From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicholas Mc Guire Subject: [PATCH RT 4/5] allow preemption in mem_cgroup_move_account_page_stat Date: Mon, 10 Feb 2014 16:39:33 +0100 Message-ID: <20140210153933.GE20017@opentech.at> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: LKML , Sebastian Andrzej Siewior , Steven Rostedt , Peter Zijlstra , Carsten Emde , Thomas Gleixner , Andreas Platschek To: linux-rt-users@vger.kernel.org Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org allow preemption in mem_cgroup_move_account_page_stat as the call sites of mem_cgroup_move_account_page_stat are under move_lock_mem_cgroup move_unlock_mem_cgroup (spin_lock_irqsave/ spin_unlock_irqrestore respectively) the move operations preempt_disable/enable seem to be purely for migration protection so a migrate_disable/enable should be fine here. patch on top of 3.12.10-rt15 Signed-off-by: Nicholas Mc Guire --- mm/memcontrol.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a67e630f..e7cc35a 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3784,10 +3784,10 @@ void mem_cgroup_move_account_page_stat(struct mem_cgroup *from, enum mem_cgroup_stat_index idx) { /* Update stat data for mem_cgroup */ - preempt_disable(); + migrate_disable(); __this_cpu_sub(from->stat->count[idx], nr_pages); __this_cpu_add(to->stat->count[idx], nr_pages); - preempt_enable(); + migrate_enable(); } /** -- 1.7.2.5