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Date: Wed, 6 Jan 2021 14:57:54 +0800
From: Huang Ying <ying.huang@...el.com>
To: Peter Zijlstra <peterz@...radead.org>, Mel Gorman <mgorman@...e.de>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Huang Ying <ying.huang@...el.com>
Subject: [PATCH -V8 3/3] NOT kernel/numactl: Support to enable Linux kernel NUMA balancing
A new API: numa_set_membind_balancing() is added to libnuma. It is
same as numa_set_membind() except that the Linux kernel NUMA balancing
will be enabled for the task if the feature is supported by the
kernel.
At the same time, a new option: --balancing (-b) is added to numactl.
Which can be used before the --membind/-m memory policy in the command
line. With it, the Linux kernel NUMA balancing will be enabled for
the process if --membind/-m is used and the feature is supported by
the kernel.
Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
---
libnuma.c | 14 ++++++++++++++
numa.3 | 15 +++++++++++++++
numa.h | 4 ++++
numactl.8 | 12 ++++++++++++
numactl.c | 17 ++++++++++++++---
numaif.h | 3 +++
versions.ldscript | 8 ++++++++
7 files changed, 70 insertions(+), 3 deletions(-)
diff --git a/libnuma.c b/libnuma.c
index 88f479b..f073c50 100644
--- a/libnuma.c
+++ b/libnuma.c
@@ -1064,6 +1064,20 @@ numa_set_membind_v2(struct bitmask *bmp)
make_internal_alias(numa_set_membind_v2);
+void
+numa_set_membind_balancing(struct bitmask *bmp)
+{
+ /* MPOL_F_NUMA_BALANCING: ignore if unsupported */
+ if (set_mempolicy(MPOL_BIND | MPOL_F_NUMA_BALANCING,
+ bmp->maskp, bmp->size + 1) < 0) {
+ if (errno == EINVAL) {
+ errno = 0;
+ numa_set_membind_v2(bmp);
+ } else
+ numa_error("set_mempolicy");
+ }
+}
+
/*
* copy a bitmask map body to a numa.h nodemask_t structure
*/
diff --git a/numa.3 b/numa.3
index 3e18098..af01c8f 100644
--- a/numa.3
+++ b/numa.3
@@ -80,6 +80,8 @@ numa \- NUMA policy library
.br
.BI "void numa_set_membind(struct bitmask *" nodemask );
.br
+.BI "void numa_set_membind_balancing(struct bitmask *" nodemask );
+.br
.B struct bitmask *numa_get_membind(void);
.sp
.BI "void *numa_alloc_onnode(size_t " size ", int " node );
@@ -538,6 +540,19 @@ that contains nodes other than those in the mask returned by
.IR numa_get_mems_allowed ()
will result in an error.
+.BR numa_set_membind_balancing ()
+sets the memory allocation mask and enable the Linux kernel NUMA
+balancing for the task if the feature is supported by the kernel.
+The task will only allocate memory from the nodes set in
+.IR nodemask .
+Passing an empty
+.I nodemask
+or a
+.I nodemask
+that contains nodes other than those in the mask returned by
+.IR numa_get_mems_allowed ()
+will result in an error.
+
.BR numa_get_membind ()
returns the mask of nodes from which memory can currently be allocated.
If the returned mask is equal to
diff --git a/numa.h b/numa.h
index bd1d676..5d8543a 100644
--- a/numa.h
+++ b/numa.h
@@ -192,6 +192,10 @@ void numa_set_localalloc(void);
/* Only allocate memory from the nodes set in mask. 0 to turn off */
void numa_set_membind(struct bitmask *nodemask);
+/* Only allocate memory from the nodes set in mask. Optimize page
+ placement with Linux kernel NUMA balancing if possible. 0 to turn off */
+void numa_set_membind_balancing(struct bitmask *bmp);
+
/* Return current membind */
struct bitmask *numa_get_membind(void);
diff --git a/numactl.8 b/numactl.8
index f3bb22b..7d52688 100644
--- a/numactl.8
+++ b/numactl.8
@@ -25,6 +25,8 @@ numactl \- Control NUMA policy for processes or shared memory
[
.B \-\-all
] [
+.B \-\-balancing
+] [
.B \-\-interleave nodes
] [
.B \-\-preferred node
@@ -168,6 +170,12 @@ but if memory cannot be allocated there fall back to other nodes.
This option takes only a single node number.
Relative notation may be used.
.TP
+.B \-\-balancing, \-b
+Enable Linux kernel NUMA balancing for the process if it is supported by kernel.
+This should only be used with
+.I \-\-membind, \-m
+only, otherwise ignored.
