From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754297AbaEMT21 (ORCPT ); Tue, 13 May 2014 15:28:27 -0400 Received: from mail-qg0-f41.google.com ([209.85.192.41]:56727 "EHLO mail-qg0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752464AbaEMT2T (ORCPT ); Tue, 13 May 2014 15:28:19 -0400 Date: Tue, 13 May 2014 15:28:14 -0400 From: Tejun Heo To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, Li Zefan , cgroups@vger.kernel.org Subject: [GIT PULL] more cgroup fixes for v3.15-rc5 Message-ID: <20140513192814.GC28815@htj.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Linus. Three more patches to fix cgroup_freezer breakage due to the recent cgroup internal locking changes - an operation cgroup_freezer was using now requires sleepable context and cgroup_freezer was invoking that while holding a spin lock. cgroup_freezer was using an overly elaborate hierarchical locking scheme. While it's possible to convert the hierarchical spinlocks directly to mutexes, this patch simplifies the overall locking so that it uses a global mutex. This has the added benefit of avoiding iterating potentially huge number of tasks under a spinlock. While the patch is on the larger side in the devel cycle, the changes made are mostly straight-forward and the locking logic is a lot simpler afterwards. The following changes since commit 36c38fb7144aa941dc072ba8f58b2dbe509c0345: blkcg: use trylock on blkcg_pol_mutex in blkcg_reset_stats() (2014-05-05 13:48:18 -0400) are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-3.15-fixes for you to fetch changes up to 36e9d2ebcc15d029b33f42a36146ab5a5bcfcfe7: cgroup: fix rcu_read_lock() leak in update_if_frozen() (2014-05-13 11:28:30 -0400) Thanks. ---------------------------------------------------------------- Tejun Heo (3): cgroup: introduce task_css_is_root() cgroup_freezer: replace freezer->lock with freezer_mutex cgroup: fix rcu_read_lock() leak in update_if_frozen() include/linux/cgroup.h | 15 +++++++ kernel/cgroup.c | 2 +- kernel/cgroup_freezer.c | 116 ++++++++++++++++++++---------------------------- 3 files changed, 65 insertions(+), 68 deletions(-) -- tejun