From: Cody P Schafer <cody@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>,
Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Cody P Schafer <cody@linux.vnet.ibm.com>
Subject: [PATCH v3 4/4] memory_hotplug: use pgdat_resize_lock() in __offline_pages()
Date: Mon, 13 May 2013 16:13:07 -0700 [thread overview]
Message-ID: <1368486787-9511-5-git-send-email-cody@linux.vnet.ibm.com> (raw)
In-Reply-To: <1368486787-9511-1-git-send-email-cody@linux.vnet.ibm.com>
mmzone.h documents node_size_lock (which pgdat_resize_lock() locks) as
follows:
* Must be held any time you expect node_start_pfn, node_present_pages
* or node_spanned_pages stay constant. [...]
So actually hold it when we update node_present_pages in __offline_pages().
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
---
mm/memory_hotplug.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0bdca10..b59a695 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1582,7 +1582,11 @@ repeat:
/* removal success */
zone->managed_pages -= offlined_pages;
zone->present_pages -= offlined_pages;
+
+ pgdat_resize_lock(zone->zone_pgdat, &flags);
zone->zone_pgdat->node_present_pages -= offlined_pages;
+ pgdat_resize_unlock(zone->zone_pgdat, &flags);
+
totalram_pages -= offlined_pages;
init_per_zone_wmark_min();
--
1.8.2.2
--
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prev parent reply other threads:[~2013-05-13 23:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-13 23:13 [PATCH v3 0/4] misc patches related to resizing nodes & zones Cody P Schafer
2013-05-13 23:13 ` [PATCH v3 1/4] mm: fix comment referring to non-existent size_seqlock, change to span_seqlock Cody P Schafer
2013-05-13 23:13 ` [PATCH v3 2/4] mmzone: note that node_size_lock should be manipulated via pgdat_resize_lock() Cody P Schafer
2013-05-13 23:13 ` [PATCH v3 3/4] memory_hotplug: use pgdat_resize_lock() in online_pages() Cody P Schafer
2013-05-15 23:20 ` Andrew Morton
2013-05-16 21:05 ` David Rientjes
2013-05-13 23:13 ` Cody P Schafer [this message]
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