linux-kernel - Re: [PATCH] mm,page_alloc: PF_WQ_WORKER threads must sleep at should_reclaim

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Date:   Mon, 30 Jul 2018 21:10:05 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Roman Gushchin <guro@...com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm,page_alloc: PF_WQ_WORKER threads must sleep at
 should_reclaim_retry().

This change has been posted several times with some concerns about the
changelog. Originally I thought it is more of a "nice to have" thing
rather than a bug fix, later Tetsuo has taken over it but the changelog
was not really comprehensible so I reworded it. Let's see if this is
better.

>From 9bbea6516bb99615aff5ba5699865aa2d48333cc Mon Sep 17 00:00:00 2001
From: Michal Hocko <mhocko@...e.com>
Date: Thu, 26 Jul 2018 14:40:03 +0900
Subject: [PATCH] mm,page_alloc: PF_WQ_WORKER threads must sleep at
 should_reclaim_retry().

Tetsuo Handa has reported that it is possible to bypass the short sleep
for PF_WQ_WORKER threads which was introduced by commit 373ccbe5927034b5
("mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make
any progress") and lock up the system if OOM.

The primary reason is that WQ_MEM_RECLAIM WQs are not guaranteed to
run even when they have a rescuer available. Those workers might be
essential for reclaim to make a forward progress, however. If we are
too unlucky all the allocations requests can get stuck waiting for a
WQ_MEM_RECLAIM work item and the system is essentially stuck in an OOM
condition without much hope to move on. Tetsuo has seen the reclaim
stuck on drain_local_pages_wq or xlog_cil_push_work (xfs). There might
be others.

Since should_reclaim_retry() should be a natural reschedule point,
let's do the short sleep for PF_WQ_WORKER threads unconditionally in
order to guarantee that other pending work items are started. This will
workaround this problem and it is less fragile than hunting down when
the sleep is missed. E.g. we used to have a sleeping point in the oom
path but this has been removed recently because it caused other issues.
Having a single sleeping point is more robust.

Reported-and-debugged-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Signed-off-by: Michal Hocko <mhocko@...e.com>
Cc: Roman Gushchin <guro@...com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Vladimir Davydov <vdavydov.dev@...il.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Tejun Heo <tj@...nel.org>
---
 mm/page_alloc.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1521100f1e63..f56cc0958d09 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3922,6 +3922,7 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
 {
 	struct zone *zone;
 	struct zoneref *z;
+	bool ret = false;

 	/*
 	 * Costly allocations might have made a progress but this doesn't mean
@@ -3985,25 +3986,26 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
 				}
 			}

-			/*
-			 * Memory allocation/reclaim might be called from a WQ
-			 * context and the current implementation of the WQ
-			 * concurrency control doesn't recognize that
-			 * a particular WQ is congested if the worker thread is
-			 * looping without ever sleeping. Therefore we have to
-			 * do a short sleep here rather than calling
-			 * cond_resched().
-			 */
-			if (current->flags & PF_WQ_WORKER)
-				schedule_timeout_uninterruptible(1);
-			else
-				cond_resched();
-
-			return true;
+			ret = true;
+			goto out;
 		}
 	}

-	return false;
+out:
+	/*
+	 * Memory allocation/reclaim might be called from a WQ
+	 * context and the current implementation of the WQ
+	 * concurrency control doesn't recognize that
+	 * a particular WQ is congested if the worker thread is
+	 * looping without ever sleeping. Therefore we have to
+	 * do a short sleep here rather than calling
+	 * cond_resched().
+	 */
+	if (current->flags & PF_WQ_WORKER)
+		schedule_timeout_uninterruptible(1);
+	else
+		cond_resched();
+	return ret;
 }

 static inline bool
-- 
2.18.0

-- 
Michal Hocko
SUSE Labs