Re: [PATCH] memory-hotplug: add build zonelists when offline pages
From: Wen Congyang <hidden>
Date: 2012-08-22 06:10:22
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At 08/21/2012 08:51 PM, qiuxishi Wrote:
quoted hunk ↗ jump to hunk
From: Xishi Qiu <redacted> online_pages() does build_all_zonelists() and zone_pcp_update(), I think offline_pages() should do it too. The node has no memory to allocate, so remove this node's zones form other nodes' zonelists. Signed-off-by: Xishi Qiu <redacted> --- mm/memory_hotplug.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-)diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index bc7e7a2..5172bd4 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c@@ -979,7 +979,11 @@ repeat: if (!node_present_pages(node)) { node_clear_state(node, N_HIGH_MEMORY); kswapd_stop(node); - } + mutex_lock(&zonelists_mutex); + build_all_zonelists(NODE_DATA(node), NULL);
The node is still onlined now, so there is no need to pass this node's pgdat to build_all_zonelists(). I think we should build all zonelists when the zone has no pages.
+ mutex_unlock(&zonelists_mutex); + } else + zone_pcp_update(zone);
There is more than one zone in a node. So the zone can have no pages when the node has some pages. And we have called drain_all_pages(), I think there is no need to call zone_pcp_update() here. Thanks Wen Congyang
vm_total_pages = nr_free_pagecache_pages(); writeback_set_ratelimit();
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