linux-kernel - [PATCH 03/11] cpuset: update cpuset->real_{cpus,mems}

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:	Wed, 21 Aug 2013 17:59:23 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: [PATCH 03/11] cpuset: update cpuset->real_{cpus,mems}_allowed at
 hotplug

We're going to have separate user-configured masks and effective ones.

At last configured masks can only be changed by writing cpuset.cpus
and cpuset.mems, and they won't be restricted by parent cpuset. While
effective masks reflect cpu/memory hotplug and hierachical restriction.

This is a preparation to make real_{cpus,mems}_allowed to be effective
masks of the cpuset:

- change the effective masks at hotplug: done
- change the effective masks at config change: todo
- take on ancestor's mask when the effective mask is empty: todo

This won't introduce behavior change.

Signed-off-by: Li Zefan <lizefan@...wei.com>
---
 kernel/cpuset.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 404fea5..ab89c1e 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2185,6 +2185,8 @@ retry:
 
 	mutex_lock(&callback_mutex);
 	cpumask_andnot(cs->cpus_allowed, cs->cpus_allowed, &off_cpus);
+	cpumask_andnot(cs->real_cpus_allowed, cs->real_cpus_allowed,
+		       &off_cpus);
 	mutex_unlock(&callback_mutex);
 
 	/*
@@ -2199,6 +2201,7 @@ retry:
 
 	mutex_lock(&callback_mutex);
 	nodes_andnot(cs->mems_allowed, cs->mems_allowed, off_mems);
+	nodes_andnot(cs->real_mems_allowed, cs->real_mems_allowed, off_mems);
 	mutex_unlock(&callback_mutex);
 
 	/*
@@ -2262,6 +2265,7 @@ static void cpuset_hotplug_workfn(struct work_struct *work)
 	if (cpus_updated) {
 		mutex_lock(&callback_mutex);
 		cpumask_copy(top_cpuset.cpus_allowed, &new_cpus);
+		cpumask_copy(top_cpuset.real_cpus_allowed, &new_cpus);
 		mutex_unlock(&callback_mutex);
 		/* we don't mess with cpumasks of tasks in top_cpuset */
 	}
@@ -2270,6 +2274,7 @@ static void cpuset_hotplug_workfn(struct work_struct *work)
 	if (mems_updated) {
 		mutex_lock(&callback_mutex);
 		top_cpuset.mems_allowed = new_mems;
+		top_cpuset.real_mems_allowed = new_mems;
 		mutex_unlock(&callback_mutex);
 		update_tasks_nodemask(&top_cpuset, NULL);
 	}
-- 
1.8.0.2
--
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/