[tip:perf/core] perf: Rename perf_mmap_data to perf_buffer

tip-bot for Peter Zijlstra
2010-06-09T10:17:20Z

Commit-ID: ca5135e6b4a3cbc7e187737520fbc4b508f6f7a2
Gitweb: http://git.kernel.org/tip/ca5135e6b4a3cbc7e187737520fbc4b508f6f7a2
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Fri, 28 May 2010 19:33:23 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 9 Jun 2010 11:12:35 +0200

perf: Rename perf_mmap_data to perf_buffer

Rename to clarify code.

s/perf_mmap_data/perf_buffer/g and selective s/data/buffer/g

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
include/linux/perf_event.h | 6 +-
kernel/perf_event.c | 308 ++++++++++++++++++++++----------------------
2 files changed, 157 insertions(+), 157 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index f1b6ba0..2a0da02 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -602,7 +602,7 @@ enum perf_event_active_state {

struct file;

-struct perf_mmap_data {
+struct perf_buffer {
atomic_t refcount;
struct rcu_head rcu_head;
#ifdef CONFIG_PERF_USE_VMALLOC
@@ -727,7 +727,7 @@ struct perf_event {
atomic_t mmap_count;
int mmap_locked;
struct user_struct *mmap_user;
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;

/* poll related */
wait_queue_head_t waitq;
@@ -825,7 +825,7 @@ struct perf_cpu_context {

struct perf_output_handle {
struct perf_event *event;
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
unsigned long wakeup;
unsigned long size;
void *addr;
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 6f60920..93d5458 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1876,7 +1876,7 @@ static void free_event_rcu(struct rcu_head *head)
}

static void perf_pending_sync(struct perf_event *event);
-static void perf_mmap_data_put(struct perf_mmap_data *data);
+static void perf_buffer_put(struct perf_buffer *buffer);

static void free_event(struct perf_event *event)
{
@@ -1892,9 +1892,9 @@ static void free_event(struct perf_event *event)
atomic_dec(&nr_task_events);
}

- if (event->data) {
- perf_mmap_data_put(event->data);
- event->data = NULL;
+ if (event->buffer) {
+ perf_buffer_put(event->buffer);
+ event->buffer = NULL;
}

if (event->destroy)
@@ -2119,13 +2119,13 @@ perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
static unsigned int perf_poll(struct file *file, poll_table *wait)
{
struct perf_event *event = file->private_data;
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
unsigned int events = POLL_HUP;

rcu_read_lock();
- data = rcu_dereference(event->data);
- if (data)
- events = atomic_xchg(&data->poll, 0);
+ buffer = rcu_dereference(event->buffer);
+ if (buffer)
+ events = atomic_xchg(&buffer->poll, 0);
rcu_read_unlock();

poll_wait(file, &event->waitq, wait);
@@ -2335,14 +2335,14 @@ static int perf_event_index(struct perf_event *event)
void perf_event_update_userpage(struct perf_event *event)
{
struct perf_event_mmap_page *userpg;
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;

rcu_read_lock();
- data = rcu_dereference(event->data);
- if (!data)
+ buffer = rcu_dereference(event->buffer);
+ if (!buffer)
goto unlock;

- userpg = data->user_page;
+ userpg = buffer->user_page;

/*
* Disable preemption so as to not let the corresponding user-space
@@ -2376,15 +2376,15 @@ unlock:
*/

static struct page *
-perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
+perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff)
{
- if (pgoff > data->nr_pages)
+ if (pgoff > buffer->nr_pages)
return NULL;

if (pgoff == 0)
- return virt_to_page(data->user_page);
+ return virt_to_page(buffer->user_page);

- return virt_to_page(data->data_pages[pgoff - 1]);
+ return virt_to_page(buffer->data_pages[pgoff - 1]);
}

static void *perf_mmap_alloc_page(int cpu)
@@ -2400,42 +2400,42 @@ static void *perf_mmap_alloc_page(int cpu)
return page_address(page);
}

