zram: export new 'io_stat' sysfs attrs

Per-device `zram<id>/io_stat' file provides accumulated I/O statistics of
particular zram device in a format similar to block layer statistics.  The
file consists of a single line and represents the following stats
(separated by whitespace):

        failed_reads
        failed_writes
        invalid_io
        notify_free

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
index 91ad707..a7f622f 100644 (file)
--- a/Documentation/ABI/testing/sysfs-block-zram
+++ b/Documentation/ABI/testing/sysfs-block-zram
@@ -149,3 +149,12 @@ Description:
                The compact file is write-only and trigger compaction for
                allocator zrm uses. The allocator moves some objects so that
                it could free fragment space.
+
+What:          /sys/block/zram<id>/io_stat
+Date:          August 2015
+Contact:       Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
+Description:
+               The io_stat file is read-only and accumulates device's I/O
+               statistics not accounted by block layer. For example,
+               failed_reads, failed_writes, etc. File format is similar to
+               block layer statistics file format.

diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index 971765e..9610be3 100644 (file)
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -133,6 +133,17 @@ File /sys/block/zram<id>/stat
 Represents block layer statistics. Read Documentation/block/stat.txt for
 details.
 
+File /sys/block/zram<id>/io_stat
+
+The stat file represents device's I/O statistics not accounted by block
+layer and, thus, not available in zram<id>/stat file. It consists of a
+single line of text and contains the following stats separated by
+whitespace:
+       failed_reads
+       failed_writes
+       invalid_io
+       notify_free
+
 8) Deactivate:
        swapoff /dev/zram0
        umount /dev/zram1

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 35dafd9..1b63a71 100644 (file)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1033,6 +1033,25 @@ static DEVICE_ATTR_RW(mem_used_max);
 static DEVICE_ATTR_RW(max_comp_streams);
 static DEVICE_ATTR_RW(comp_algorithm);
 
+static ssize_t io_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 %8llu\n",
+                       (u64)atomic64_read(&zram->stats.failed_reads),
+                       (u64)atomic64_read(&zram->stats.failed_writes),
+                       (u64)atomic64_read(&zram->stats.invalid_io),
+                       (u64)atomic64_read(&zram->stats.notify_free));
+       up_read(&zram->init_lock);
+
+       return ret;
+}
+
+static DEVICE_ATTR_RO(io_stat);
 ZRAM_ATTR_RO(num_reads);
 ZRAM_ATTR_RO(num_writes);
 ZRAM_ATTR_RO(failed_reads);
@@ -1060,6 +1079,7 @@ static struct attribute *zram_disk_attrs[] = {
        &dev_attr_mem_used_max.attr,
        &dev_attr_max_comp_streams.attr,
        &dev_attr_comp_algorithm.attr,
+       &dev_attr_io_stat.attr,
        NULL,
 };