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authorNathan Zimmer <nzimmer@sgi.com>2014-01-23 15:53:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:52 -0800
commitac13c4622bda2a9ff8f57bbbfeff48b2a42d0963 (patch)
treea4bc187bba86700f5cb732651bf2ea905632a6e0 /mm
parent354f17e1e2512018a603793cc133e2f296f6ebc6 (diff)
downloadop-kernel-dev-ac13c4622bda2a9ff8f57bbbfeff48b2a42d0963.zip
op-kernel-dev-ac13c4622bda2a9ff8f57bbbfeff48b2a42d0963.tar.gz
mm/memory_hotplug.c: move register_memory_resource out of the lock_memory_hotplug
We don't need to do register_memory_resource() under lock_memory_hotplug() since it has its own lock and doesn't make any callbacks. Also register_memory_resource return NULL on failure so we don't have anything to cleanup at this point. The reason for this rfc is I was doing some experiments with hotplugging of memory on some of our larger systems. While it seems to work, it can be quite slow. With some preliminary digging I found that lock_memory_hotplug is clearly ripe for breakup. It could be broken up per nid or something but it also covers the online_page_callback. The online_page_callback shouldn't be very hard to break out. Also there is the issue of various structures(wmarks come to mind) that are only updated under the lock_memory_hotplug that would need to be dealt with. Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com> Cc: Hedi <hedi@sgi.com> Cc: Mike Travis <travis@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory_hotplug.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a512a47..a650db2 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1107,17 +1107,18 @@ int __ref add_memory(int nid, u64 start, u64 size)
if (ret)
return ret;
- lock_memory_hotplug();
-
res = register_memory_resource(start, size);
ret = -EEXIST;
if (!res)
- goto out;
+ return ret;
{ /* Stupid hack to suppress address-never-null warning */
void *p = NODE_DATA(nid);
new_pgdat = !p;
}
+
+ lock_memory_hotplug();
+
new_node = !node_online(nid);
if (new_node) {
pgdat = hotadd_new_pgdat(nid, start);
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