On 2012-8-22 14:15, Wen Congyang wrote:
> At 08/21/2012 08:51 PM, qiuxishi Wrote:
>> From: Xishi Qiu <qiuxishi@xxxxxxxxxx>
>>
>> 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 <qiuxishi@xxxxxxxxxx>
>> ---
>> 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.
>
Yes, you are right. Here is the new patch,
Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
---
mm/memory_hotplug.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index bc7e7a2..5f6997f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -973,8 +973,13 @@ repeat:
init_per_zone_wmark_min();
- if (!populated_zone(zone))
+ if (!populated_zone(zone)) {
zone_pcp_reset(zone);
+ mutex_lock(&zonelists_mutex);
+ build_all_zonelists(NULL, NULL);
+ mutex_unlock(&zonelists_mutex);
+ } else
+ zone_pcp_update(zone);
if (!node_present_pages(node)) {
node_clear_state(node, N_HIGH_MEMORY);
--
1.7.6.1
> And we have called drain_all_pages(), I think there is no need
> to call zone_pcp_update() here.
>
> Thanks
> Wen Congyang
>
In zone_pcp_update(), it calculates zone_batchsize() which does
not calculated in drain_all_pages().
Thanks
Xishi Qiu
>>
>> vm_total_pages = nr_free_pagecache_pages();
>> writeback_set_ratelimit();
>
>
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