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Diffstat (limited to 'kernel/events/core.c')
-rw-r--r--kernel/events/core.c99
1 files changed, 67 insertions, 32 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index fc9bb2225291..7c0d263f6bc5 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1475,8 +1475,7 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
if (event->group_leader == event) {
struct list_head *list;
- if (is_software_event(event))
- event->group_flags |= PERF_GROUP_SOFTWARE;
+ event->group_caps = event->event_caps;
list = ctx_group_list(event, ctx);
list_add_tail(&event->group_entry, list);
@@ -1630,9 +1629,7 @@ static void perf_group_attach(struct perf_event *event)
WARN_ON_ONCE(group_leader->ctx != event->ctx);
- if (group_leader->group_flags & PERF_GROUP_SOFTWARE &&
- !is_software_event(event))
- group_leader->group_flags &= ~PERF_GROUP_SOFTWARE;
+ group_leader->group_caps &= event->event_caps;
list_add_tail(&event->group_entry, &group_leader->sibling_list);
group_leader->nr_siblings++;
@@ -1723,7 +1720,7 @@ static void perf_group_detach(struct perf_event *event)
sibling->group_leader = sibling;
/* Inherit group flags from the previous leader */
- sibling->group_flags = event->group_flags;
+ sibling->group_caps = event->group_caps;
WARN_ON_ONCE(sibling->ctx != event->ctx);
}
@@ -1832,6 +1829,8 @@ group_sched_out(struct perf_event *group_event,
struct perf_event *event;
int state = group_event->state;
+ perf_pmu_disable(ctx->pmu);
+
event_sched_out(group_event, cpuctx, ctx);
/*
@@ -1840,6 +1839,8 @@ group_sched_out(struct perf_event *group_event,
list_for_each_entry(event, &group_event->sibling_list, group_entry)
event_sched_out(event, cpuctx, ctx);
+ perf_pmu_enable(ctx->pmu);
+
if (state == PERF_EVENT_STATE_ACTIVE && group_event->attr.exclusive)
cpuctx->exclusive = 0;
}
@@ -2145,7 +2146,7 @@ static int group_can_go_on(struct perf_event *event,
/*
* Groups consisting entirely of software events can always go on.
*/
- if (event->group_flags & PERF_GROUP_SOFTWARE)
+ if (event->group_caps & PERF_EV_CAP_SOFTWARE)
return 1;
/*
* If an exclusive group is already on, no other hardware
@@ -2491,7 +2492,7 @@ static int __perf_event_stop(void *info)
* while restarting.
*/
if (sd->restart)
- event->pmu->start(event, PERF_EF_START);
+ event->pmu->start(event, 0);
return 0;
}
@@ -2837,19 +2838,36 @@ unlock:
}
}
+static DEFINE_PER_CPU(struct list_head, sched_cb_list);
+
void perf_sched_cb_dec(struct pmu *pmu)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+
this_cpu_dec(perf_sched_cb_usages);
+
+ if (!--cpuctx->sched_cb_usage)
+ list_del(&cpuctx->sched_cb_entry);
}
+
void perf_sched_cb_inc(struct pmu *pmu)
{
+ struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+
+ if (!cpuctx->sched_cb_usage++)
+ list_add(&cpuctx->sched_cb_entry, this_cpu_ptr(&sched_cb_list));
+
this_cpu_inc(perf_sched_cb_usages);
}
/*
* This function provides the context switch callback to the lower code
* layer. It is invoked ONLY when the context switch callback is enabled.
+ *
+ * This callback is relevant even to per-cpu events; for example multi event
+ * PEBS requires this to provide PID/TID information. This requires we flush
+ * all queued PEBS records before we context switch to a new task.
