From: "Huang, Ying" <ying.huang@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Huang Ying <ying.huang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, Rik van Riel <riel@redhat.com>,
Mel Gorman <mgorman@suse.de>, Ingo Molnar <mingo@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Fengguang Wu <fengguang.wu@intel.com>
Subject: [RFC 01/10] autonuma: Fix watermark checking in migrate_balanced_pgdat()
Date: Fri, 1 Nov 2019 15:57:18 +0800 [thread overview]
Message-ID: <20191101075727.26683-2-ying.huang@intel.com> (raw)
In-Reply-To: <20191101075727.26683-1-ying.huang@intel.com>
From: Huang Ying <ying.huang@intel.com>
When zone_watermark_ok() is called in migrate_balanced_pgdat() to
check migration target node, the parameter classzone_idx (for
requested zone) is specified as 0 (ZONE_DMA). But when allocating
memory for autonuma in alloc_misplaced_dst_page(), the requested zone
from GFP flags is ZONE_MOVABLE. That is, the requested zone is
different. The size of lowmem_reserve for the different requested
zone is different. And this may cause some issues.
For example, in the zoneinfo of a test machine as below,
Node 0, zone DMA32
pages free 61592
min 29
low 454
high 879
spanned 1044480
present 442306
managed 425921
protection: (0, 0, 62457, 62457, 62457)
The free page number of ZONE_DMA32 is greater than "high watermark +
lowmem_reserve[ZONE_DMA]", but less than "high watermark +
lowmem_reserve[ZONE_MOVABLE]". And because __alloc_pages_node() in
alloc_misplaced_dst_page() requests ZONE_MOVABLE, the
zone_watermark_ok() on ZONE_DMA32 in migrate_balanced_pgdat() may
always return true. So, autonuma may not stop even when memory
pressure in node 0 is heavy.
To fix the issue, ZONE_MOVABLE is used as parameter to call
zone_watermark_ok() in migrate_balanced_pgdat(). This makes it same
as requested zone in alloc_misplaced_dst_page(). So that
migrate_balanced_pgdat() returns false when memory pressure is heavy.
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
---
mm/migrate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 513107baccd3..8f06bd37d927 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1954,7 +1954,7 @@ static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
if (!zone_watermark_ok(zone, 0,
high_wmark_pages(zone) +
nr_migrate_pages,
- 0, 0))
+ ZONE_MOVABLE, 0))
continue;
return true;
}
--
2.23.0
next prev parent reply other threads:[~2019-11-01 7:58 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-01 7:57 [RFC 00/10] autonuma: Optimize memory placement in memory tiering system Huang, Ying
2019-11-01 7:57 ` Huang, Ying [this message]
2019-11-01 11:11 ` [RFC 01/10] autonuma: Fix watermark checking in migrate_balanced_pgdat() Mel Gorman
2019-11-01 7:57 ` [RFC 02/10] autonuma: Reduce cache footprint when scanning page tables Huang, Ying
2019-11-01 11:13 ` Mel Gorman
2019-11-01 7:57 ` [RFC 03/10] autonuma: Add NUMA_BALANCING_MEMORY_TIERING mode Huang, Ying
2019-11-01 7:57 ` [RFC 04/10] autonuma, memory tiering: Rate limit NUMA migration throughput Huang, Ying
2019-11-01 7:57 ` [RFC 05/10] autonuma, memory tiering: Use kswapd to demote cold pages to PMEM Huang, Ying
2019-11-01 7:57 ` [RFC 06/10] autonuma, memory tiering: Skip to scan fastest memory Huang, Ying
2019-11-01 7:57 ` [RFC 07/10] autonuma, memory tiering: Only promote page if accessed twice Huang, Ying
2019-11-01 7:57 ` [RFC 08/10] autonuma, memory tiering: Select hotter pages to promote to fast memory node Huang, Ying
2019-11-01 9:24 ` Peter Zijlstra
2019-11-04 2:41 ` Huang, Ying
2019-11-04 8:44 ` Peter Zijlstra
2019-11-04 10:13 ` Huang, Ying
2019-11-01 7:57 ` [RFC 09/10] autonuma, memory tiering: Double hot threshold for write hint page fault Huang, Ying
2019-11-01 7:57 ` [RFC 10/10] autonuma, memory tiering: Adjust hot threshold automatically Huang, Ying
2019-11-01 9:31 ` Peter Zijlstra
2019-11-04 6:11 ` Huang, Ying
2019-11-04 8:49 ` Peter Zijlstra
2019-11-04 10:12 ` Huang, Ying
2019-11-21 8:38 ` Huang, Ying
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