From 1a822dbe19ab6634ffb2c0d3ce92b27b503e1612 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michal=20Sekleta=CC=81r?= <msekleta@redhat.com>
Date: Mon, 17 Feb 2020 13:50:31 +0100
Subject: [PATCH] core: add support for setting CPUAffinity= to special "numa"
value
systemd will automatically derive CPU affinity mask from NUMA node
mask.
Fixes #13248
(cherry picked from commit e2b2fb7f566d13a3de61952b5356cd4d2eaee917)
Resolves: #1740657
---
man/systemd.exec.xml | 9 +++---
src/basic/cpu-set-util.c | 43 ++++++++++++++++++++++++--
src/basic/cpu-set-util.h | 1 +
src/core/dbus-execute.c | 30 +++++++++++++++++-
src/core/execute.c | 46 ++++++++++++++++++++++++++--
src/core/execute.h | 3 ++
src/core/load-fragment.c | 14 ++++++++-
src/shared/bus-unit-util.c | 9 ++++++
src/test/test-cpu-set-util.c | 6 ++--
test/TEST-36-NUMAPOLICY/testsuite.sh | 18 +++++++++++
10 files changed, 166 insertions(+), 13 deletions(-)
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index e2a5ede968..696438c4ef 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -706,10 +706,11 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
<term><varname>CPUAffinity=</varname></term>
<listitem><para>Controls the CPU affinity of the executed processes. Takes a list of CPU indices or ranges
- separated by either whitespace or commas. CPU ranges are specified by the lower and upper CPU indices separated
- by a dash. This option may be specified more than once, in which case the specified CPU affinity masks are
- merged. If the empty string is assigned, the mask is reset, all assignments prior to this will have no
- effect. See
+ separated by either whitespace or commas. Alternatively, takes a special "numa" value in which case systemd
+ automatically derives allowed CPU range based on the value of <varname>NUMAMask=</varname> option. CPU ranges
+ are specified by the lower and upper CPU indices separated by a dash. This option may be specified more than
+ once, in which case the specified CPU affinity masks are merged. If the empty string is assigned, the mask
+ is reset, all assignments prior to this will have no effect. See
<citerefentry><refentrytitle>sched_setaffinity</refentrytitle><manvolnum>2</manvolnum></citerefentry> for
details.</para></listitem>
</varlistentry>
diff --git a/src/basic/cpu-set-util.c b/src/basic/cpu-set-util.c
index 51752ad1a6..1922c95864 100644
--- a/src/basic/cpu-set-util.c
+++ b/src/basic/cpu-set-util.c
@@ -12,12 +12,14 @@
#include "cpu-set-util.h"
#include "dirent-util.h"
#include "extract-word.h"
+#include "fileio.h"
#include "fd-util.h"
#include "log.h"
#include "macro.h"
#include "missing.h"
#include "parse-util.h"
#include "stat-util.h"
+#include "stdio-util.h"
#include "string-util.h"
#include "string-table.h"
#include "strv.h"
@@ -179,7 +181,7 @@ int cpu_set_add_all(CPUSet *a, const CPUSet *b) {
return r;
}
- return 0;
+ return 1;
}
int parse_cpu_set_full(
@@ -264,7 +266,7 @@ int parse_cpu_set_extend(
if (!old->set) {
*old = cpuset;
cpuset = (CPUSet) {};
- return 0;
+ return 1;
}
return cpu_set_add_all(old, &cpuset);
@@ -417,6 +419,43 @@ int apply_numa_policy(const NUMAPolicy *policy) {
return 0;
}
+int numa_to_cpu_set(const NUMAPolicy *policy, CPUSet *ret) {
+ int r;
+ size_t i;
+ _cleanup_(cpu_set_reset) CPUSet s = {};
+
+ assert(policy);
+ assert(ret);
+
+ for (i = 0; i < policy->nodes.allocated * 8; i++) {
+ _cleanup_free_ char *l = NULL;
+ char p[STRLEN("/sys/devices/system/node/node//cpulist") + DECIMAL_STR_MAX(size_t) + 1];
