From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933560AbaGXQ7L (ORCPT ); Thu, 24 Jul 2014 12:59:11 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:57478 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752666AbaGXQ7I (ORCPT ); Thu, 24 Jul 2014 12:59:08 -0400 Date: Thu, 24 Jul 2014 16:59:02 +0000 From: Serge Hallyn To: Aditya Kali Cc: tj@kernel.org, lizefan@huawei.com, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, mingo@redhat.com, containers@lists.linux-foundation.org Subject: Re: [PATCH 3/5] cgroup: add function to get task's cgroup on default hierarchy Message-ID: <20140724165902.GQ26600@ubuntumail> References: <1405626731-12220-1-git-send-email-adityakali@google.com> <1405626731-12220-4-git-send-email-adityakali@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1405626731-12220-4-git-send-email-adityakali@google.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Quoting Aditya Kali (adityakali@google.com): > get_task_cgroup() returns the (reference counted) cgroup of the > given task on the default hierarchy. > > Signed-off-by: Aditya Kali Acked-by: Serge E. Hallyn > --- > include/linux/cgroup.h | 1 + > kernel/cgroup.c | 25 +++++++++++++++++++++++++ > 2 files changed, 26 insertions(+) > > diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h > index b5223c5..707c302 100644 > --- a/include/linux/cgroup.h > +++ b/include/linux/cgroup.h > @@ -591,6 +591,7 @@ static inline void pr_cont_cgroup_path(struct cgroup *cgrp) > } > > char *task_cgroup_path(struct task_struct *task, char *buf, size_t buflen); > +struct cgroup *get_task_cgroup(struct task_struct *task); > > int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts); > int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts); > diff --git a/kernel/cgroup.c b/kernel/cgroup.c > index 1e94b71..1671345 100644 > --- a/kernel/cgroup.c > +++ b/kernel/cgroup.c > @@ -1937,6 +1937,31 @@ char *task_cgroup_path(struct task_struct *task, char *buf, size_t buflen) > } > EXPORT_SYMBOL_GPL(task_cgroup_path); > > +/* > + * get_task_cgroup - returns the cgroup of the task in the default cgroup > + * hierarchy. > + * > + * @task: target task > + * This function returns the @task's cgroup on the default cgroup hierarchy. The > + * returned cgroup has its reference incremented (by calling cgroup_get()). So > + * the caller must cgroup_put() the obtained reference once it is done with it. > + */ > +struct cgroup *get_task_cgroup(struct task_struct *task) > +{ > + struct cgroup *cgrp; > + > + mutex_lock(&cgroup_mutex); > + down_read(&css_set_rwsem); > + > + cgrp = task_cgroup_from_root(task, &cgrp_dfl_root); > + cgroup_get(cgrp); > + > + up_read(&css_set_rwsem); > + mutex_unlock(&cgroup_mutex); > + return cgrp; > +} > +EXPORT_SYMBOL_GPL(get_task_cgroup); > + > /* used to track tasks and other necessary states during migration */ > struct cgroup_taskset { > /* the src and dst cset list running through cset->mg_node */ > -- > 2.0.0.526.g5318336 > > _______________________________________________ > Containers mailing list > Containers@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/containers