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Wed, 26 May 2021 17:46:32 +0000 From: Stephen Brennan To: stable@vger.kernel.org Cc: Stephen Brennan , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , Mel Gorman , Andy Whitcroft , Aruna Ramakrishna , Khalid Aziz Subject: [PATCH STABLE 4.4-5.3] mm, vmstat: drop zone->lock in /proc/pagetypeinfo Date: Wed, 26 May 2021 10:46:13 -0700 Message-Id: <20210526174613.339990-1-stephen.s.brennan@oracle.com> X-Mailer: git-send-email 2.27.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [2606:b400:8301:1041::11] X-ClientProxiedBy: SN4PR0501CA0055.namprd05.prod.outlook.com (2603:10b6:803:41::32) To BYAPR10MB2823.namprd10.prod.outlook.com (2603:10b6:a03:87::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (2606:b400:8301:1041::11) by SN4PR0501CA0055.namprd05.prod.outlook.com (2603:10b6:803:41::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.12 via Frontend Transport; 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Capping the iteration count alters the file contents in some cases, which means this approach may not be suitable for stable backports. However, dropping zone->lock in between migrate types (and, as a result, page orders) will not change the /proc/pagetypeinfo file contents. It can significantly reduce the length of time spent with IRQs disabled, which can prevent missed interrupts or soft lockups which we have observed on systems with particularly large memory. Thus, this commit is a modified version of the upstream one which only drops the lock in between migrate types. Fixes: 467c996c1e19 ("Print out statistics in relation to fragmentation avoidance to /proc/pagetypeinfo") Signed-off-by: Stephen Brennan Reviewed-by: Aruna Ramakrishna Reviewed-by: Khalid Aziz --- mm/vmstat.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/vmstat.c b/mm/vmstat.c index 13b74c4314a7e..663069cf7724a 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1316,6 +1316,9 @@ static void pagetypeinfo_showfree_print(struct seq_file *m, list_for_each(curr, &area->free_list[mtype]) freecount++; seq_printf(m, "%6lu ", freecount); + spin_unlock_irq(&zone->lock); + cond_resched(); + spin_lock_irq(&zone->lock); } seq_putc(m, '\n'); } -- 2.27.0