+ _cleanup_(cpu_set_reset) CPUSet part = {};
+
+ if (!CPU_ISSET_S(i, policy->nodes.allocated, policy->nodes.set))
+ continue;
+
+ xsprintf(p, "/sys/devices/system/node/node%zu/cpulist", i);
+
+ r = read_one_line_file(p, &l);
+ if (r < 0)
+ return r;
+
+ r = parse_cpu_set(l, &part);
+ if (r < 0)
+ return r;
+
+ r = cpu_set_add_all(&s, &part);
+ if (r < 0)
+ return r;
+ }
+
+ *ret = s;
+ s = (CPUSet) {};
+
+ return 0;
+}
+
static const char* const mpol_table[] = {
[MPOL_DEFAULT] = "default",
[MPOL_PREFERRED] = "preferred",
diff --git a/src/basic/cpu-set-util.h b/src/basic/cpu-set-util.h
index 8519a9b6c8..795be807af 100644
--- a/src/basic/cpu-set-util.h
+++ b/src/basic/cpu-set-util.h
@@ -78,6 +78,7 @@ static inline void numa_policy_reset(NUMAPolicy *p) {
}
int apply_numa_policy(const NUMAPolicy *policy);
+int numa_to_cpu_set(const NUMAPolicy *policy, CPUSet *ret);
const char* mpol_to_string(int i) _const_;
int mpol_from_string(const char *s) _pure_;
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index d5acca384f..0fe4c14e48 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -58,6 +58,8 @@ static BUS_DEFINE_PROPERTY_GET2(property_get_ioprio_priority, "i", ExecContext,
static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_empty_string, "s", NULL);
static BUS_DEFINE_PROPERTY_GET_REF(property_get_syslog_level, "i", int, LOG_PRI);
static BUS_DEFINE_PROPERTY_GET_REF(property_get_syslog_facility, "i", int, LOG_FAC);
+static BUS_DEFINE_PROPERTY_GET(property_get_cpu_affinity_from_numa, "b", ExecContext, exec_context_get_cpu_affinity_from_numa);
+
static int property_get_environment_files(
sd_bus *bus,
@@ -215,6 +217,7 @@ static int property_get_cpu_affinity(
sd_bus_error *error) {
ExecContext *c = userdata;
+ _cleanup_(cpu_set_reset) CPUSet s = {};
_cleanup_free_ uint8_t *array = NULL;
size_t allocated;
@@ -222,7 +225,16 @@ static int property_get_cpu_affinity(
assert(reply);
assert(c);
- (void) cpu_set_to_dbus(&c->cpu_set, &array, &allocated);
+ if (c->cpu_affinity_from_numa) {
+ int r;
+
+ r = numa_to_cpu_set(&c->numa_policy, &s);
+ if (r < 0)
+ return r;
+ }
+
+ (void) cpu_set_to_dbus(c->cpu_affinity_from_numa ? &s : &c->cpu_set, &array, &allocated);
+
return sd_bus_message_append_array(reply, 'y', array, allocated);
}
@@ -743,6 +755,7 @@ const sd_bus_vtable bus_exec_vtable[] = {
SD_BUS_PROPERTY("CPUSchedulingPolicy", "i", property_get_cpu_sched_policy, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("CPUSchedulingPriority", "i", property_get_cpu_sched_priority, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("CPUAffinity", "ay", property_get_cpu_affinity, 0, SD_BUS_VTABLE_PROPERTY_CONST),
+ SD_BUS_PROPERTY("CPUAffinityFromNUMA", "b", property_get_cpu_affinity_from_numa, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("NUMAPolicy", "i", property_get_numa_policy, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("NUMAMask", "ay", property_get_numa_mask, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("TimerSlackNSec", "t", property_get_timer_slack_nsec, 0, SD_BUS_VTABLE_PROPERTY_CONST),
@@ -1639,6 +1652,20 @@ int bus_exec_context_set_transient_property(
return 1;
+ } else if (streq(name, "CPUAffinityFromNUMA")) {
+ int q;
+
+ r = sd_bus_message_read_basic(message, 'b', &q);
+ if (r < 0)
+ return r;
+
+ if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
+ c->cpu_affinity_from_numa = q;
+ unit_write_settingf(u, flags, name, "%s=%s", "CPUAffinity", "numa");