-static struct perf_mmap_data *
-perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
+static struct perf_buffer *
+perf_buffer_alloc(struct perf_event *event, int nr_pages)
{
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
unsigned long size;
int i;

- size = sizeof(struct perf_mmap_data);
+ size = sizeof(struct perf_buffer);
size += nr_pages * sizeof(void *);

- data = kzalloc(size, GFP_KERNEL);
- if (!data)
+ buffer = kzalloc(size, GFP_KERNEL);
+ if (!buffer)
goto fail;

- data->user_page = perf_mmap_alloc_page(event->cpu);
- if (!data->user_page)
+ buffer->user_page = perf_mmap_alloc_page(event->cpu);
+ if (!buffer->user_page)
goto fail_user_page;

for (i = 0; i < nr_pages; i++) {
- data->data_pages[i] = perf_mmap_alloc_page(event->cpu);
- if (!data->data_pages[i])
+ buffer->data_pages[i] = perf_mmap_alloc_page(event->cpu);
+ if (!buffer->data_pages[i])
goto fail_data_pages;
}

- data->nr_pages = nr_pages;
+ buffer->nr_pages = nr_pages;

- return data;
+ return buffer;

fail_data_pages:
for (i--; i >= 0; i--)
- free_page((unsigned long)data->data_pages[i]);
+ free_page((unsigned long)buffer->data_pages[i]);

- free_page((unsigned long)data->user_page);
+ free_page((unsigned long)buffer->user_page);

fail_user_page:
- kfree(data);
+ kfree(buffer);

fail:
return NULL;
@@ -2449,17 +2449,17 @@ static void perf_mmap_free_page(unsigned long addr)
__free_page(page);
}

-static void perf_mmap_data_free(struct perf_mmap_data *data)
+static void perf_buffer_free(struct perf_buffer *buffer)
{
int i;

- perf_mmap_free_page((unsigned long)data->user_page);
- for (i = 0; i < data->nr_pages; i++)
- perf_mmap_free_page((unsigned long)data->data_pages[i]);
- kfree(data);
+ perf_mmap_free_page((unsigned long)buffer->user_page);
+ for (i = 0; i < buffer->nr_pages; i++)
+ perf_mmap_free_page((unsigned long)buffer->data_pages[i]);
+ kfree(buffer);
}

-static inline int page_order(struct perf_mmap_data *data)
+static inline int page_order(struct perf_buffer *buffer)
{
return 0;
}
@@ -2472,18 +2472,18 @@ static inline int page_order(struct perf_mmap_data *data)
* Required for architectures that have d-cache aliasing issues.
*/

-static inline int page_order(struct perf_mmap_data *data)
+static inline int page_order(struct perf_buffer *buffer)
{
- return data->page_order;
+ return buffer->page_order;
}

static struct page *
-perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
+perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff)
{
- if (pgoff > (1UL << page_order(data)))
+ if (pgoff > (1UL << page_order(buffer)))
return NULL;

- return vmalloc_to_page((void *)data->user_page + pgoff * PAGE_SIZE);
+ return vmalloc_to_page((void *)buffer->user_page + pgoff * PAGE_SIZE);
}

static void perf_mmap_unmark_page(void *addr)
@@ -2493,57 +2493,57 @@ static void perf_mmap_unmark_page(void *addr)
page->mapping = NULL;
}

-static void perf_mmap_data_free_work(struct work_struct *work)
+static void perf_buffer_free_work(struct work_struct *work)
{
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
void *base;
int i, nr;

- data = container_of(work, struct perf_mmap_data, work);
- nr = 1 << page_order(data);
+ buffer = container_of(work, struct perf_buffer, work);
+ nr = 1 << page_order(buffer);

- base = data->user_page;
+ base = buffer->user_page;
for (i = 0; i < nr + 1; i++)
perf_mmap_unmark_page(base + (i * PAGE_SIZE));

vfree(base);
- kfree(data);
+ kfree(buffer);
}

-static void perf_mmap_data_free(struct perf_mmap_data *data)
+static void perf_buffer_free(struct perf_buffer *buffer)
{
- schedule_work(&data->work);
+ schedule_work(&buffer->work);
}

