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Message-Id: <1414074700-13995-1-git-send-email-hannes@cmpxchg.org> Date: Thu, 23 Oct 2014 10:31:40 -0400 From: Johannes Weiner <hannes@...xchg.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Vladimir Davydov <vdavydov@...allels.com>, Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org, cgroups@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [patch] mm: memcontrol: uncharge pages on swapout fix Vladimir notes: > > + local_irq_disable(); > > + mem_cgroup_charge_statistics(memcg, page, -1); > > + memcg_check_events(memcg, page); > > + local_irq_enable(); > > AFAICT mem_cgroup_swapout() is called under mapping->tree_lock with irqs > disabled, so we should use irq_save/restore here. Simply remove the irq-disabling altogether and rely on the caller holding the mapping->tree_lock for now. Reported-by: Vladimir Davydov <vdavydov@...allels.com> Signed-off-by: Johannes Weiner <hannes@...xchg.org> Acked-by: Vladimir Davydov <vdavydov@...allels.com> --- mm/memcontrol.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) For "mm: memcontrol: uncharge pages on swapout" in -mm. diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ae9b630e928b..09fece0eb9f1 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5777,10 +5777,11 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) if (!mem_cgroup_is_root(memcg)) page_counter_uncharge(&memcg->memory, 1); - local_irq_disable(); + /* XXX: caller holds IRQ-safe mapping->tree_lock */ + VM_BUG_ON(!irqs_disabled()); + mem_cgroup_charge_statistics(memcg, page, -1); memcg_check_events(memcg, page); - local_irq_enable(); } /** -- 2.1.2 -- 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/
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