+ }
+
+ return 1;
+
} else if (streq(name, "NUMAPolicy")) {
int32_t type;
@@ -1653,6 +1680,7 @@ int bus_exec_context_set_transient_property(
c->numa_policy.type = type;
return 1;
+
} else if (streq(name, "IOSchedulingClass")) {
int32_t q;
diff --git a/src/core/execute.c b/src/core/execute.c
index 3c54ac1110..d528d08830 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -2750,6 +2750,33 @@ static int compile_suggested_paths(const ExecContext *c, const ExecParameters *p
static char *exec_command_line(char **argv);
+static int exec_context_cpu_affinity_from_numa(const ExecContext *c, CPUSet *ret) {
+ _cleanup_(cpu_set_reset) CPUSet s = {};
+ int r;
+
+ assert(c);
+ assert(ret);
+
+ if (!c->numa_policy.nodes.set) {
+ log_debug("Can't derive CPU affinity mask from NUMA mask because NUMA mask is not set, ignoring");
+ return 0;
+ }
+
+ r = numa_to_cpu_set(&c->numa_policy, &s);
+ if (r < 0)
+ return r;
+
+ cpu_set_reset(ret);
+
+ return cpu_set_add_all(ret, &s);
+}
+
+bool exec_context_get_cpu_affinity_from_numa(const ExecContext *c) {
+ assert(c);
+
+ return c->cpu_affinity_from_numa;
+}
+
static int exec_child(
Unit *unit,
const ExecCommand *command,
@@ -3012,11 +3039,26 @@ static int exec_child(
}
}
- if (context->cpu_set.set)
- if (sched_setaffinity(0, context->cpu_set.allocated, context->cpu_set.set) < 0) {
+ if (context->cpu_affinity_from_numa || context->cpu_set.set) {
+ _cleanup_(cpu_set_reset) CPUSet converted_cpu_set = {};
+ const CPUSet *cpu_set;
+
+ if (context->cpu_affinity_from_numa) {
+ r = exec_context_cpu_affinity_from_numa(context, &converted_cpu_set);
+ if (r < 0) {
+ *exit_status = EXIT_CPUAFFINITY;
+ return log_unit_error_errno(unit, r, "Failed to derive CPU affinity mask from NUMA mask: %m");
+ }
+
+ cpu_set = &converted_cpu_set;
+ } else
+ cpu_set = &context->cpu_set;
+
+ if (sched_setaffinity(0, cpu_set->allocated, cpu_set->set) < 0) {
*exit_status = EXIT_CPUAFFINITY;
return log_unit_error_errno(unit, errno, "Failed to set up CPU affinity: %m");
}
+ }
if (mpol_is_valid(numa_policy_get_type(&context->numa_policy))) {
r = apply_numa_policy(&context->numa_policy);
diff --git a/src/core/execute.h b/src/core/execute.h
index 86c1cee84c..62c6229621 100644
--- a/src/core/execute.h
+++ b/src/core/execute.h
@@ -152,6 +152,7 @@ struct ExecContext {
CPUSet cpu_set;
NUMAPolicy numa_policy;
+ bool cpu_affinity_from_numa;
ExecInput std_input;
ExecOutput std_output;
@@ -375,6 +376,8 @@ int exec_runtime_deserialize_compat(Unit *u, const char *key, const char *value,
void exec_runtime_deserialize_one(Manager *m, const char *value, FDSet *fds);
void exec_runtime_vacuum(Manager *m);
+bool exec_context_get_cpu_affinity_from_numa(const ExecContext *c);
+
const char* exec_output_to_string(ExecOutput i) _const_;
ExecOutput exec_output_from_string(const char *s) _pure_;
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 33fdb82754..740401a582 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -1251,13 +1251,25 @@ int config_parse_exec_cpu_affinity(const char *unit,
void *userdata) {
ExecContext *c = data;
+ int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
- return parse_cpu_set_extend(rvalue, &c->cpu_set, true, unit, filename, line, lvalue);
+ if (streq(rvalue, "numa")) {
+ c->cpu_affinity_from_numa = true;
+ cpu_set_reset(&c->cpu_set);
+
+ return 0;
+ }
+
+ r = parse_cpu_set_extend(rvalue, &c->cpu_set, true, unit, filename, line, lvalue);
+ if (r >= 0)
+ c->cpu_affinity_from_numa = false;
