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| author |   Minchan Kim <minchan@kernel.org> | 2014-10-09 15:29:55 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-09 22:26:02 -0400 |
| commit | 461a8eee6af3b55745be64bea403ed0b743563cf (patch) | |
| tree | a1bea4ab73525d7f3f56c437b86843b04cb0e03c /Documentation/blockdev | |
| parent | zram: zram memory size limitation (diff) | |
| download | linux-dev-461a8eee6af3b55745be64bea403ed0b743563cf.tar.xz linux-dev-461a8eee6af3b55745be64bea403ed0b743563cf.zip | |
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>
Diffstat (limited to 'Documentation/blockdev')
| -rw-r--r-- | Documentation/blockdev/zram.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index 82c6a41116db..7fcf9c6592ec 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -111,6 +111,7 @@ size of the disk when not in use so a huge zram is wasteful. orig_data_size compr_data_size mem_used_total + mem_used_max 8) Deactivate: swapoff /dev/zram0 |