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From: Minchan Kim <minchan@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Joey Pabalinas <joeypabalinas@gmail.com>,
	Minchan Kim <minchan@kernel.org>
Subject: [PATCH v3 6/7] zram: add bd_stat statistics
Date: Tue, 27 Nov 2018 14:54:28 +0900
Message-ID: <20181127055429.251614-7-minchan@kernel.org> (raw)
In-Reply-To: <20181127055429.251614-1-minchan@kernel.org>

bd_stat represents things happened in backing device. Currently,
it supports bd_counts, bd_reads and bd_writes which are helpful
to understand wearout of flash and memory saving.

Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 Documentation/ABI/testing/sysfs-block-zram |  8 ++++++
 Documentation/blockdev/zram.txt            | 11 ++++++++
 drivers/block/zram/zram_drv.c              | 29 ++++++++++++++++++++++
 drivers/block/zram/zram_drv.h              |  5 ++++
 4 files changed, 53 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
index d1f80b077885..65fc33b2f53b 100644
--- a/Documentation/ABI/testing/sysfs-block-zram
+++ b/Documentation/ABI/testing/sysfs-block-zram
@@ -113,3 +113,11 @@ Contact:	Minchan Kim <minchan@kernel.org>
 Description:
 		The writeback file is write-only and trigger idle and/or
 		huge page writeback to backing device.
+
+What:		/sys/block/zram<id>/bd_stat
+Date:		November 2018
+Contact:	Minchan Kim <minchan@kernel.org>
+Description:
+		The bd_stat file is read-only and represents backing device's
+		statistics (bd_count, bd_reads, bd_writes) in a format
+		similar to block layer statistics file format.
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index 806cdaabac83..906df97527a7 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -221,6 +221,17 @@ The stat file represents device's mm statistics. It consists of a single
  pages_compacted  the number of pages freed during compaction
  huge_pages	  the number of incompressible pages
 
+File /sys/block/zram<id>/bd_stat
+
+The stat file represents device's backing device statistics. It consists of
+a single line of text and contains the following stats separated by whitespace:
+ bd_count	size of data written in backing device.
+		Unit: 4K bytes
+ bd_reads	the number of reads from backing device
+		Unit: 4K bytes
+ bd_writes	the number of writes to backing device
+		Unit: 4K bytes
+
 9) Deactivate:
 	swapoff /dev/zram0
 	umount /dev/zram1
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 6b5a886c8f32..67168a6ecca6 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -502,6 +502,7 @@ static unsigned long alloc_block_bdev(struct zram *zram)
 	if (test_and_set_bit(blk_idx, zram->bitmap))
 		goto retry;
 
+	atomic64_inc(&zram->stats.bd_count);
 	return blk_idx;
 }
 
@@ -511,6 +512,7 @@ static void free_block_bdev(struct zram *zram, unsigned long blk_idx)
 
 	was_set = test_and_clear_bit(blk_idx, zram->bitmap);
 	WARN_ON_ONCE(!was_set);
+	atomic64_dec(&zram->stats.bd_count);
 }
 
 static void zram_page_end_io(struct bio *bio)
@@ -668,6 +670,7 @@ static ssize_t writeback_store(struct device *dev,
 			continue;
 		}
 
+		atomic64_inc(&zram->stats.bd_writes);
 		/*
 		 * We released zram_slot_lock so need to check if the slot was
 		 * changed. If there is freeing for the slot, we can catch it
@@ -757,6 +760,7 @@ static int read_from_bdev_sync(struct zram *zram, struct bio_vec *bvec,
 static int read_from_bdev(struct zram *zram, struct bio_vec *bvec,
 			unsigned long entry, struct bio *parent, bool sync)
 {
+	atomic64_inc(&zram->stats.bd_reads);
 	if (sync)
 		return read_from_bdev_sync(zram, bvec, entry, parent);
 	else
@@ -1013,6 +1017,25 @@ static ssize_t mm_stat_show(struct device *dev,
 	return ret;
 }
 
