_nb);
}