The patch titled
Subject: mm: only display online cpus of the numa node
has been added to the -mm tree. Its filename is
mm-only-dispaly-online-cpus-of-the-numa-node.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-only-dispaly-online-cpus-of-the-numa-node.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-only-dispaly-online-cpus-of-the-numa-node.patch
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From: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Subject: mm: only display online cpus of the numa node
When I executed numactl -H(which read
/sys/devices/system/node/nodeX/cpumap and display cpumask_of_node for each
node), but I got different result on X86 and arm64. For each numa node,
the former only displayed online CPUs, and the latter displayed all
possible CPUs. Unfortunately, both Linux documentation and numactl manual
have not described it clear.
I sent a mail to ask for help, and Michal Hocko replied that he preferred
to print online cpus because it doesn't really make much sense to bind
anything on offline nodes.
Link: http://lkml.kernel.org/r/1506678805-15392-2-git-send-email-thunder.leizhen@xxxxxxxxxx
Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Tianhong Ding <dingtianhong@xxxxxxxxxx>
Cc: Hanjun Guo <guohanjun@xxxxxxxxxx>
Cc: Libin <huawei.libin@xxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/node.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff -puN drivers/base/node.c~mm-only-dispaly-online-cpus-of-the-numa-node drivers/base/node.c
--- a/drivers/base/node.c~mm-only-dispaly-online-cpus-of-the-numa-node
+++ a/drivers/base/node.c
@@ -27,13 +27,21 @@ static struct bus_type node_subsys = {
static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
{
+ ssize_t n;
+ cpumask_var_t mask;
struct node *node_dev = to_node(dev);
- const struct cpumask *mask = cpumask_of_node(node_dev->dev.id);
/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
- return cpumap_print_to_pagebuf(list, buf, mask);
+ if (!alloc_cpumask_var(&mask, GFP_KERNEL))
+ return 0;
+
+ cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
+ n = cpumap_print_to_pagebuf(list, buf, mask);
+ free_cpumask_var(mask);
+
+ return n;
}
static inline ssize_t node_read_cpumask(struct device *dev,
_
Patches currently in -mm which might be from thunder.leizhen@xxxxxxxxxx are
mm-only-dispaly-online-cpus-of-the-numa-node.patch
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