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