x86, bts, ptrace: move BTS buffer allocation from ds.c into ptrace.c

Impact: restructure DS memory allocation to be done by the usage site of DS

Require pre-allocated buffers in ds.h.

Move the BTS buffer allocation for ptrace into ptrace.c.
The pointer to the allocated buffer is stored in the traced task's
task_struct together with the handle returned by ds_request_bts().

Removes memory accounting code.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index a9780eaa6737..d02a0ca70ee9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1168,6 +1168,10 @@ struct task_struct {
          * This field actually belongs to the ptracer task.
          */
         struct bts_tracer *bts;
+        /*
+         * The buffer to hold the BTS data.
+         */
+        void *bts_buffer;
 #endif /* CONFIG_X86_PTRACE_BTS */
 
         /* PID/PID hash table linkage. */