linux-kernel - Re: memcg: cat: memory.memsw.* : Operation not supported

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Date:	Wed, 27 Jun 2012 13:21:27 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Tejun Heo <tj@...nel.org>
cc:	Michal Hocko <mhocko@...e.cz>, Zhouping Liu <zliu@...hat.com>,
	linux-mm@...ck.org, Li Zefan <lizefan@...wei.com>,
	CAI Qian <caiqian@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: memcg: cat: memory.memsw.* : Operation not supported

On Wed, 27 Jun 2012, Tejun Heo wrote:

> Yeah, it's kinda ugly.  Taking a step back, do we really need be able
> to configure out memsw?  How much vmlinux bloat or runtime overhead
> are we talking about?  I don't think config options need to be this
> granular.
> 

Well it also has a prerequisite that memcg doesn't have: CONFIG_SWAP, so 
even if CONFIG_CGROUP_MEM_RES_CTLR_SWAP is folded into 
CONFIG_CGROUP_MEM_RES_CTLR, then these should still depend on CONFIG_SWAP 
since configuring them would imply there is some limit to be enforced.

But to answer your question:

   text	   data	    bss	    dec	    hex	filename
  25777	   3644	   4128	  33549	   830d	memcontrol.o.swap_disabled
  27294	   4476	   4128	  35898	   8c3a	memcontrol.o.swap_enabled

Is it really too painful to not create these files when 
CONFIG_CGROUP_MEM_RES_CTLR_SWAP is disabled?  If so, can we at least allow 
them to be opened but return -EINVAL if memory.memsw.limit_in_bytes is 
written?
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