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Message-Id: <20190617043635.13201-5-alastair@au1.ibm.com>
Date: Mon, 17 Jun 2019 14:36:30 +1000
From: "Alastair D'Silva" <alastair@....ibm.com>
To: alastair@...ilva.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
David Hildenbrand <david@...hat.com>,
Oscar Salvador <osalvador@...e.com>,
Michal Hocko <mhocko@...e.com>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Wei Yang <richard.weiyang@...il.com>,
Juergen Gross <jgross@...e.com>, Qian Cai <cai@....pw>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Jiri Kosina <jkosina@...e.cz>,
Peter Zijlstra <peterz@...radead.org>,
Mukesh Ojha <mojha@...eaurora.org>,
Arun KS <arunks@...eaurora.org>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Baoquan He <bhe@...hat.com>,
Logan Gunthorpe <logang@...tatee.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory
From: Alastair D'Silva <alastair@...ilva.org>
When removing sufficiently large amounts of memory, we trigger RCU stall
detection. By periodically calling cond_resched(), we avoid bogus stall
warnings.
Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
---
mm/memory_hotplug.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index e096c987d261..382b3a0c9333 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -578,6 +578,9 @@ void __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
__remove_section(zone, __pfn_to_section(pfn), map_offset,
altmap);
map_offset = 0;
+
+ if (!(i & 0x0FFF))
+ cond_resched();
}
set_zone_contiguous(zone);
--
2.21.0
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