diff options
| author | Minchan Kim <minchan@kernel.org> | 2014-10-09 15:29:55 -0700 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2015-05-11 21:23:25 +0800 |
| commit | cda6b06454ce34ec784cc45c427eb4b0131581e1 (patch) | |
| tree | 7e6c7d5f55ef08a8f6d0f9749856ed19a815a446 /Documentation/ABI/testing/sysfs-block-zram | |
| parent | 3c854b64635888527504dfc898687ab10dad6191 (diff) | |
zram: report maximum used memory
Normally, zram user could get maximum memory usage zram consumed via
polling mem_used_total with sysfs in userspace.
But it has a critical problem because user can miss peak memory usage
during update inverval of polling. For avoiding that, user should poll it
with shorter interval(ie, 0.0000000001s) with mlocking to avoid page fault
delay when memory pressure is heavy. It would be troublesome.
This patch adds new knob "mem_used_max" so user could see the maximum
memory usage easily via reading the knob and reset it via "echo 0 >
/sys/block/zram0/mem_used_max".
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Dan Streetman <ddstreet@ieee.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: <juno.choi@lge.com>
Cc: <seungho1.park@lge.com>
Cc: Luigi Semenzato <semenzato@google.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Reviewed-by: David Horner <ds2horner@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 461a8eee6af3b55745be64bea403ed0b743563cf)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-block-zram')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block-zram | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram index f861cbfab6b1..31db44f01936 100644 --- a/Documentation/ABI/testing/sysfs-block-zram +++ b/Documentation/ABI/testing/sysfs-block-zram @@ -128,6 +128,16 @@ Description: statistic. Unit: bytes +What: /sys/block/zram<id>/mem_used_max +Date: August 2014 +Contact: Minchan Kim <minchan@kernel.org> +Description: + The mem_used_max file is read/write and specifies the amount + of maximum memory zram have consumed to store compressed data. + For resetting the value, you should write "0". Otherwise, + you could see -EINVAL. + Unit: bytes + What: /sys/block/zram<id>/mem_limit Date: August 2014 Contact: Minchan Kim <minchan@kernel.org> |