Revert "Android: MMC/UFS IO Latency Histograms."

This reverts commit 8d525c512280bb7d8218fd59c04de985b1886eca.

Change-Id: I69350b98d9de9b1c9f591e03a90f133e328ba72a

1 files changed, 0 insertions, 76 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index faf2c0093527..c70e3588a48c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -197,9 +197,6 @@ struct request {
 
 	/* for bidi */
 	struct request *next_rq;
-
-	ktime_t			lat_hist_io_start;
-	int			lat_hist_enabled;
 };
 
 static inline unsigned short req_get_ioprio(struct request *req)
@@ -1648,79 +1645,6 @@ extern int bdev_write_page(struct block_device *, sector_t, struct page *,
 						struct writeback_control *);
 extern long bdev_direct_access(struct block_device *, sector_t,
 		void __pmem **addr, unsigned long *pfn, long size);
-
-/*
- * X-axis for IO latency histogram support.
- */
-static const u_int64_t latency_x_axis_us[] = {
-	100,
-	200,
-	300,
-	400,
-	500,
-	600,
-	700,
-	800,
-	900,
-	1000,
-	1200,
-	1400,
-	1600,
-	1800,
-	2000,
-	2500,
-	3000,
-	4000,
-	5000,
-	6000,
-	7000,
-	9000,
-	10000
-};
-
-#define BLK_IO_LAT_HIST_DISABLE         0
-#define BLK_IO_LAT_HIST_ENABLE          1
-#define BLK_IO_LAT_HIST_ZERO            2
-
-struct io_latency_state {
-	u_int64_t	latency_y_axis_read[ARRAY_SIZE(latency_x_axis_us) + 1];
-	u_int64_t	latency_reads_elems;
-	u_int64_t	latency_y_axis_write[ARRAY_SIZE(latency_x_axis_us) + 1];
-	u_int64_t	latency_writes_elems;
-};
-
-static inline void
-blk_update_latency_hist(struct io_latency_state *s,
-			int read,
-			u_int64_t delta_us)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(latency_x_axis_us); i++) {
-		if (delta_us < (u_int64_t)latency_x_axis_us[i]) {
-			if (read)
-				s->latency_y_axis_read[i]++;
-			else
-				s->latency_y_axis_write[i]++;
-			break;
-		}
-	}
-	if (i == ARRAY_SIZE(latency_x_axis_us)) {
-		/* Overflowed the histogram */
-		if (read)
-			s->latency_y_axis_read[i]++;
-		else
-			s->latency_y_axis_write[i]++;
-	}
-	if (read)
-		s->latency_reads_elems++;
-	else
-		s->latency_writes_elems++;
-}
-
-void blk_zero_latency_hist(struct io_latency_state *s);
-ssize_t blk_latency_hist_show(struct io_latency_state *s, char *buf);
-
 #else /* CONFIG_BLOCK */
 
 struct block_device;