perf: Split up buffer handling from core code

And create the internal perf events header.

v2: Keep an internal inlined perf_output_copy()

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Stephane Eranian <eranian@google.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1305827704-5607-1-git-send-email-fweisbec@gmail.com
[ v3: use clearer 'ring_buffer' and 'rb' naming ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 29 deletions

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 3412684ce5d5..779f6ed54d52 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -680,33 +680,6 @@ enum perf_event_active_state {
 };
 
 struct file;
-
-#define PERF_BUFFER_WRITABLE            0x01
-
-struct perf_buffer {
-        atomic_t                        refcount;
-        struct rcu_head                 rcu_head;
-#ifdef CONFIG_PERF_USE_VMALLOC
-        struct work_struct              work;
-        int                             page_order;     /* allocation order  */
-#endif
-        int                             nr_pages;       /* nr of data pages  */
-        int                             writable;       /* are we writable   */
-
-        atomic_t                        poll;           /* POLL_ for wakeups */
-
-        local_t                         head;           /* write position    */
-        local_t                         nest;           /* nested writers    */
-        local_t                         events;         /* event limit       */
-        local_t                         wakeup;         /* wakeup stamp      */
-        local_t                         lost;           /* nr records lost   */
-
-        long                            watermark;      /* wakeup watermark  */
-
-        struct perf_event_mmap_page     *user_page;
-        void                            *data_pages[0];
-};
-
 struct perf_sample_data;
 
 typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
@@ -745,6 +718,8 @@ struct perf_cgroup {
 };
 #endif
 
+struct ring_buffer;
+
 /**
  * struct perf_event - performance event kernel representation:
  */
@@ -834,7 +809,7 @@ struct perf_event {
         atomic_t                        mmap_count;
         int                             mmap_locked;
         struct user_struct              *mmap_user;
-        struct perf_buffer              *buffer;
+        struct ring_buffer              *rb;
 
         /* poll related */
         wait_queue_head_t               waitq;
@@ -945,7 +920,7 @@ struct perf_cpu_context {
 
 struct perf_output_handle {
         struct perf_event               *event;
-        struct perf_buffer              *buffer;
+        struct ring_buffer              *rb;
         unsigned long                   wakeup;
         unsigned long                   size;
         void                            *addr;