| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 18 Apr 2013 16:28:57 +0900
From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To: <mingo@...nel.org>, <hpa@...or.com>,
<srivatsa.bhat@...ux.vnet.ibm.com>, <akpm@...ux-foundation.org>
CC: <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
<linux-mm@...ck.org>
Subject: [Bug fix PATCH] 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.
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@...fujitsu.com>
---
drivers/base/cpu.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index fb10728..e9fac4d 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -25,6 +25,15 @@ EXPORT_SYMBOL_GPL(cpu_subsys);
static DEFINE_PER_CPU(struct device *, cpu_sys_devices);
#ifdef CONFIG_HOTPLUG_CPU
+static void change_cpu_under_node(struct cpu *cpu,
+ unsigned int from_nid, unsigned int to_nid)
+{
+ int cpuid = cpu->dev.id;
+ unregister_cpu_under_node(cpuid, from_nid);
+ register_cpu_under_node(cpuid, to_nid);
+ cpu->node_id = to_nid;
+}
+
static ssize_t show_online(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -39,17 +48,23 @@ static ssize_t __ref store_online(struct device *dev,
const char *buf, size_t count)
{
struct cpu *cpu = container_of(dev, struct cpu, dev);
+ int num = cpu->dev.id;
+ int from_nid, to_nid;
ssize_t ret;
cpu_hotplug_driver_lock();
switch (buf[0]) {
case '0':
- ret = cpu_down(cpu->dev.id);
+ ret = cpu_down(num);
if (!ret)
kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
break;
case '1':
- ret = cpu_up(cpu->dev.id);
+ from_nid = cpu_to_node(num);
+ ret = cpu_up(num);
+ to_nid = cpu_to_node(num);
+ if (from_nid != to_nid)
+ change_cpu_under_node(cpu, from_nid, to_nid);
if (!ret)
kobject_uevent(&dev->kobj, KOBJ_ONLINE);
break;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists