linux-kernel - Re: [RFC PATCH 4/4] cgroups: Add an rlimit subsystem

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Tue, 28 Jun 2011 17:37:17 +0000 (UTC)
From:	Aditya Kali <adityakali@...gle.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/4] cgroups: Add an rlimit subsystem

Paul Menage <menage <at> google.com> writes:
> What we need is a res_counter_move_charge(A, B, amount) function which will:
> 
> - locate C, the nearest common ancestor of A and B
> - lock up the chain from B up to but not including C, adding the new charge
> - unlock up the chain from B to C
> - uncharge along the chain from A up to but not including C (not sure
> how much locking is needed there since there's no need for roll back).
> 
> Paul
> 

Another alternative is to use the 'attach' callback in struct cgroup_subsys which
gets both the old cgroup and the new cgroup as parameters and do
rlim_remove_proc(old_cgrp) and res_counter_charge(new_cgrp) in this same
function under the protection of a spinlock.
It would be good to add a return value to the 'attach' callback too.



--
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/