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From 04f21709ff081a5f1a2b5ca746582a9c5c03db7f Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Fri, 8 Jun 2018 17:33:14 -0700
Subject: [PATCH] core: add MemoryMin
The kernel added support for a new cgroup memory controller knob memory.min in
bf8d5d52ffe8 ("memcg: introduce memory.min") which was merged during v4.18
merge window.
Add MemoryMin to support memory.min.
(cherry picked from commit 484226357789991de0b3363beb69258be06b4c92)
Resolves: #1763435
---
doc/TRANSIENT-SETTINGS.md | 1 +
man/systemd.resource-control.xml | 21 +++++++++++++++++++++
src/core/cgroup.c | 5 ++++-
src/core/cgroup.h | 1 +
src/core/dbus-cgroup.c | 7 +++++++
src/core/load-fragment-gperf.gperf.m4 | 1 +
src/core/load-fragment.c | 4 +++-
src/shared/bus-unit-util.c | 2 +-
src/systemctl/systemctl.c | 11 +++++++++--
9 files changed, 48 insertions(+), 5 deletions(-)
diff --git a/doc/TRANSIENT-SETTINGS.md b/doc/TRANSIENT-SETTINGS.md
index 0d2d3e9065..93865c0333 100644
--- a/doc/TRANSIENT-SETTINGS.md
+++ b/doc/TRANSIENT-SETTINGS.md
@@ -222,6 +222,7 @@ All cgroup/resource control settings are available for transient units
✓ AllowedCPUs=
✓ AllowedMemoryNodes=
✓ MemoryAccounting=
+✓ MemoryMin=
✓ MemoryLow=
✓ MemoryHigh=
✓ MemoryMax=
diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
index cfe19a6574..63a0c87565 100644
--- a/man/systemd.resource-control.xml
+++ b/man/systemd.resource-control.xml
@@ -265,6 +265,27 @@
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>MemoryMin=<replaceable>bytes</replaceable></varname></term>
+
+ <listitem>
+ <para>Specify the memory usage protection of the executed processes in this unit. If the memory usages of
+ this unit and all its ancestors are below their minimum boundaries, this unit's memory won't be reclaimed.</para>
+
+ <para>Takes a memory size in bytes. If the value is suffixed with K, M, G or T, the specified memory size is
+ parsed as Kilobytes, Megabytes, Gigabytes, or Terabytes (with the base 1024), respectively. Alternatively, a
+ percentage value may be specified, which is taken relative to the installed physical memory on the
+ system. This controls the <literal>memory.min</literal> control group attribute. For details about this
+ control group attribute, see <ulink
+ url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>.</para>
+
+ <para>Implies <literal>MemoryAccounting=true</literal>.</para>
+
+ <para>This setting is supported only if the unified control group hierarchy is used and disables
+ <varname>MemoryLimit=</varname>.</para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><varname>MemoryLow=<replaceable>bytes</replaceable></varname></term>
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index f8b351a65d..9d09c65453 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -220,6 +220,7 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
"%sStartupIOWeight=%" PRIu64 "\n"
"%sBlockIOWeight=%" PRIu64 "\n"
"%sStartupBlockIOWeight=%" PRIu64 "\n"
+ "%sMemoryMin=%" PRIu64 "\n"
"%sMemoryLow=%" PRIu64 "\n"
"%sMemoryHigh=%" PRIu64 "\n"
"%sMemoryMax=%" PRIu64 "\n"
@@ -246,6 +247,7 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
prefix, c->startup_io_weight,
prefix, c->blockio_weight,
prefix, c->startup_blockio_weight,
+ prefix, c->memory_min,
prefix, c->memory_low,
prefix, c->memory_high,
prefix, c->memory_max,
@@ -777,7 +779,7 @@ static void cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint6
}
static bool cgroup_context_has_unified_memory_config(CGroupContext *c) {
- return c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX || c->memory_swap_max != CGROUP_LIMIT_MAX;
+ return c->memory_min > 0 || c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX || c->memory_swap_max != CGROUP_LIMIT_MAX;
}
static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
@@ -1035,6 +1037,7 @@ static void cgroup_context_apply(
log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max);
}
+ cgroup_apply_unified_memory_limit(u, "memory.min", c->memory_min);
cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low);
cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
cgroup_apply_unified_memory_limit(u, "memory.max", max);
diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index 2ba57d3ded..5e1be87b20 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -95,6 +95,7 @@ struct CGroupContext {
LIST_HEAD(CGroupIODeviceLimit, io_device_limits);
LIST_HEAD(CGroupIODeviceLatency, io_device_latencies);
+ uint64_t memory_min;
uint64_t memory_low;
uint64_t memory_high;
uint64_t memory_max;
diff --git a/src/core/dbus-cgroup.c b/src/core/dbus-cgroup.c
index 4555b33b1f..6ce5984a02 100644
--- a/src/core/dbus-cgroup.c
+++ b/src/core/dbus-cgroup.c
@@ -353,6 +353,7 @@ const sd_bus_vtable bus_cgroup_vtable[] = {