+#ifdef CONFIG_ZRAM_WRITEBACK
+static ssize_t bd_stat_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct zram *zram = dev_to_zram(dev);
+	ssize_t ret;
+
+	down_read(&zram->init_lock);
+	ret = scnprintf(buf, PAGE_SIZE,
+			"%8llu %8llu %8llu\n",
+			(u64)atomic64_read(&zram->stats.bd_count),
+			(u64)atomic64_read(&zram->stats.bd_reads),
+			(u64)atomic64_read(&zram->stats.bd_writes));
+	up_read(&zram->init_lock);
+
+	return ret;
+}
+#endif
+
 static ssize_t debug_stat_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -1033,6 +1056,9 @@ static ssize_t debug_stat_show(struct device *dev,
 
 static DEVICE_ATTR_RO(io_stat);
 static DEVICE_ATTR_RO(mm_stat);
+#ifdef CONFIG_ZRAM_WRITEBACK
+static DEVICE_ATTR_RO(bd_stat);
+#endif
 static DEVICE_ATTR_RO(debug_stat);
 
 static void zram_meta_free(struct zram *zram, u64 disksize)
@@ -1759,6 +1785,9 @@ static struct attribute *zram_disk_attrs[] = {
 #endif
 	&dev_attr_io_stat.attr,
 	&dev_attr_mm_stat.attr,
+#ifdef CONFIG_ZRAM_WRITEBACK
+	&dev_attr_bd_stat.attr,
+#endif
 	&dev_attr_debug_stat.attr,
 	NULL,
 };
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 1ad74f030b6d..bc477803530d 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -82,6 +82,11 @@ struct zram_stats {
 	atomic_long_t max_used_pages;	/* no. of maximum pages stored */
 	atomic64_t writestall;		/* no. of write slow paths */
 	atomic64_t miss_free;		/* no. of missed free */
+#ifdef	CONFIG_ZRAM_WRITEBACK
+	atomic64_t bd_count;		/* no. of pages in backing device */
+	atomic64_t bd_reads;		/* no. of reads from backing device */
+	atomic64_t bd_writes;		/* no. of writes from backing device */
+#endif
 };
 
 struct zram {
-- 
2.20.0.rc0.387.gc7a69e6b6c-goog


  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-27  5:54 [PATCH v3 0/7] zram idle page writeback Minchan Kim
2018-11-27  5:54 ` [PATCH v3 1/7] zram: fix lockdep warning of free block handling Minchan Kim
2018-11-29  2:43   ` Sergey Senozhatsky
2018-11-27  5:54 ` [PATCH v3 2/7] zram: fix double free backing device Minchan Kim
2018-11-29  2:32   ` Sergey Senozhatsky
2018-11-27  5:54 ` [PATCH v3 3/7] zram: refactoring flags and writeback stuff Minchan Kim
2018-11-27  5:54 ` [PATCH v3 4/7] zram: introduce ZRAM_IDLE flag Minchan Kim
2018-11-29  2:29   ` Sergey Senozhatsky
2018-11-27  5:54 ` [PATCH v3 5/7] zram: support idle/huge page writeback Minchan Kim
2018-11-28 23:35   ` Andrew Morton
2018-11-29  1:36     ` Minchan Kim
2018-11-27  5:54 ` Minchan Kim [this message]
2018-11-27  5:54 ` [PATCH v3 7/7] zram: writeback throttle Minchan Kim
2018-11-28 23:41   ` Andrew Morton
2018-11-29  1:55     ` Minchan Kim
2018-11-29  2:23   ` Sergey Senozhatsky
2018-12-02 23:18     ` Minchan Kim
2018-12-03  2:30       ` Sergey Senozhatsky
2018-12-03  2:41         ` Minchan Kim
2018-12-03  2:45           ` Sergey Senozhatsky
2018-11-30  4:36 ` [PATCH v3 0/7] zram idle page writeback Sergey Senozhatsky
2018-12-02 23:20   ` Minchan Kim
2018-12-02 23:28 ` Joey Pabalinas

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