*/
static void perf_pmu_sched_task(struct task_struct *prev,
struct task_struct *next,
@@ -2857,34 +2875,24 @@ static void perf_pmu_sched_task(struct task_struct *prev,
{
struct perf_cpu_context *cpuctx;
struct pmu *pmu;
- unsigned long flags;
if (prev == next)
return;
- local_irq_save(flags);
-
- rcu_read_lock();
-
- list_for_each_entry_rcu(pmu, &pmus, entry) {
- if (pmu->sched_task) {
- cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
-
- perf_ctx_lock(cpuctx, cpuctx->task_ctx);
+ list_for_each_entry(cpuctx, this_cpu_ptr(&sched_cb_list), sched_cb_entry) {
+ pmu = cpuctx->unique_pmu; /* software PMUs will not have sched_task */
- perf_pmu_disable(pmu);
+ if (WARN_ON_ONCE(!pmu->sched_task))
+ continue;
- pmu->sched_task(cpuctx->task_ctx, sched_in);
+ perf_ctx_lock(cpuctx, cpuctx->task_ctx);
+ perf_pmu_disable(pmu);
- perf_pmu_enable(pmu);
+ pmu->sched_task(cpuctx->task_ctx, sched_in);
- perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
- }
+ perf_pmu_enable(pmu);
+ perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
}
-
- rcu_read_unlock();
-
- local_irq_restore(flags);
}
static void perf_event_switch(struct task_struct *task,
@@ -3416,6 +3424,22 @@ struct perf_read_data {
int ret;
};
+static int find_cpu_to_read(struct perf_event *event, int local_cpu)
+{
+ int event_cpu = event->oncpu;
+ u16 local_pkg, event_pkg;
+
+ if (event->group_caps & PERF_EV_CAP_READ_ACTIVE_PKG) {
+ event_pkg = topology_physical_package_id(event_cpu);
+ local_pkg = topology_physical_package_id(local_cpu);
+
+ if (event_pkg == local_pkg)
+ return local_cpu;
+ }
+
+ return event_cpu;
+}
+
/*
* Cross CPU call to read the hardware event
*/
@@ -3537,7 +3561,7 @@ u64 perf_event_read_local(struct perf_event *event)
static int perf_event_read(struct perf_event *event, bool group)
{
- int ret = 0;
+ int ret = 0, cpu_to_read, local_cpu;
/*
* If event is enabled and currently active on a CPU, update the
@@ -3549,6 +3573,11 @@ static int perf_event_read(struct perf_event *event, bool group)
.group = group,
.ret = 0,
};
+
+ local_cpu = get_cpu();
+ cpu_to_read = find_cpu_to_read(event, local_cpu);
+ put_cpu();
+
/*
* Purposely ignore the smp_call_function_single() return
* value.
@@ -3559,7 +3588,7 @@ static int perf_event_read(struct perf_event *event, bool group)
* Therefore, either way, we'll have an up-to-date event count
* after this.
*/
- (void)smp_call_function_single(event->oncpu, __perf_event_read, &data, 1);
+ (void)smp_call_function_single(cpu_to_read, __perf_event_read, &data, 1);
ret = data.ret;
} else if (event->state == PERF_EVENT_STATE_INACTIVE) {
struct perf_event_context *ctx = event->ctx;
@@ -5350,9 +5379,10 @@ perf_output_sample_regs(struct perf_output_handle *handle,
struct pt_regs *regs, u64 mask)
{
int bit;
+ DECLARE_BITMAP(_mask, 64);
- for_each_set_bit(bit, (const unsigned long *) &mask,
- sizeof(mask) * BITS_PER_BYTE) {
+ bitmap_from_u64(_mask, mask);
+ for_each_set_bit(bit, _mask, sizeof(mask) * BITS_PER_BYTE) {
u64 val;
val = perf_reg_value(regs, bit);
@@ -9505,6 +9535,9 @@ SYSCALL_DEFINE5(perf_event_open,
goto err_alloc;
}
+ if (pmu->task_ctx_nr == perf_sw_context)
+ event->event_caps |= PERF_EV_CAP_SOFTWARE;
+
if (group_leader &&
(is_software_event(event) != is_software_event(group_leader))) {
if (is_software_event(event)) {
@@ -9518,7 +9551,7 @@ SYSCALL_DEFINE5(perf_event_open,
*/
pmu = group_leader->pmu;
} else if (is_software_event(group_leader) &&
- (group_leader->group_flags & PERF_GROUP_SOFTWARE)) {
+ (group_leader->group_caps & PERF_EV_CAP_SOFTWARE)) {
/*
* In case the group is a pure software group, and we
* try to add a hardware event, move the whole group to
@@ -10453,6 +10486,8 @@ static void __init perf_event_init_all_cpus(void)
INIT_LIST_HEAD(&per_cpu(pmu_sb_events.list, cpu));
raw_spin_lock_init(&per_cpu(pmu_sb_events.lock, cpu));
+
+ INIT_LIST_HEAD(&per_cpu(sched_cb_list, cpu));
}
}
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-28 17:41:05 +0000