SD_BUS_PROPERTY("BlockIOReadBandwidth", "a(st)", property_get_blockio_device_bandwidths, 0, 0),
SD_BUS_PROPERTY("BlockIOWriteBandwidth", "a(st)", property_get_blockio_device_bandwidths, 0, 0),
SD_BUS_PROPERTY("MemoryAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, memory_accounting), 0),
+ SD_BUS_PROPERTY("MemoryMin", "t", NULL, offsetof(CGroupContext, memory_min), 0),
SD_BUS_PROPERTY("MemoryLow", "t", NULL, offsetof(CGroupContext, memory_low), 0),
SD_BUS_PROPERTY("MemoryHigh", "t", NULL, offsetof(CGroupContext, memory_high), 0),
SD_BUS_PROPERTY("MemoryMax", "t", NULL, offsetof(CGroupContext, memory_max), 0),
@@ -661,6 +662,9 @@ int bus_cgroup_set_property(
if (streq(name, "MemoryAccounting"))
return bus_cgroup_set_boolean(u, name, &c->memory_accounting, CGROUP_MASK_MEMORY, message, flags, error);
+ if (streq(name, "MemoryMin"))
+ return bus_cgroup_set_memory(u, name, &c->memory_min, message, flags, error);
+
if (streq(name, "MemoryLow"))
return bus_cgroup_set_memory(u, name, &c->memory_low, message, flags, error);
@@ -676,6 +680,9 @@ int bus_cgroup_set_property(
if (streq(name, "MemoryLimit"))
return bus_cgroup_set_memory(u, name, &c->memory_limit, message, flags, error);
+ if (streq(name, "MemoryMinScale"))
+ return bus_cgroup_set_memory_scale(u, name, &c->memory_min, message, flags, error);
+
if (streq(name, "MemoryLowScale"))
return bus_cgroup_set_memory_scale(u, name, &c->memory_low, message, flags, error);
diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index 4defa82ac1..1c6e539f30 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -171,6 +171,7 @@ $1.StartupCPUShares, config_parse_cpu_shares, 0,
$1.CPUQuota, config_parse_cpu_quota, 0, offsetof($1, cgroup_context)
$1.CPUQuotaPeriodSec, config_parse_sec_def_infinity, 0, offsetof($1, cgroup_context.cpu_quota_period_usec)
$1.MemoryAccounting, config_parse_bool, 0, offsetof($1, cgroup_context.memory_accounting)
+$1.MemoryMin, config_parse_memory_limit, 0, offsetof($1, cgroup_context)
$1.MemoryLow, config_parse_memory_limit, 0, offsetof($1, cgroup_context)
$1.MemoryHigh, config_parse_memory_limit, 0, offsetof($1, cgroup_context)
$1.MemoryMax, config_parse_memory_limit, 0, offsetof($1, cgroup_context)
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 762b106007..d43b0f08f9 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -3096,7 +3096,9 @@ int config_parse_memory_limit(
}
}
- if (streq(lvalue, "MemoryLow"))
+ if (streq(lvalue, "MemoryMin"))
+ c->memory_min = bytes;
+ else if (streq(lvalue, "MemoryLow"))
c->memory_low = bytes;
else if (streq(lvalue, "MemoryHigh"))
c->memory_high = bytes;
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index ec45d6f86d..203c068d02 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -429,7 +429,7 @@ static int bus_append_cgroup_property(sd_bus_message *m, const char *field, cons
return 1;
}
- if (STR_IN_SET(field, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit", "TasksMax")) {
+ if (STR_IN_SET(field, "MemoryMin", "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit", "TasksMax")) {
if (isempty(eq) || streq(eq, "infinity")) {
r = sd_bus_message_append(m, "(sv)", field, "t", CGROUP_LIMIT_MAX);
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index 559e49f104..35ad20f510 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -3905,6 +3905,7 @@ typedef struct UnitStatusInfo {
/* CGroup */
uint64_t memory_current;
+ uint64_t memory_min;
uint64_t memory_low;
uint64_t memory_high;
uint64_t memory_max;
@@ -4284,12 +4285,17 @@ static void print_status_info(
printf(" Memory: %s", format_bytes(buf, sizeof(buf), i->memory_current));
- if (i->memory_low > 0 || i->memory_high != CGROUP_LIMIT_MAX ||
- i->memory_max != CGROUP_LIMIT_MAX || i->memory_swap_max != CGROUP_LIMIT_MAX ||
+ if (i->memory_min > 0 || i->memory_low > 0 ||
+ i->memory_high != CGROUP_LIMIT_MAX || i->memory_max != CGROUP_LIMIT_MAX ||
+ i->memory_swap_max != CGROUP_LIMIT_MAX ||
i->memory_limit != CGROUP_LIMIT_MAX) {
const char *prefix = "";
printf(" (");
+ if (i->memory_min > 0) {
+ printf("%smin: %s", prefix, format_bytes(buf, sizeof(buf), i->memory_min));
+ prefix = " ";
+ }
if (i->memory_low > 0) {
printf("%slow: %s", prefix, format_bytes(buf, sizeof(buf), i->memory_low));
prefix = " ";
@@ -5022,6 +5028,7 @@ static int show_one(
{ "Where", "s", NULL, offsetof(UnitStatusInfo, where) },
{ "What", "s", NULL, offsetof(UnitStatusInfo, what) },
{ "MemoryCurrent", "t", NULL, offsetof(UnitStatusInfo, memory_current) },
+ { "MemoryMin", "t", NULL, offsetof(UnitStatusInfo, memory_min) },
{ "MemoryLow", "t", NULL, offsetof(UnitStatusInfo, memory_low) },
{ "MemoryHigh", "t", NULL, offsetof(UnitStatusInfo, memory_high) },
{ "MemoryMax", "t", NULL, offsetof(UnitStatusInfo, memory_max) },
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