linux/drivers/base
Yasuaki Ishimatsu 3464046824 numa, cpu hotplug: change links of CPU and node when changing node number by onlining CPU
When booting x86 system contains memoryless node, node numbers of CPUs
on memoryless node were changed to nearest online node number by
init_cpu_to_node() because the node is not online.

In my system, node numbers of cpu#30-44 and 75-89 were changed from 2 to
0 as follows:

  $ numactl --hardware
  available: 2 nodes (0-1)
  node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 30 31 32 33 34 35 36 37 38 39 40
  41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 75 76 77 78 79 80 81 82
  83 84 85 86 87 88 89
  node 0 size: 32394 MB
  node 0 free: 27898 MB
  node 1 cpus: 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 60 61 62 63 64 65 66
  67 68 69 70 71 72 73 74
  node 1 size: 32768 MB
  node 1 free: 30335 MB

If we hot add memory to memoryless node and offine/online all CPUs on
the node, node numbers of these CPUs are changed to correct node numbers
by srat_detect_node() because the node become online.

In this case, node numbers of cpu#30-44 and 75-89 were changed from 0 to
2 in my system as follows:

  $ numactl --hardware
  available: 3 nodes (0-2)
  node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 45 46 47 48 49 50 51 52 53 54 55
  56 57 58 59
  node 0 size: 32394 MB
  node 0 free: 27218 MB
  node 1 cpus: 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 60 61 62 63 64 65 66
  67 68 69 70 71 72 73 74
  node 1 size: 32768 MB
  node 1 free: 30014 MB
  node 2 cpus: 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 75 76 77 78 79 80 81
  82 83 84 85 86 87 88 89
  node 2 size: 16384 MB
  node 2 free: 16384 MB

But "cpu to node" and "node to cpu" links were not changed as follows:

  $ ls /sys/devices/system/cpu/cpu30/|grep node
  node0
  $ ls /sys/devices/system/node/node0/|grep cpu30
  cpu30

"numactl --hardware" shows that cpu30 belongs to node 2.  But sysfs
links does not change.

This patch changes "cpu to node" and "node to cpu" links when node
number changed by onlining CPU.

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-29 15:54:39 -07:00
..
power PM / QoS: Avoid possible deadlock related to sysfs access 2013-04-02 01:25:24 +02:00
regmap regmap: Back out work buffer fix 2013-04-09 18:03:25 +01:00
Kconfig firmware: Make user-mode helper optional 2013-02-03 17:57:40 -08:00
Makefile drivers/pinctrl: grab default handles from device core 2013-01-23 16:39:51 +01:00
attribute_container.c drivers: base: Convert dev_printk(KERN_<LEVEL> to dev_<level>( 2012-10-30 17:38:43 -07:00
base.h driver core: move the deferred probe pointer into the private area 2012-03-08 12:17:22 -08:00
bus.c device: separate all subsys mutexes 2013-03-13 08:48:28 -07:00
class.c driver-core: constify data for class_find_device() 2013-02-06 12:18:56 -08:00
core.c driver core: handle user namespaces properly with the uid/gid devtmpfs change 2013-04-11 11:43:29 -07:00
cpu.c numa, cpu hotplug: change links of CPU and node when changing node number by onlining CPU 2013-04-29 15:54:39 -07:00
dd.c PM / Runtime: Idle devices asynchronously after probe|release 2013-04-11 12:42:52 -07:00
devres.c drivers: base: Convert dev_printk(KERN_<LEVEL> to dev_<level>( 2012-10-30 17:38:43 -07:00
devtmpfs.c driver core: handle user namespaces properly with the uid/gid devtmpfs change 2013-04-11 11:43:29 -07:00
dma-buf.c CHROMIUM: dma-buf: restore args on failure of dma_buf_mmap 2013-02-27 15:14:02 +05:30
dma-coherent.c drivers: dma-coherent: Fix typo in dma_mmap_from_coherent documentation 2012-10-23 14:05:32 +02:00
dma-contiguous.c drivers: cma: represent physical addresses as phys_addr_t 2012-12-11 09:28:09 +01:00
dma-mapping.c [media] dma-mapping: fix dma_common_get_sgtable() conditional compilation 2012-11-27 09:42:31 -02:00
driver.c driver core: don't trigger uevent after failure 2012-07-17 10:40:23 -07:00
firmware.c firmware: change firmware_kset to firmware_kobj 2008-01-24 20:40:23 -08:00
firmware_class.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
hypervisor.c drivers/base: Add export.h for EXPORT_SYMBOL/THIS_MODULE as required. 2011-10-31 19:31:38 -04:00
init.c driver-core: implement 'sysdev' functionality for regular devices and buses 2011-12-14 14:29:38 -08:00
isa.c dma-mapping: replace all DMA_24BIT_MASK macro with DMA_BIT_MASK(24) 2009-04-07 08:31:12 -07:00
map.c [PATCH] kobj_map semaphore to mutex conversion 2006-03-20 13:42:58 -08:00
memory.c mm: Remove unused parameter of pages_correctly_reserved() 2013-04-29 15:54:38 -07:00
module.c driver core: module.c: Use kasprintf 2010-05-21 09:37:29 -07:00
node.c drivers/base/node.c: switch to register_hotmemory_notifier() 2013-04-29 15:54:36 -07:00
pinctrl.c drivers/pinctrl: grab default handles from device core 2013-01-23 16:39:51 +01:00
platform.c driver core: platform.c: fix checkpatch errors and warnings 2013-03-29 09:10:55 -07:00
soc.c mode_t whack-a-mole: ->is_visible() returns umode_t... 2012-05-29 23:28:42 -04:00
syscore.c PM: Reintroduce dropped call to check_wakeup_irqs 2011-07-11 10:51:49 +02:00
topology.c cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem 2011-12-21 14:29:42 -08:00
transport_class.c drivers/base: transport_class explicitly requires EXPORT_SYMBOL 2011-10-31 19:31:15 -04:00