commit 7e796a72a2691d7094fd62da61097294d0d59ce4
author Jack Steiner <steiner@sgi.com> Wed Jun 17 16:28:30 2009 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Thu Jun 18 13:04:03 2009 -0700
tree 9e8d4e1eae9a2d23f604f0af5d101979dc7afec7
parent d6e2fbce0d70c2072a1c478dbd37b34d27129d74

gru: collect per-context user statistics

Collect GRU statistics for each user GRU context.  Statistics are kept for
TLB misses & content resource contention.  Add user request for retrieving
the statistics.

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>

drivers/misc/sgi-gru/grufault.c

diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 6d06812..cdd151b 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -498,6 +498,7 @@
 		 */
 		if (!gts->ts_force_cch_reload &&
 					down_read_trylock(&gts->ts_mm->mmap_sem)) {
+			gts->ustats.fmm_tlbdropin++;
 			gru_try_dropin(gts, tfh, NULL);
 			up_read(&gts->ts_mm->mmap_sem);
 		} else {
@@ -516,6 +517,7 @@
 	struct gru_mm_struct *gms = gts->ts_gms;
 	int ret;
 
+	gts->ustats.upm_tlbdropin++;
 	while (1) {
 		wait_event(gms->ms_wait_queue,
 			   atomic_read(&gms->ms_range_active) == 0);
@@ -719,6 +721,31 @@
 }
 
 /*
+ * Fetch GSEG statisticss
+ */
+long gru_get_gseg_statistics(unsigned long arg)
+{
+	struct gru_thread_state *gts;
+	struct gru_get_gseg_statistics_req req;
+
+	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
+		return -EFAULT;
+
+	gts = gru_find_lock_gts(req.gseg);
+	if (gts) {
+		memcpy(&req.stats, &gts->ustats, sizeof(gts->ustats));
+		gru_unlock_gts(gts);
+	} else {
+		memset(&req.stats, 0, sizeof(gts->ustats));
+	}
+
+	if (copy_to_user((void __user *)arg, &req, sizeof(req)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/*
  * Register the current task as the user of the GSEG slice.
  * Needed for TLB fault interrupt targeting.
  */