perf/x86/intel: Reduce lbr_sel_map[] size

The index of lbr_sel_map is bit value of perf branch_sample_type.
PERF_SAMPLE_BRANCH_MAX is 1024 at present, so each lbr_sel_map uses
4096 bytes. By using bit shift as index, we can reduce lbr_sel_map
size to 40 bytes. This patch defines 'bit shift' for branch types,
and use 'bit shift' to define lbr_sel_maps.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Stephane Eranian <eranian@google.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: jolsa@redhat.com
Cc: linux-api@vger.kernel.org
Link: http://lkml.kernel.org/r/1415156173-10035-2-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 35 insertions, 14 deletions

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 9b79abbd1ab8..e46b93279e3d 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -152,21 +152,42 @@ enum perf_event_sample_format {
  * The branch types can be combined, however BRANCH_ANY covers all types
  * of branches and therefore it supersedes all the other types.
  */
+enum perf_branch_sample_type_shift {
+        PERF_SAMPLE_BRANCH_USER_SHIFT           = 0, /* user branches */
+        PERF_SAMPLE_BRANCH_KERNEL_SHIFT         = 1, /* kernel branches */
+        PERF_SAMPLE_BRANCH_HV_SHIFT             = 2, /* hypervisor branches */
+
+        PERF_SAMPLE_BRANCH_ANY_SHIFT            = 3, /* any branch types */
+        PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT       = 4, /* any call branch */
+        PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT     = 5, /* any return branch */
+        PERF_SAMPLE_BRANCH_IND_CALL_SHIFT       = 6, /* indirect calls */
+        PERF_SAMPLE_BRANCH_ABORT_TX_SHIFT       = 7, /* transaction aborts */
+        PERF_SAMPLE_BRANCH_IN_TX_SHIFT          = 8, /* in transaction */
+        PERF_SAMPLE_BRANCH_NO_TX_SHIFT          = 9, /* not in transaction */
+        PERF_SAMPLE_BRANCH_COND_SHIFT           = 10, /* conditional branches */
+
+        PERF_SAMPLE_BRANCH_MAX_SHIFT            /* non-ABI */
+};
+
 enum perf_branch_sample_type {
-        PERF_SAMPLE_BRANCH_USER         = 1U << 0, /* user branches */
-        PERF_SAMPLE_BRANCH_KERNEL       = 1U << 1, /* kernel branches */
-        PERF_SAMPLE_BRANCH_HV           = 1U << 2, /* hypervisor branches */
-
-        PERF_SAMPLE_BRANCH_ANY          = 1U << 3, /* any branch types */
-        PERF_SAMPLE_BRANCH_ANY_CALL     = 1U << 4, /* any call branch */
-        PERF_SAMPLE_BRANCH_ANY_RETURN   = 1U << 5, /* any return branch */
-        PERF_SAMPLE_BRANCH_IND_CALL     = 1U << 6, /* indirect calls */
-        PERF_SAMPLE_BRANCH_ABORT_TX     = 1U << 7, /* transaction aborts */
-        PERF_SAMPLE_BRANCH_IN_TX        = 1U << 8, /* in transaction */
-        PERF_SAMPLE_BRANCH_NO_TX        = 1U << 9, /* not in transaction */
-        PERF_SAMPLE_BRANCH_COND         = 1U << 10, /* conditional branches */
-
-        PERF_SAMPLE_BRANCH_MAX          = 1U << 11, /* non-ABI */
+        PERF_SAMPLE_BRANCH_USER         = 1U << PERF_SAMPLE_BRANCH_USER_SHIFT,
+        PERF_SAMPLE_BRANCH_KERNEL       = 1U << PERF_SAMPLE_BRANCH_KERNEL_SHIFT,
+        PERF_SAMPLE_BRANCH_HV           = 1U << PERF_SAMPLE_BRANCH_HV_SHIFT,
+
+        PERF_SAMPLE_BRANCH_ANY          = 1U << PERF_SAMPLE_BRANCH_ANY_SHIFT,
+        PERF_SAMPLE_BRANCH_ANY_CALL     =
+                                1U << PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT,
+        PERF_SAMPLE_BRANCH_ANY_RETURN   =
+                                1U << PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT,
+        PERF_SAMPLE_BRANCH_IND_CALL     =
+                                1U << PERF_SAMPLE_BRANCH_IND_CALL_SHIFT,
+        PERF_SAMPLE_BRANCH_ABORT_TX     =
+                                1U << PERF_SAMPLE_BRANCH_ABORT_TX_SHIFT,
+        PERF_SAMPLE_BRANCH_IN_TX        = 1U << PERF_SAMPLE_BRANCH_IN_TX_SHIFT,
+        PERF_SAMPLE_BRANCH_NO_TX        = 1U << PERF_SAMPLE_BRANCH_NO_TX_SHIFT,
+        PERF_SAMPLE_BRANCH_COND         = 1U << PERF_SAMPLE_BRANCH_COND_SHIFT,
+
+        PERF_SAMPLE_BRANCH_MAX          = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT,
 };
 
 #define PERF_SAMPLE_BRANCH_PLM_ALL \