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Subject[PATCH] cpuset: update top cpuset's mems after adding a node
After adding a node into the machine, top cpuset's mems isn't updated.

By reviewing the code, we found that the update function
cpuset_track_online_nodes()
was invoked after node_states[N_ONLINE] changes. It is wrong because N_ONLINE
just means node has pgdat, and if node has/added memory, we use N_HIGH_MEMORY.
So, We should invoke the update function after node_states[N_HIGH_MEMORY]
changes, just like its commit says.

This patch fixes it. And we use notifier of memory hotplug instead of direct
calling of cpuset_track_online_nodes().

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>

---
include/linux/cpuset.h | 4 ----
kernel/cpuset.c | 19 ++++++++++++++++---
mm/memory_hotplug.c | 3 ---
3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 2691926..8e540d3 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -74,8 +74,6 @@ static inline int cpuset_do_slab_mem_spread(void)
return current->flags & PF_SPREAD_SLAB;
}

-extern void cpuset_track_online_nodes(void);
-
extern int current_cpuset_is_being_rebound(void);

extern void rebuild_sched_domains(void);
@@ -151,8 +149,6 @@ static inline int cpuset_do_slab_mem_spread(void)
return 0;
}

-static inline void cpuset_track_online_nodes(void) {}
-
static inline int current_cpuset_is_being_rebound(void)
{
return 0;
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 3e00526..909a548 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -36,6 +36,7 @@
#include <linux/list.h>
#include <linux/mempolicy.h>
#include <linux/mm.h>
+#include <linux/memory.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/namei.h>
@@ -2011,12 +2012,23 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
* Call this routine anytime after node_states[N_HIGH_MEMORY] changes.
* See also the previous routine cpuset_track_online_cpus().
*/
-void cpuset_track_online_nodes(void)
+static int cpuset_track_online_nodes(struct notifier_block *self,
+ unsigned long action, void *arg)
{
cgroup_lock();
- top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
- scan_for_empty_cpusets(&top_cpuset);
+ switch (action) {
+ case MEM_ONLINE:
+ top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
+ break;
+ case MEM_OFFLINE:
+ top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
+ scan_for_empty_cpusets(&top_cpuset);
+ break;
+ default:
+ break;
+ }
cgroup_unlock();
+ return NOTIFY_OK;
}
#endif

@@ -2032,6 +2044,7 @@ void __init cpuset_init_smp(void)
top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];

hotcpu_notifier(cpuset_track_online_cpus, 0);
+ hotplug_memory_notifier(cpuset_track_online_nodes, 10);
}

/**
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6837a10..b5b2b15 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -22,7 +22,6 @@
#include <linux/highmem.h>
#include <linux/vmalloc.h>
#include <linux/ioport.h>
-#include <linux/cpuset.h>
#include <linux/delay.h>
#include <linux/migrate.h>
#include <linux/page-isolation.h>
@@ -498,8 +497,6 @@ int add_memory(int nid, u64 start, u64 size)
/* we online node here. we can't roll back from here. */
node_set_online(nid);

- cpuset_track_online_nodes();
-
if (new_pgdat) {
ret = register_one_node(nid);
/*
--
1.5.3.8


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