linux-kernel - [PATCH 2/4] mm, page_ext: periodically reschedule during page_ext

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Message-Id: <20170720134029.25268-3-vbabka@suse.cz>
Date:   Thu, 20 Jul 2017 15:40:27 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Yang Shi <yang.shi@...aro.org>,
        Laura Abbott <labbott@...hat.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        zhong jiang <zhongjiang@...wei.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH 2/4] mm, page_ext: periodically reschedule during page_ext_init()

page_ext_init() can take long on large machines, so add a cond_resched() point
after each section is processed. This will allow moving the init to a later
point at boot without triggering lockup reports.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/page_ext.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page_ext.c b/mm/page_ext.c
index 88ccc044b09a..24cf8abefc8d 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -409,6 +409,7 @@ void __init page_ext_init(void)
 				continue;
 			if (init_section_page_ext(pfn, nid))
 				goto oom;
+			cond_resched();
 		}
 	}
 	hotplug_memory_notifier(page_ext_callback, 0);
-- 
2.13.2