linux-kernel - [patch] mm, swap_cgroup: reschedule when neeed in swap_cgroup

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Message-ID: <alpine.DEB.2.10.1704061315270.80559@chino.kir.corp.google.com>
Date:   Thu, 6 Apr 2017 13:16:24 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
cc:     Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [patch] mm, swap_cgroup: reschedule when neeed in
 swap_cgroup_swapoff()

We got need_resched() warnings in swap_cgroup_swapoff() because
swap_cgroup_ctrl[type].length is particularly large.

Reschedule when needed.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/swap_cgroup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -201,6 +201,8 @@ void swap_cgroup_swapoff(int type)
 			struct page *page = map[i];
 			if (page)
 				__free_page(page);
+			if (!(i % SWAP_CLUSTER_MAX))
+				cond_resched();
 		}
 		vfree(map);
 	}