+
+ return r;
}
int config_parse_capability_set(
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index 7029aa5615..daa2c2dce5 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -26,6 +26,8 @@
#include "securebits-util.h"
#include "signal-util.h"
#include "socket-protocol-list.h"
+#include "socket-util.h"
+#include "stdio-util.h"
#include "string-util.h"
#include "syslog-util.h"
#include "terminal-util.h"
@@ -997,6 +999,13 @@ static int bus_append_execute_property(sd_bus_message *m, const char *field, con
_cleanup_free_ uint8_t *array = NULL;
size_t allocated;
+ if (eq && streq(eq, "numa")) {
+ r = sd_bus_message_append(m, "(sv)", "CPUAffinityFromNUMA", "b", true);
+ if (r < 0)
+ return bus_log_create_error(r);
+ return r;
+ }
+
r = parse_cpu_set(eq, &cpuset);
if (r < 0)
return log_error_errno(r, "Failed to parse %s value: %s", field, eq);
diff --git a/src/test/test-cpu-set-util.c b/src/test/test-cpu-set-util.c
index 136eaca82d..1b7be5df4e 100644
--- a/src/test/test-cpu-set-util.c
+++ b/src/test/test-cpu-set-util.c
@@ -218,12 +218,12 @@ static void test_parse_cpu_set_extend(void) {
log_info("/* %s */", __func__);
- assert_se(parse_cpu_set_extend("1 3", &c, true, NULL, "fake", 1, "CPUAffinity") == 0);
+ assert_se(parse_cpu_set_extend("1 3", &c, true, NULL, "fake", 1, "CPUAffinity") == 1);
assert_se(CPU_COUNT_S(c.allocated, c.set) == 2);
assert_se(s1 = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", s1);
- assert_se(parse_cpu_set_extend("4", &c, true, NULL, "fake", 1, "CPUAffinity") == 0);
+ assert_se(parse_cpu_set_extend("4", &c, true, NULL, "fake", 1, "CPUAffinity") == 1);
assert_se(CPU_COUNT_S(c.allocated, c.set) == 3);
assert_se(s2 = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", s2);
@@ -240,7 +240,7 @@ static void test_cpu_set_to_from_dbus(void) {
log_info("/* %s */", __func__);
- assert_se(parse_cpu_set_extend("1 3 8 100-200", &c, true, NULL, "fake", 1, "CPUAffinity") == 0);
+ assert_se(parse_cpu_set_extend("1 3 8 100-200", &c, true, NULL, "fake", 1, "CPUAffinity") == 1);
assert_se(s = cpu_set_to_string(&c));
log_info("cpu_set_to_string: %s", s);
assert_se(CPU_COUNT_S(c.allocated, c.set) == 104);
diff --git a/test/TEST-36-NUMAPOLICY/testsuite.sh b/test/TEST-36-NUMAPOLICY/testsuite.sh
index bffac4ffe6..7ccaa5b412 100755
--- a/test/TEST-36-NUMAPOLICY/testsuite.sh
+++ b/test/TEST-36-NUMAPOLICY/testsuite.sh
@@ -279,6 +279,18 @@ else
# Maks must be ignored
grep -E "set_mempolicy\((MPOL_LOCAL|0x4 [^,]*), NULL" $straceLog
+ echo "Unit file CPUAffinity=NUMA support"
+ writeTestUnitNUMAPolicy "bind" "0"
+ echo "CPUAffinity=numa" >> $testUnitNUMAConf
+ systemctl daemon-reload
+ systemctl start $testUnit
+ systemctlCheckNUMAProperties $testUnit "bind" "0"
+ pid=$(systemctl show --value -p MainPID $testUnit)
+ cpulist=$(cat /sys/devices/system/node/node0/cpulist)
+ affinity_systemd=$(systemctl show --value -p CPUAffinity $testUnit)
+ [ $cpulist = $affinity_systemd ]
+ pid1StopUnit $testUnit
+
echo "systemd-run NUMAPolicy support"
runUnit='numa-systemd-run-test.service'
@@ -309,6 +321,12 @@ else
systemd-run -p NUMAPolicy=local -p NUMAMask=0 --unit $runUnit sleep 1000
systemctlCheckNUMAProperties $runUnit "local" ""
pid1StopUnit $runUnit
+
+ systemd-run -p NUMAPolicy=local -p NUMAMask=0 -p CPUAffinity=numa --unit $runUnit sleep 1000
+ systemctlCheckNUMAProperties $runUnit "local" ""
+ systemctl cat $runUnit | grep -q 'CPUAffinity=numa'
+ pid1StopUnit $runUnit
+
fi
# Cleanup