rcu_read_unlock();
}
-static unsigned long perf_data_size(struct perf_mmap_data *data)
-{
- return data->nr_pages << (PAGE_SHIFT + data->data_order);
-}
-
#ifndef CONFIG_PERF_USE_VMALLOC
/*
goto fail_data_pages;
}
- data->data_order = 0;
data->nr_pages = nr_pages;
return data;
kfree(data);
}
+static inline int page_order(struct perf_mmap_data *data)
+{
+ return 0;
+}
+
#else
/*
* Required for architectures that have d-cache aliasing issues.
*/
+static inline int page_order(struct perf_mmap_data *data)
+{
+ return data->page_order;
+}
+
static struct page *
perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
{
- if (pgoff > (1UL << data->data_order))
+ if (pgoff > (1UL << page_order(data)))
return NULL;
return vmalloc_to_page((void *)data->user_page + pgoff * PAGE_SIZE);
int i, nr;
data = container_of(work, struct perf_mmap_data, work);
- nr = 1 << data->data_order;
+ nr = 1 << page_order(data);
base = data->user_page;
for (i = 0; i < nr + 1; i++)
data->user_page = all_buf;
data->data_pages[0] = all_buf + PAGE_SIZE;
- data->data_order = ilog2(nr_pages);
+ data->page_order = ilog2(nr_pages);
data->nr_pages = 1;
return data;
#endif
+static unsigned long perf_data_size(struct perf_mmap_data *data)
+{
+ return data->nr_pages << (PAGE_SHIFT + page_order(data));
+}
+
static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct perf_event *event = vma->vm_file->private_data;
preempt_enable();
}
-void perf_output_copy(struct perf_output_handle *handle,
+__always_inline void perf_output_copy(struct perf_output_handle *handle,
const void *buf, unsigned int len)
{
- unsigned int pages_mask;
- unsigned long offset;
- unsigned int size;
- void **pages;
-
- offset = handle->offset;
- pages_mask = handle->data->nr_pages - 1;
- pages = handle->data->data_pages;
-
do {
- unsigned long page_offset;
- unsigned long page_size;
- int nr;
+ unsigned long size = min_t(unsigned long, handle->size, len);
- nr = (offset >> PAGE_SHIFT) & pages_mask;
- page_size = 1UL << (handle->data->data_order + PAGE_SHIFT);
- page_offset = offset & (page_size - 1);
- size = min_t(unsigned int, page_size - page_offset, len);
+ memcpy(handle->addr, buf, size);
- memcpy(pages[nr] + page_offset, buf, size);
+ len -= size;
+ handle->addr += size;
+ handle->size -= size;
+ if (!handle->size) {
+ struct perf_mmap_data *data = handle->data;
- len -= size;
- buf += size;
- offset += size;
+ handle->page++;
+ handle->page &= data->nr_pages - 1;
+ handle->addr = data->data_pages[handle->page];
+ handle->size = PAGE_SIZE << page_order(data);
+ }
} while (len);
-
- handle->offset = offset;
-
- /*
- * Check we didn't copy past our reservation window, taking the
- * possible unsigned int wrap into account.
- */
- WARN_ON_ONCE(((long)(handle->head - handle->offset)) < 0);
}
int perf_output_begin(struct perf_output_handle *handle,
goto fail;
} while (local_cmpxchg(&data->head, offset, head) != offset);
- handle->offset = offset;
- handle->head = head;
+ if (head - local_read(&data->wakeup) > data->watermark)
+ local_add(data->watermark, &data->wakeup);
- if (head - tail > data->watermark)
- local_inc(&data->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->addr += handle->size;
+ handle->size = (PAGE_SIZE << page_order(data)) - handle->size;
if (have_lost) {
lost_event.header.type = PERF_RECORD_LOST;
struct perf_sample_data *data,
struct pt_regs *regs)
{
- if (perf_exclude_event(event, regs))
+ /*
+ * All tracepoints are from kernel-space.
+ */
+ if (event->attr.exclude_kernel)
return 0;
if (!perf_tp_filter_match(event, data))
int fput_needed = 0;
int ret = -EINVAL;
+ /*
+ * Don't allow output of inherited per-task events. This would
+ * create performance issues due to cross cpu access.
+ */
+ if (event->cpu == -1 && event->attr.inherit)
+ return -EINVAL;
+
if (!output_fd)
goto set;
if (event->data)
goto out;
+ /*
+ * Don't allow cross-cpu buffers
+ */
+ if (output_event->cpu != event->cpu)
+ goto out;
+
+ /*
+ * If its not a per-cpu buffer, it must be the same task.
+ */
+ if (output_event->cpu == -1 && output_event->ctx != event->ctx)
+ goto out;
+
atomic_long_inc(&output_file->f_count);
set:
struct perf_event_context *ctx;
struct file *event_file = NULL;
struct file *group_file = NULL;
+ int event_fd;
int fput_needed = 0;
- int fput_needed2 = 0;
int err;
/* for future expandability... */
return -EINVAL;
}
+ event_fd = get_unused_fd_flags(O_RDWR);
+ if (event_fd < 0)
+ return event_fd;
+
/*
* Get the target context (task or percpu):
*/
ctx = find_get_context(pid, cpu);
- if (IS_ERR(ctx))
- return PTR_ERR(ctx);
+ if (IS_ERR(ctx)) {
+ err = PTR_ERR(ctx);
+ goto err_fd;
+ }
/*
* Look up the group leader (we will attach this event to it):
if (IS_ERR(event))
goto err_put_context;
- err = anon_inode_getfd("[perf_event]", &perf_fops, event, O_RDWR);
- if (err < 0)
- goto err_free_put_context;
-
- event_file = fget_light(err, &fput_needed2);
- if (!event_file)
+ event_file = anon_inode_getfile("[perf_event]", &perf_fops, event, O_RDWR);
+ if (IS_ERR(event_file)) {
+ err = PTR_ERR(event_file);
goto err_free_put_context;
+ }
if (flags & PERF_FLAG_FD_OUTPUT) {
err = perf_event_set_output(event, group_fd);
list_add_tail(&event->owner_entry, ¤t->perf_event_list);
mutex_unlock(¤t->perf_event_mutex);
-err_fput_free_put_context:
- fput_light(event_file, fput_needed2);
+ fput_light(group_file, fput_needed);
+ fd_install(event_fd, event_file);
+ return event_fd;
+err_fput_free_put_context:
+ fput(event_file);
err_free_put_context:
- if (err < 0)
- free_event(event);
-
+ free_event(event);
err_put_context:
- if (err < 0)
- put_ctx(ctx);
-
fput_light(group_file, fput_needed);
-
+ put_ctx(ctx);
+err_fd:
+ put_unused_fd(event_fd);
return err;
}