sgi-gru: add statistics to the GRU context management functions

Add statistics to the GRU context management functions.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/gruhandles.c b/drivers/misc/sgi-gru/gruhandles.c
index 5b82e7def16d..9dcf5d896683 100644
--- a/drivers/misc/sgi-gru/gruhandles.c
+++ b/drivers/misc/sgi-gru/gruhandles.c
@@ -35,6 +35,16 @@
 /* Extract the status field from a kernel handle */
 #define GET_MSEG_HANDLE_STATUS(h)       (((*(unsigned long *)(h)) >> 16) & 3)
 
+struct mcs_op_statistic mcs_op_statistics[mcsop_last];
+
+static void update_mcs_stats(enum mcs_op op, unsigned long clks)
+{
+        atomic_long_inc(&mcs_op_statistics[op].count);
+        atomic_long_add(clks, &mcs_op_statistics[op].total);
+        if (mcs_op_statistics[op].max < clks)
+                mcs_op_statistics[op].max = clks;
+}
+
 static void start_instruction(void *h)
 {
         unsigned long *w0 = h;
@@ -57,6 +67,8 @@ static int wait_instruction_complete(void *h, enum mcs_op opc)
                 if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time))
                         panic("GRU %p is malfunctioning\n", h);
         }
+        if (gru_options & OPT_STATS)
+                update_mcs_stats(opc, get_cycles() - start_time);
         return status;
 }