+.TP
.B \-\-show, \-s
Show NUMA policy settings of the current process.
.TP
@@ -278,6 +286,10 @@ numactl \-\-cpunodebind=0 \-\-membind=0,1 -- process -l
Run process as above, but with an option (-l) that would be confused with
a numactl option.
+numactl \-\-cpunodebind=0 \-\-balancing \-\-membind=0,1 process
+Run process on node 0 with memory allocated on node 0 and 1. Optimize the
+page placement with Linux kernel NUMA balancing mechanism if possible.
+
numactl \-\-cpunodebind=netdev:eth0 \-\-membind=netdev:eth0 network-server
Run network-server on the node of network device eth0 with its memory
also in the same node.
diff --git a/numactl.c b/numactl.c
index df9dbcb..5a9d2df 100644
--- a/numactl.c
+++ b/numactl.c
@@ -45,6 +45,7 @@ struct option opts[] = {
{"membind", 1, 0, 'm'},
{"show", 0, 0, 's' },
{"localalloc", 0,0, 'l'},
+ {"balancing", 0, 0, 'b'},
{"hardware", 0,0,'H' },
{"shm", 1, 0, 'S'},
@@ -65,9 +66,10 @@ struct option opts[] = {
void usage(void)
{
fprintf(stderr,
- "usage: numactl [--all | -a] [--interleave= | -i <nodes>] [--preferred= | -p <node>]\n"
- " [--physcpubind= | -C <cpus>] [--cpunodebind= | -N <nodes>]\n"
- " [--membind= | -m <nodes>] [--localalloc | -l] command args ...\n"
+ "usage: numactl [--all | -a] [--balancing | -b] [--interleave= | -i <nodes>]\n"
+ " [--preferred= | -p <node>] [--physcpubind= | -C <cpus>]\n"
+ " [--cpunodebind= | -N <nodes>] [--membind= | -m <nodes>]\n"
+ " [--localalloc | -l] command args ...\n"
" numactl [--show | -s]\n"
" numactl [--hardware | -H]\n"
" numactl [--length | -l <length>] [--offset | -o <offset>] [--shmmode | -M <shmmode>]\n"
@@ -90,6 +92,8 @@ void usage(void)
"all numbers and ranges can be made cpuset-relative with +\n"
"the old --cpubind argument is deprecated.\n"
"use --cpunodebind or --physcpubind instead\n"
+ "use --balancing | -b to enable Linux kernel NUMA balancing\n"
+ "for the process if it is supported by kernel\n"
"<length> can have g (GB), m (MB) or k (KB) suffixes\n");
exit(1);
}
@@ -338,6 +342,7 @@ int do_dump = 0;
int shmattached = 0;
int did_node_cpu_parse = 0;
int parse_all = 0;
+int numa_balancing = 0;
char *shmoption;
void check_cpubind(int flag)
@@ -431,6 +436,10 @@ int main(int ac, char **av)
nopolicy();
hardware();
exit(0);
+ case 'b': /* --balancing */
+ nopolicy();
+ numa_balancing = 1;
+ break;
case 'i': /* --interleave */
checknuma();
if (parse_all)
@@ -507,6 +516,8 @@ int main(int ac, char **av)
numa_set_bind_policy(1);
if (shmfd >= 0) {
numa_tonodemask_memory(shmptr, shmlen, mask);
+ } else if (numa_balancing) {
+ numa_set_membind_balancing(mask);
} else {
numa_set_membind(mask);
}
diff --git a/numaif.h b/numaif.h
index 91aa230..32c12c3 100644
--- a/numaif.h
+++ b/numaif.h
@@ -29,6 +29,9 @@ extern long move_pages(int pid, unsigned long count,
#define MPOL_LOCAL 4
#define MPOL_MAX 5
+/* Flags for set_mempolicy, specified in mode */
+#define MPOL_F_NUMA_BALANCING (1 << 13) /* Optimize with NUMA balancing if possible */
+
/* Flags for get_mem_policy */
#define MPOL_F_NODE (1<<0) /* return next il node or node of address */
/* Warning: MPOL_F_NODE is unsupported and
diff --git a/versions.ldscript b/versions.ldscript
index 23074a0..358eeeb 100644
--- a/versions.ldscript
+++ b/versions.ldscript
@@ -146,3 +146,11 @@ libnuma_1.4 {
local:
*;
} libnuma_1.3;
+
+# New interface for membind with NUMA balancing optimization
+libnuma_1.5 {
+ global:
+ numa_set_membind_balancing;
+ local:
+ *;
+} libnuma_1.4;
--
2.29.2
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