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-rw-r--r--kernel/events/internal.h4
-rw-r--r--kernel/events/ring_buffer.c41
2 files changed, 28 insertions, 17 deletions
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index 79c47076700a..3aef4191798c 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -24,7 +24,7 @@ struct ring_buffer {
atomic_t poll; /* POLL_ for wakeups */
local_t head; /* write position */
- local_t nest; /* nested writers */
+ unsigned int nest; /* nested writers */
local_t events; /* event limit */
local_t wakeup; /* wakeup stamp */
local_t lost; /* nr records lost */
@@ -41,7 +41,7 @@ struct ring_buffer {
/* AUX area */
long aux_head;
- local_t aux_nest;
+ unsigned int aux_nest;
long aux_wakeup; /* last aux_watermark boundary crossed by aux_head */
unsigned long aux_pgoff;
int aux_nr_pages;
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 7a0c73e4b3eb..ffb59a4ef4ff 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -38,7 +38,12 @@ static void perf_output_get_handle(struct perf_output_handle *handle)
struct ring_buffer *rb = handle->rb;
preempt_disable();
- local_inc(&rb->nest);
+
+ /*
+ * Avoid an explicit LOAD/STORE such that architectures with memops
+ * can use them.
+ */
+ (*(volatile unsigned int *)&rb->nest)++;
handle->wakeup = local_read(&rb->wakeup);
}
@@ -46,6 +51,17 @@ static void perf_output_put_handle(struct perf_output_handle *handle)
{
struct ring_buffer *rb = handle->rb;
unsigned long head;
+ unsigned int nest;
+
+ /*
+ * If this isn't the outermost nesting, we don't have to update
+ * @rb->user_page->data_head.
+ */
+ nest = READ_ONCE(rb->nest);
+ if (nest > 1) {
+ WRITE_ONCE(rb->nest, nest - 1);
+ goto out;
+ }
again:
/*
@@ -65,15 +81,6 @@ again:
*/
/*
- * If this isn't the outermost nesting, we don't have to update
- * @rb->user_page->data_head.
- */
- if (local_read(&rb->nest) > 1) {
- local_dec(&rb->nest);
- goto out;
- }
-
- /*
* Since the mmap() consumer (userspace) can run on a different CPU:
*
* kernel user
@@ -108,7 +115,7 @@ again:
* write will (temporarily) publish a stale value.
*/
barrier();
- local_set(&rb->nest, 0);
+ WRITE_ONCE(rb->nest, 0);
/*
* Ensure we decrement @rb->nest before we validate the @rb->head.
@@ -116,7 +123,7 @@ again:
*/
barrier();
if (unlikely(head != local_read(&rb->head))) {
- local_inc(&rb->nest);
+ WRITE_ONCE(rb->nest, 1);
goto again;
}
@@ -355,6 +362,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle,
struct perf_event *output_event = event;
unsigned long aux_head, aux_tail;
struct ring_buffer *rb;
+ unsigned int nest;
if (output_event->parent)
output_event = output_event->parent;
@@ -385,13 +393,16 @@ void *perf_aux_output_begin(struct perf_output_handle *handle,
if (!refcount_inc_not_zero(&rb->aux_refcount))
goto err;
+ nest = READ_ONCE(rb->aux_nest);
/*
* Nesting is not supported for AUX area, make sure nested
* writers are caught early
*/
- if (WARN_ON_ONCE(local_xchg(&rb->aux_nest, 1)))
+ if (WARN_ON_ONCE(nest))
goto err_put;
+ WRITE_ONCE(rb->aux_nest, nest + 1);
+
aux_head = rb->aux_head;
handle->rb = rb;
@@ -419,7 +430,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle,
if (!handle->size) { /* A, matches D */
event->pending_disable = smp_processor_id();
perf_output_wakeup(handle);
- local_set(&rb->aux_nest, 0);
+ WRITE_ONCE(rb->aux_nest, 0);
goto err_put;
}
}
@@ -508,7 +519,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size)
handle->event = NULL;
- local_set(&rb->aux_nest, 0);
+ WRITE_ONCE(rb->aux_nest, 0);
/* can't be last */
rb_free_aux(rb);
ring_buffer_put(rb);