-static struct perf_mmap_data *
-perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
+static struct perf_buffer *
+perf_buffer_alloc(struct perf_event *event, int nr_pages)
{
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
unsigned long size;
void *all_buf;

- size = sizeof(struct perf_mmap_data);
+ size = sizeof(struct perf_buffer);
size += sizeof(void *);

- data = kzalloc(size, GFP_KERNEL);
- if (!data)
+ buffer = kzalloc(size, GFP_KERNEL);
+ if (!buffer)
goto fail;

- INIT_WORK(&data->work, perf_mmap_data_free_work);
+ INIT_WORK(&buffer->work, perf_buffer_free_work);

all_buf = vmalloc_user((nr_pages + 1) * PAGE_SIZE);
if (!all_buf)
goto fail_all_buf;

- data->user_page = all_buf;
- data->data_pages[0] = all_buf + PAGE_SIZE;
- data->page_order = ilog2(nr_pages);
- data->nr_pages = 1;
+ buffer->user_page = all_buf;
+ buffer->data_pages[0] = all_buf + PAGE_SIZE;
+ buffer->page_order = ilog2(nr_pages);
+ buffer->nr_pages = 1;

- return data;
+ return buffer;

fail_all_buf:
- kfree(data);
+ kfree(buffer);

fail:
return NULL;
@@ -2551,15 +2551,15 @@ fail:

#endif

-static unsigned long perf_data_size(struct perf_mmap_data *data)
+static unsigned long perf_data_size(struct perf_buffer *buffer)
{
- return data->nr_pages << (PAGE_SHIFT + page_order(data));
+ return buffer->nr_pages << (PAGE_SHIFT + page_order(buffer));
}

static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct perf_event *event = vma->vm_file->private_data;
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
int ret = VM_FAULT_SIGBUS;

if (vmf->flags & FAULT_FLAG_MKWRITE) {
@@ -2569,14 +2569,14 @@ static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
}

rcu_read_lock();
- data = rcu_dereference(event->data);
- if (!data)
+ buffer = rcu_dereference(event->buffer);
+ if (!buffer)
goto unlock;

if (vmf->pgoff && (vmf->flags & FAULT_FLAG_WRITE))
goto unlock;

- vmf->page = perf_mmap_to_page(data, vmf->pgoff);
+ vmf->page = perf_mmap_to_page(buffer, vmf->pgoff);
if (!vmf->page)
goto unlock;

@@ -2592,51 +2592,51 @@ unlock:
}

static void
-perf_mmap_data_init(struct perf_event *event, struct perf_mmap_data *data)
+perf_buffer_init(struct perf_event *event, struct perf_buffer *buffer)
{
- long max_size = perf_data_size(data);
+ long max_size = perf_data_size(buffer);

if (event->attr.watermark) {
- data->watermark = min_t(long, max_size,
+ buffer->watermark = min_t(long, max_size,
event->attr.wakeup_watermark);
}

- if (!data->watermark)
- data->watermark = max_size / 2;
+ if (!buffer->watermark)
+ buffer->watermark = max_size / 2;

- atomic_set(&data->refcount, 1);
- rcu_assign_pointer(event->data, data);
+ atomic_set(&buffer->refcount, 1);
+ rcu_assign_pointer(event->buffer, buffer);
}

-static void perf_mmap_data_free_rcu(struct rcu_head *rcu_head)
+static void perf_buffer_free_rcu(struct rcu_head *rcu_head)
{
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;

- data = container_of(rcu_head, struct perf_mmap_data, rcu_head);
- perf_mmap_data_free(data);
+ buffer = container_of(rcu_head, struct perf_buffer, rcu_head);
+ perf_buffer_free(buffer);
}

