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authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2015-09-08 15:04:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 15:35:28 -0700
commit860c707dca155a56dfa115ddd6c00959296144a6 (patch)
treee46b5110aa65f7b75ed8c8b6e5fa97367f10c05a /Documentation/blockdev
parent7d3f3938236b4bb878214e6791e76fd8409bdeee (diff)
downloadop-kernel-dev-860c707dca155a56dfa115ddd6c00959296144a6.zip
op-kernel-dev-860c707dca155a56dfa115ddd6c00959296144a6.tar.gz
zsmalloc: account the number of compacted pages
Compaction returns back to zram the number of migrated objects, which is quite uninformative -- we have objects of different sizes so user space cannot obtain any valuable data from that number. Change compaction to operate in terms of pages and return back to compaction issuer the number of pages that were freed during compaction. So from now on we will export more meaningful value in zram<id>/mm_stat -- the number of freed (compacted) pages. This requires: (a) a rename of `num_migrated' to 'pages_compacted' (b) a internal API change -- return first_page's fullness_group from putback_zspage(), so we know when putback_zspage() did free_zspage(). It helps us to account compaction stats correctly. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-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 'Documentation/blockdev')
-rw-r--r--Documentation/blockdev/zram.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index c4de576..62435bb 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -144,7 +144,8 @@ mem_used_max RW the maximum amount memory zram have consumed to
store compressed data
mem_limit RW the maximum amount of memory ZRAM can use to store
the compressed data
-num_migrated RO the number of objects migrated migrated by compaction
+pages_compacted RO the number of pages freed during compaction
+ (available only via zram<id>/mm_stat node)
compact WO trigger memory compaction
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