Re: [Lxc-users] RAM swap caps - what isn't allowed?

[Daniel Lezcano]

On 12/16/2010 02:39 AM, Trent W. Buck wrote:
 Some combinations of RAM and swap caps aren't allowed, and I'm having a
 hard time understanding the pattern (i.e. *why*).  From the examples
 below, I *think* I cannot assign a smaller swap cap than RAM cap.

 Also, is there a way to specify that a container cannot use ANY swap,
 i.e. the swap cap is 0?


Yes, you have to specify memory and memswp with the same values.

The meaning of memory.memsw.limit_in_bytes is :

memsw = memory_size + swap_size

Assuming:
memory_size = 256MB
memsw = 256MB

256 = 256 + swap_size =  swap_size = 256 - 256 = 0MB





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Re: [Lxc-users] RAM swap caps - what isn't allowed?

[Trent W. Buck]

t...@cybersource.com.au (Trent W. Buck)
writes:

 Some combinations of RAM and swap caps aren't allowed, and I'm having a
 hard time understanding the pattern (i.e. *why*).  From the examples
 below, I *think* I cannot assign a smaller swap cap than RAM cap.

The explanation for this is obvious when I go back to the kernel docs:

  memory.limit_in_bytes   # set/show limit of memory usage
  memory.memsw.limit_in_bytes # set/show limit of memory+Swap usage

Since the latter number includes the former, it obviously cannot be
less.  Likewise, if the two values are equal, that should

 Also, is there a way to specify that a container cannot use ANY swap,
 i.e. the swap cap is 0?

...mean no paging out to swap is allowed.


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