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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2016-05-20 17:00:02 -0700 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-09-25 21:16:39 +0200 |
| commit | aa987496ae920cd82e1d8fa87fa2b32282b86a86 (patch) | |
| tree | ccc0928ecdc7b5f20c087cf157954104f67ae7c6 /drivers/block/zram | |
| parent | 30c7a1dfad0f030b4910bd0ec60be9f019902657 (diff) | |
zram: introduce per-device debug_stat sysfs node
debug_stat sysfs is read-only and represents various debugging data that
zram developers may need. This file is not meant to be used by anyone
else: its content is not documented and will change any time w/o any
notice. Therefore, the output of debug_stat file contains a version
string. To avoid any confusion, we will increase the version number
every time we modify the output.
At the moment this file exports only one value -- the number of
re-compressions, IOW, the number of times compression fast path has
failed. This stat is temporary any will be useful in case if any
per-cpu compression streams regressions will be reported.
Link: http://lkml.kernel.org/r/20160513230834.GB26763@bbox
Link: http://lkml.kernel.org/r/20160511134553.12655-1-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/zram')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 21 | ||||
| -rw-r--r-- | drivers/block/zram/zram_drv.h | 1 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 104fb1956..3394c4c3c 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -436,8 +436,26 @@ static ssize_t mm_stat_show(struct device *dev, return ret; } +static ssize_t debug_stat_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int version = 1; + struct zram *zram = dev_to_zram(dev); + ssize_t ret; + + down_read(&zram->init_lock); + ret = scnprintf(buf, PAGE_SIZE, + "version: %d\n%8llu\n", + version, + (u64)atomic64_read(&zram->stats.writestall)); + up_read(&zram->init_lock); + + return ret; +} + static DEVICE_ATTR_RO(io_stat); static DEVICE_ATTR_RO(mm_stat); +static DEVICE_ATTR_RO(debug_stat); ZRAM_ATTR_RO(num_reads); ZRAM_ATTR_RO(num_writes); ZRAM_ATTR_RO(failed_reads); @@ -720,6 +738,8 @@ compress_again: zcomp_strm_release(zram->comp, zstrm); zstrm = NULL; + atomic64_inc(&zram->stats.writestall); + handle = zs_malloc(meta->mem_pool, clen, GFP_NOIO | __GFP_HIGHMEM); if (handle) @@ -1136,6 +1156,7 @@ static struct attribute *zram_disk_attrs[] = { &dev_attr_comp_algorithm.attr, &dev_attr_io_stat.attr, &dev_attr_mm_stat.attr, + &dev_attr_debug_stat.attr, NULL, }; diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index 08a73cfcc..e894a82e5 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -85,6 +85,7 @@ struct zram_stats { atomic64_t zero_pages; /* no. of zero filled pages */ atomic64_t pages_stored; /* no. of pages currently stored */ atomic_long_t max_used_pages; /* no. of maximum pages stored */ + atomic64_t writestall; /* no. of write slow paths */ }; struct zram_meta { |