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authorMinchan Kim <minchan@kernel.org>2018-12-28 11:36:51 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 23:11:49 +0300
commit23eddf39b2c28c05cb8f8203d38e61807d701b38 (patch)
tree30ec9421877d6171486386bb32122e7a077480bb /Documentation/blockdev
parenta939888ec38bf1f33e4a903056677e92a4844244 (diff)
downloadlinux-23eddf39b2c28c05cb8f8203d38e61807d701b38.tar.xz
zram: add bd_stat statistics
bd_stat represents things that happened in the backing device. Currently it supports bd_counts, bd_reads and bd_writes which are helpful to understand wearout of flash and memory saving. [minchan@kernel.org: v4] Link: http://lkml.kernel.org/r/20181203024045.153534-7-minchan@kernel.org Link: http://lkml.kernel.org/r/20181127055429.251614-7-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Joey Pabalinas <joeypabalinas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/blockdev')
-rw-r--r--Documentation/blockdev/zram.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index 806cdaabac83..906df97527a7 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -221,6 +221,17 @@ line of text and contains the following stats separated by whitespace:
pages_compacted the number of pages freed during compaction
huge_pages the number of incompressible pages
+File /sys/block/zram<id>/bd_stat
+
+The stat file represents device's backing device statistics. It consists of
+a single line of text and contains the following stats separated by whitespace:
+ bd_count size of data written in backing device.
+ Unit: 4K bytes
+ bd_reads the number of reads from backing device
+ Unit: 4K bytes
+ bd_writes the number of writes to backing device
+ Unit: 4K bytes
+
9) Deactivate:
swapoff /dev/zram0
umount /dev/zram1