linux-kernel - [PATCH 2/3] fork: reset mm->pinned

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Date:	Thu, 19 Jun 2014 13:07:47 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	<akpm@...ux-foundation.org>
CC:	<oleg@...hat.com>, <rientjes@...gle.com>, <cl@...ux.com>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] fork: reset mm->pinned_vm

mm->pinned_vm counts pages of mm's address space that were permanently
pinned in memory by increasing their reference counter. The counter was
introduced by commit bc3e53f682d9 ("mm: distinguish between mlocked and
pinned pages"), while before it locked_vm had been used for such pages.

Obviously, we should reset the counter on fork if !CLONE_VM, just like
we do with locked_vm, but currently we don't. Let's fix it.

Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
 kernel/fork.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/fork.c b/kernel/fork.c
index 01f0d0c56cb9..938707e108db 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -534,6 +534,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
 	atomic_long_set(&mm->nr_ptes, 0);
 	mm->map_count = 0;
 	mm->locked_vm = 0;
+	mm->pinned_vm = 0;
 	memset(&mm->rss_stat, 0, sizeof(mm->rss_stat));
 	spin_lock_init(&mm->page_table_lock);
 	mm_init_cpumask(mm);
-- 
1.7.10.4

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