diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-09 22:26:14 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-09 22:26:14 -0400 |
| commit | 0cf744bc7ae8e0072159a901f6e1a159bbc30ffa (patch) | |
| tree | fc8222a3a5af4f42226070c3f76462cfcf0b4e50 /Documentation/blockdev/zram.txt | |
| parent | b528392669415dc1e53a047215e5ad6c2de879fc (diff) | |
| parent | 7f8998c7aef3ac9c5f3f2943e083dfa6302e90d0 (diff) | |
Merge branch 'akpm' (fixes from Andrew Morton)
Merge patch-bomb from Andrew Morton:
- part of OCFS2 (review is laggy again)
- procfs
- slab
- all of MM
- zram, zbud
- various other random things: arch, filesystems.
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (164 commits)
nosave: consolidate __nosave_{begin,end} in <asm/sections.h>
include/linux/screen_info.h: remove unused ORIG_* macros
kernel/sys.c: compat sysinfo syscall: fix undefined behavior
kernel/sys.c: whitespace fixes
acct: eliminate compile warning
kernel/async.c: switch to pr_foo()
include/linux/blkdev.h: use NULL instead of zero
include/linux/kernel.h: deduplicate code implementing clamp* macros
include/linux/kernel.h: rewrite min3, max3 and clamp using min and max
alpha: use Kbuild logic to include <asm-generic/sections.h>
frv: remove deprecated IRQF_DISABLED
frv: remove unused cpuinfo_frv and friends to fix future build error
zbud: avoid accessing last unused freelist
zsmalloc: simplify init_zspage free obj linking
mm/zsmalloc.c: correct comment for fullness group computation
zram: use notify_free to account all free notifications
zram: report maximum used memory
zram: zram memory size limitation
zsmalloc: change return value unit of zs_get_total_size_bytes
zsmalloc: move pages_allocated to zs_pool
...
Diffstat (limited to 'Documentation/blockdev/zram.txt')
| -rw-r--r-- | Documentation/blockdev/zram.txt | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index 0595c3f56ccf..7fcf9c6592ec 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -74,14 +74,30 @@ There is little point creating a zram of greater than twice the size of memory since we expect a 2:1 compression ratio. Note that zram uses about 0.1% of the size of the disk when not in use so a huge zram is wasteful. -5) Activate: +5) Set memory limit: Optional + Set memory limit by writing the value to sysfs node 'mem_limit'. + The value can be either in bytes or you can use mem suffixes. + In addition, you could change the value in runtime. + Examples: + # limit /dev/zram0 with 50MB memory + echo $((50*1024*1024)) > /sys/block/zram0/mem_limit + + # Using mem suffixes + echo 256K > /sys/block/zram0/mem_limit + echo 512M > /sys/block/zram0/mem_limit + echo 1G > /sys/block/zram0/mem_limit + + # To disable memory limit + echo 0 > /sys/block/zram0/mem_limit + +6) Activate: mkswap /dev/zram0 swapon /dev/zram0 mkfs.ext4 /dev/zram1 mount /dev/zram1 /tmp -6) Stats: +7) Stats: Per-device statistics are exported as various nodes under /sys/block/zram<id>/ disksize @@ -95,12 +111,13 @@ 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 -7) Deactivate: +8) Deactivate: swapoff /dev/zram0 umount /dev/zram1 -8) Reset: +9) Reset: Write any positive value to 'reset' sysfs node echo 1 > /sys/block/zram0/reset echo 1 > /sys/block/zram1/reset |