Messages in this thread | | | Date | Wed, 21 Mar 2012 13:42:39 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH 06/10] cgroup: convert memcg controller to the new cftype interface |
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(2012/03/20 1:10), Tejun Heo wrote:
> Hello, > > On Mon, Mar 19, 2012 at 01:26:02PM +0900, KAMEZAWA Hiroyuki wrote: >>> +CGROUP_SUBSYS_CFTYPES_COND(mem_cgroup_subsys, memsw_cgroup_files, >>> + really_do_swap_account); >> >> >> I'm sorry but why you use really_do_swap_account instead of do_swap_account ? > > Because do_swap_account is initialized too late. > CGROUP_SUBSYS_CFTYPES() are processed via fs_initcall(). AFAICS, > do_swap_account may not have been initialized by then. Also, if memcg > as whole is disabled, it doesn't matter whether those files are > registered or not, right? We probably need some comment there tho. >
I think creating file based on really_do_swap_account is wrong. (I'm sorry for this complication.)
How about creating this file unconditionally ? Returning -ENOTSUP in memcg's handler will work well...anyway it's configured, no reason to show them is bad.
Thanks, -Kame
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