-static struct perf_mmap_data *perf_mmap_data_get(struct perf_event *event)
+static struct perf_buffer *perf_buffer_get(struct perf_event *event)
{
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;

rcu_read_lock();
- data = rcu_dereference(event->data);
- if (data) {
- if (!atomic_inc_not_zero(&data->refcount))
- data = NULL;
+ buffer = rcu_dereference(event->buffer);
+ if (buffer) {
+ if (!atomic_inc_not_zero(&buffer->refcount))
+ buffer = NULL;
}
rcu_read_unlock();

- return data;
+ return buffer;
}

-static void perf_mmap_data_put(struct perf_mmap_data *data)
+static void perf_buffer_put(struct perf_buffer *buffer)
{
- if (!atomic_dec_and_test(&data->refcount))
+ if (!atomic_dec_and_test(&buffer->refcount))
return;

- call_rcu(&data->rcu_head, perf_mmap_data_free_rcu);
+ call_rcu(&buffer->rcu_head, perf_buffer_free_rcu);
}

static void perf_mmap_open(struct vm_area_struct *vma)
@@ -2651,16 +2651,16 @@ static void perf_mmap_close(struct vm_area_struct *vma)
struct perf_event *event = vma->vm_file->private_data;

if (atomic_dec_and_mutex_lock(&event->mmap_count, &event->mmap_mutex)) {
- unsigned long size = perf_data_size(event->data);
+ unsigned long size = perf_data_size(event->buffer);
struct user_struct *user = event->mmap_user;
- struct perf_mmap_data *data = event->data;
+ struct perf_buffer *buffer = event->buffer;

atomic_long_sub((size >> PAGE_SHIFT) + 1, &user->locked_vm);
vma->vm_mm->locked_vm -= event->mmap_locked;
- rcu_assign_pointer(event->data, NULL);
+ rcu_assign_pointer(event->buffer, NULL);
mutex_unlock(&event->mmap_mutex);

- perf_mmap_data_put(data);
+ perf_buffer_put(buffer);
free_uid(user);
}
}
@@ -2678,7 +2678,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
unsigned long user_locked, user_lock_limit;
struct user_struct *user = current_user();
unsigned long locked, lock_limit;
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
unsigned long vma_size;
unsigned long nr_pages;
long user_extra, extra;
@@ -2699,7 +2699,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
nr_pages = (vma_size / PAGE_SIZE) - 1;

/*
- * If we have data pages ensure they're a power-of-two number, so we
+ * If we have buffer pages ensure they're a power-of-two number, so we
* can do bitmasks instead of modulo.
*/
if (nr_pages != 0 && !is_power_of_2(nr_pages))
@@ -2713,9 +2713,9 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)

WARN_ON_ONCE(event->ctx->parent_ctx);
mutex_lock(&event->mmap_mutex);
- if (event->data) {
- if (event->data->nr_pages == nr_pages)
- atomic_inc(&event->data->refcount);
+ if (event->buffer) {
+ if (event->buffer->nr_pages == nr_pages)
+ atomic_inc(&event->buffer->refcount);
else
ret = -EINVAL;
goto unlock;
@@ -2745,17 +2745,17 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
goto unlock;
}

- WARN_ON(event->data);
+ WARN_ON(event->buffer);

- data = perf_mmap_data_alloc(event, nr_pages);
- if (!data) {
+ buffer = perf_buffer_alloc(event, nr_pages);
+ if (!buffer) {
ret = -ENOMEM;
goto unlock;
}

- perf_mmap_data_init(event, data);
+ perf_buffer_init(event, buffer);
if (vma->vm_flags & VM_WRITE)
- event->data->writable = 1;
+ event->buffer->writable = 1;

atomic_long_add(user_extra, &user->locked_vm);
event->mmap_locked = extra;
@@ -2964,15 +2964,15 @@ EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks);
/*
* Output
*/
-static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,
+static bool perf_output_space(struct perf_buffer *buffer, unsigned long tail,
unsigned long offset, unsigned long head)
{
unsigned long mask;

- if (!data->writable)
+ if (!buffer->writable)
return true;

