lkml.org 
[lkml]   [2012]   [Oct]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 9/9] memory-hotplug: allocate zone's pcp before onlining pages
Date
From: Wen Congyang <wency@cn.fujitsu.com>

We use __free_page() to put a page to buddy system when onlining pages.
__free_page() will store NR_FREE_PAGES in zone's pcp.vm_stat_diff, so we
should allocate zone's pcp before onlining pages, otherwise we will lose
some free pages.

CC: David Rientjes <rientjes@google.com>
CC: Jiang Liu <liuj97@gmail.com>
CC: Len Brown <len.brown@intel.com>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
CC: Christoph Lameter <cl@linux.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
mm/memory_hotplug.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index ec899a2..eb4c132 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -505,12 +505,16 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
* So, zonelist must be updated after online.
*/
mutex_lock(&zonelists_mutex);
- if (!populated_zone(zone))
+ if (!populated_zone(zone)) {
need_zonelists_rebuild = 1;
+ build_all_zonelists(NULL, zone);
+ }

ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
online_pages_range);
if (ret) {
+ if (need_zonelists_rebuild)
+ zone_pcp_reset(zone);
mutex_unlock(&zonelists_mutex);
printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n",
(unsigned long long) pfn << PAGE_SHIFT,
@@ -525,9 +529,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
zone->zone_pgdat->node_present_pages += onlined_pages;
if (onlined_pages) {
node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
- if (need_zonelists_rebuild)
- build_all_zonelists(NULL, zone);
- else
+ if (!need_zonelists_rebuild)
zone_pcp_update(zone);
}

--
1.7.1


\
 
 \ /
  Last update: 2012-10-19 09:21    [W:0.117 / U:0.776 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site