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cpuset: update top cpuset's mems after adding a node

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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>
Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Paul Menage <menage@google.com
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miao Xie 2008-11-19 15:36:30 -08:00 committed by Linus Torvalds
parent ac97b9f9a2
commit f481891fdc
3 changed files with 16 additions and 10 deletions
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4
include/linux/cpuset.h
View file

@ -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;

19
kernel/cpuset.c
View file

@ -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>
@ -2015,12 +2016,23 @@ 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
@ -2036,6 +2048,7 @@ 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);
}
/**

3
mm/memory_hotplug.c
View file

@ -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);
/*