- mask = perf_data_size(data) - 1;
+ mask = perf_data_size(buffer) - 1;

offset = (offset - tail) & mask;
head = (head - tail) & mask;
@@ -2985,7 +2985,7 @@ static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,

static void perf_output_wakeup(struct perf_output_handle *handle)
{
- atomic_set(&handle->data->poll, POLL_IN);
+ atomic_set(&handle->buffer->poll, POLL_IN);

if (handle->nmi) {
handle->event->pending_wakeup = 1;
@@ -3005,45 +3005,45 @@ static void perf_output_wakeup(struct perf_output_handle *handle)
*/
static void perf_output_get_handle(struct perf_output_handle *handle)
{
- struct perf_mmap_data *data = handle->data;
+ struct perf_buffer *buffer = handle->buffer;

preempt_disable();
- local_inc(&data->nest);
- handle->wakeup = local_read(&data->wakeup);
+ local_inc(&buffer->nest);
+ handle->wakeup = local_read(&buffer->wakeup);
}

static void perf_output_put_handle(struct perf_output_handle *handle)
{
- struct perf_mmap_data *data = handle->data;
+ struct perf_buffer *buffer = handle->buffer;
unsigned long head;

again:
- head = local_read(&data->head);
+ head = local_read(&buffer->head);

/*
* IRQ/NMI can happen here, which means we can miss a head update.
*/

- if (!local_dec_and_test(&data->nest))
+ if (!local_dec_and_test(&buffer->nest))
goto out;

/*
* Publish the known good head. Rely on the full barrier implied
- * by atomic_dec_and_test() order the data->head read and this
+ * by atomic_dec_and_test() order the buffer->head read and this
* write.
*/
- data->user_page->data_head = head;
+ buffer->user_page->data_head = head;

/*
* Now check if we missed an update, rely on the (compiler)
- * barrier in atomic_dec_and_test() to re-read data->head.
+ * barrier in atomic_dec_and_test() to re-read buffer->head.
*/
- if (unlikely(head != local_read(&data->head))) {
- local_inc(&data->nest);
+ if (unlikely(head != local_read(&buffer->head))) {
+ local_inc(&buffer->nest);
goto again;
}

- if (handle->wakeup != local_read(&data->wakeup))
+ if (handle->wakeup != local_read(&buffer->wakeup))
perf_output_wakeup(handle);

out:
@@ -3063,12 +3063,12 @@ __always_inline void perf_output_copy(struct perf_output_handle *handle,
buf += size;
handle->size -= size;
if (!handle->size) {
- struct perf_mmap_data *data = handle->data;
+ struct perf_buffer *buffer = handle->buffer;

handle->page++;
- handle->page &= data->nr_pages - 1;
- handle->addr = data->data_pages[handle->page];
- handle->size = PAGE_SIZE << page_order(data);
+ handle->page &= buffer->nr_pages - 1;
+ handle->addr = buffer->data_pages[handle->page];
+ handle->size = PAGE_SIZE << page_order(buffer);
}
} while (len);
}
@@ -3077,7 +3077,7 @@ int perf_output_begin(struct perf_output_handle *handle,
struct perf_event *event, unsigned int size,
int nmi, int sample)
{
- struct perf_mmap_data *data;
+ struct perf_buffer *buffer;
unsigned long tail, offset, head;
int have_lost;
struct {
@@ -3093,19 +3093,19 @@ int perf_output_begin(struct perf_output_handle *handle,
if (event->parent)
event = event->parent;

- data = rcu_dereference(event->data);
- if (!data)
+ buffer = rcu_dereference(event->buffer);
+ if (!buffer)
goto out;

- handle->data = data;
+ handle->buffer = buffer;
handle->event = event;
handle->nmi = nmi;
handle->sample = sample;

- if (!data->nr_pages)
+ if (!buffer->nr_pages)
goto out;

- have_lost = local_read(&data->lost);
+ have_lost = local_read(&buffer->lost);
if (have_lost)
size += sizeof(lost_event);

