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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FECF2B4.5040500@jp.fujitsu.com>
Date:	Fri, 29 Jun 2012 09:11:32 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Michal Hocko <mhocko@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	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>,
	aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: memcg: cat: memory.memsw.* : Operation not supported

(2012/06/29 3:29), Tejun Heo wrote:
> Hello, Michal.
>
> On Thu, Jun 28, 2012 at 02:36:11PM +0200, Michal Hocko wrote:
>> @@ -2726,6 +2726,9 @@ static int cgroup_addrm_files(struct cgroup *cgrp, struct cgroup_subsys *subsys,
>>   	int err, ret = 0;
>>
>>   	for (cft = cfts; cft->name[0] != '\0'; cft++) {
>> +		if (subsys->cftype_enabled && !subsys->cftype_enabled(cft->name))
>> +			continue;
>> +
>>   		if (is_add)
>>   			err = cgroup_add_file(cgrp, subsys, cft);
>>   		else
>
> I hope we could avoid this dynamic decision.  That was one of the main
> reasons behind doing the cftype thing.  It's better to be able to
> "declare" these kind of things rather than being able to implement
> fully flexible dynamic logic.  Too much flexibility often doesn't
> achieve much while being a hindrance to evolution of code base (trying
> to improve / simplify X - ooh... there's this single wacko corner case
> YYY here which is really different from all other users).
>
> really_do_swap_account can't change once booted, right?  Why not just
> separate out memsw cfts into a separate array and call
> cgroup_add_cftypes() from init path?  Can't we do that from
> enable_swap_cgroup()?
>

Yes, that's will be good.

Thanks,
-Kame


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/