diff options
| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2015-04-15 16:16:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-15 16:35:21 -0700 |
| commit | 4f2109f60881585dc04fa0b5657a60556576625c (patch) | |
| tree | 18965ef4da50218fefe6b899b5bdb35f4edb7d5c | |
| parent | 2f6a3bed7347ee94fe57b3501fddaa646a26d890 (diff) | |
zram: export new 'mm_stat' sysfs attrs
Per-device `zram<id>/mm_stat' file provides mm statistics of a 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):
orig_data_size
compr_data_size
mem_used_total
mem_limit
mem_used_max
zero_pages
num_migrated
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>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block-zram | 8 | ||||
| -rw-r--r-- | Documentation/blockdev/zram.txt | 12 | ||||
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 31 |
3 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram index a7f622f9bcf6..2e69e83bf510 100644 --- a/Documentation/ABI/testing/sysfs-block-zram +++ b/Documentation/ABI/testing/sysfs-block-zram @@ -158,3 +158,11 @@ Description: statistics not accounted by block layer. For example, failed_reads, failed_writes, etc. File format is similar to block layer statistics file format. + +What: /sys/block/zram<id>/mm_stat +Date: August 2015 +Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> +Description: + The mm_stat file is read-only and represents device's mm + statistics (orig_data_size, compr_data_size, etc.) in a format + similar to block layer statistics file format. diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index 9610be3e9d36..7920f4026d36 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -144,6 +144,18 @@ whitespace: invalid_io notify_free +File /sys/block/zram<id>/mm_stat + +The stat file represents device's mm statistics. It consists of a single +line of text and contains the following stats separated by whitespace: + orig_data_size + compr_data_size + mem_used_total + mem_limit + mem_used_max + zero_pages + num_migrated + 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 1b63a717bdbb..c94a1a98e301 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1051,7 +1051,37 @@ static ssize_t io_stat_show(struct device *dev, return ret; } +static ssize_t mm_stat_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct zram *zram = dev_to_zram(dev); + u64 orig_size, mem_used = 0; + long max_used; + ssize_t ret; + + down_read(&zram->init_lock); + if (init_done(zram)) + mem_used = zs_get_total_pages(zram->meta->mem_pool); + + orig_size = atomic64_read(&zram->stats.pages_stored); + max_used = atomic_long_read(&zram->stats.max_used_pages); + + ret = scnprintf(buf, PAGE_SIZE, + "%8llu %8llu %8llu %8lu %8ld %8llu %8llu\n", + orig_size << PAGE_SHIFT, + (u64)atomic64_read(&zram->stats.compr_data_size), + mem_used << PAGE_SHIFT, + zram->limit_pages << PAGE_SHIFT, + max_used << PAGE_SHIFT, + (u64)atomic64_read(&zram->stats.zero_pages), + (u64)atomic64_read(&zram->stats.num_migrated)); + up_read(&zram->init_lock); + + return ret; +} + static DEVICE_ATTR_RO(io_stat); +static DEVICE_ATTR_RO(mm_stat); ZRAM_ATTR_RO(num_reads); ZRAM_ATTR_RO(num_writes); ZRAM_ATTR_RO(failed_reads); @@ -1080,6 +1110,7 @@ static struct attribute *zram_disk_attrs[] = { &dev_attr_max_comp_streams.attr, &dev_attr_comp_algorithm.attr, &dev_attr_io_stat.attr, + &dev_attr_mm_stat.attr, NULL, }; |