@@ -3117,30 +3117,30 @@ int perf_output_begin(struct perf_output_handle *handle,
* tail pointer. So that all reads will be completed before the
* write is issued.
*/
- tail = ACCESS_ONCE(data->user_page->data_tail);
+ tail = ACCESS_ONCE(buffer->user_page->data_tail);
smp_rmb();
- offset = head = local_read(&data->head);
+ offset = head = local_read(&buffer->head);
head += size;
- if (unlikely(!perf_output_space(data, tail, offset, head)))
+ if (unlikely(!perf_output_space(buffer, tail, offset, head)))
goto fail;
- } while (local_cmpxchg(&data->head, offset, head) != offset);
+ } while (local_cmpxchg(&buffer->head, offset, head) != offset);

- if (head - local_read(&data->wakeup) > data->watermark)
- local_add(data->watermark, &data->wakeup);
+ if (head - local_read(&buffer->wakeup) > buffer->watermark)
+ local_add(buffer->watermark, &buffer->wakeup);

- handle->page = offset >> (PAGE_SHIFT + page_order(data));
- handle->page &= data->nr_pages - 1;
- handle->size = offset & ((PAGE_SIZE << page_order(data)) - 1);
- handle->addr = data->data_pages[handle->page];
+ handle->page = offset >> (PAGE_SHIFT + page_order(buffer));
+ handle->page &= buffer->nr_pages - 1;
+ handle->size = offset & ((PAGE_SIZE << page_order(buffer)) - 1);
+ handle->addr = buffer->data_pages[handle->page];
handle->addr += handle->size;
- handle->size = (PAGE_SIZE << page_order(data)) - handle->size;
+ handle->size = (PAGE_SIZE << page_order(buffer)) - handle->size;

if (have_lost) {
lost_event.header.type = PERF_RECORD_LOST;
lost_event.header.misc = 0;
lost_event.header.size = sizeof(lost_event);
lost_event.id = event->id;
- lost_event.lost = local_xchg(&data->lost, 0);
+ lost_event.lost = local_xchg(&buffer->lost, 0);

perf_output_put(handle, lost_event);
}
@@ -3148,7 +3148,7 @@ int perf_output_begin(struct perf_output_handle *handle,
return 0;

fail:
- local_inc(&data->lost);
+ local_inc(&buffer->lost);
perf_output_put_handle(handle);
out:
rcu_read_unlock();
@@ -3159,15 +3159,15 @@ out:
void perf_output_end(struct perf_output_handle *handle)
{
struct perf_event *event = handle->event;
- struct perf_mmap_data *data = handle->data;
+ struct perf_buffer *buffer = handle->buffer;

int wakeup_events = event->attr.wakeup_events;

if (handle->sample && wakeup_events) {
- int events = local_inc_return(&data->events);
+ int events = local_inc_return(&buffer->events);
if (events >= wakeup_events) {
- local_sub(wakeup_events, &data->events);
- local_inc(&data->wakeup);
+ local_sub(wakeup_events, &buffer->events);
+ local_inc(&buffer->wakeup);
}
}

@@ -5010,7 +5010,7 @@ err_size:
static int
perf_event_set_output(struct perf_event *event, struct perf_event *output_event)
{
- struct perf_mmap_data *data = NULL, *old_data = NULL;
+ struct perf_buffer *buffer = NULL, *old_buffer = NULL;
int ret = -EINVAL;

if (!output_event)
@@ -5040,19 +5040,19 @@ set:

if (output_event) {
/* get the buffer we want to redirect to */
- data = perf_mmap_data_get(output_event);
- if (!data)
+ buffer = perf_buffer_get(output_event);
+ if (!buffer)
goto unlock;
}

- old_data = event->data;
- rcu_assign_pointer(event->data, data);
+ old_buffer = event->buffer;
+ rcu_assign_pointer(event->buffer, buffer);
ret = 0;
unlock:
mutex_unlock(&event->mmap_mutex);

- if (old_data)
- perf_mmap_data_put(old_data);
+ if (old_buffer)
+ perf_buffer_put(old_buffer);
out:
return ret;
}