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| author | Minchan Kim <minchan@kernel.org> | 2018-06-08 03:05:45 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-08 03:34:34 +0300 |
| commit | d7eac6b6e1838ef1a1400df4ec55daa34bbc855e (patch) | |
| tree | c909e5c21f836908a88de0fcc8cce881eec5842a /drivers/block/zram/zram_drv.h | |
| parent | 89e85bce4b02edb7408aebf69d5d1a6692a05f4f (diff) | |
| download | linux-d7eac6b6e1838ef1a1400df4ec55daa34bbc855e.tar.xz | |
zram: record accessed second
zRam as swap is useful for small memory device. However, swap means
those pages on zram are mostly cold pages due to VM's LRU algorithm.
Especially, once init data for application are touched for launching,
they tend to be not accessed any more and finally swapped out. zRAM can
store such cold pages as compressed form but it's pointless to keep in
memory. Better idea is app developers free them directly rather than
remaining them on heap.
This patch records last access time of each block of zram so that With
upcoming zram memory tracking, it could help userspace developers to
reduce memory footprint.
Link: http://lkml.kernel.org/r/20180416090946.63057-4-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/zram/zram_drv.h')
| -rw-r--r-- | drivers/block/zram/zram_drv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index ff0547bdb586..1075218e88b2 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -61,6 +61,7 @@ struct zram_table_entry { unsigned long element; }; unsigned long value; + u64 ac_time; }; struct zram_stats { |