diff options
Diffstat (limited to 'drivers/block')
| -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 8fcfbebe79cd..8fcad8b761f1 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -435,8 +435,26 @@ 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); @@ -719,6 +737,8 @@ 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) @@ -1181,6 +1201,7 @@ 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 06b1636f4722..3f5bf66a27e4 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 { |