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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 /drivers/block/zram
parent7d3f3938236b4bb878214e6791e76fd8409bdeee (diff)
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 'drivers/block/zram')
-rw-r--r--drivers/block/zram/zram_drv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index bcde5c321090..f1c4bb34e007 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -450,7 +450,7 @@ static ssize_t mm_stat_show(struct device *dev,
zram->limit_pages << PAGE_SHIFT,
max_used << PAGE_SHIFT,
(u64)atomic64_read(&zram->stats.zero_pages),
- pool_stats.num_migrated);
+ pool_stats.pages_compacted);
up_read(&zram->init_lock);
return ret;