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BACKPORT: zram: export new 'io_stat' sysfs attrs

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(cherry-pick from commit 2f6a3bed7347ee94fe57b3501fddaa646a26d890)

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

Bug: 25951511

Change-Id: I0041225192b8935983790dacc26b78bc18c2531c
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>
This commit is contained in:
Sergey Senozhatsky 2015-04-15 16:16:03 -07:00 committed by Artem Borisov
parent 580332a1a7
commit 90e7033022
3 changed files with 40 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-block-zram
View file

@ -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.

11
Documentation/blockdev/zram.txt
View file

@ -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

20
drivers/block/zram/zram_drv.c
View file

@ -1010,6 +1010,25 @@ static DEVICE_ATTR(max_comp_streams, S_IRUGO | S_IWUSR,
static DEVICE_ATTR(comp_algorithm, S_IRUGO | S_IWUSR,
comp_algorithm_show, comp_algorithm_store);
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(io_stat, S_IRUGO, io_stat_show, NULL);
ZRAM_ATTR_RO(num_reads);
ZRAM_ATTR_RO(num_writes);
ZRAM_ATTR_RO(failed_reads);
@ -1038,6 +1057,7 @@ 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,
};