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core: optionally, accept a percentage value for MemoryLimit= and related settings
If a percentage is used, it is taken relative to the installed RAM size. This should make it easier to write generic unit files that adapt to the local system.
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@ -228,9 +228,11 @@
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reclaimed as long as memory can be reclaimed from unprotected units.</para>
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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. This controls the
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<literal>memory.low</literal> control group attribute. For details about this control group attribute, see
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<ulink url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>.</para>
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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.low</literal> control group attribute. For details about this
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control group attribute, see <ulink
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url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>.</para>
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<para>Implies <literal>MemoryAccounting=true</literal>.</para>
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@ -247,7 +249,9 @@
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aggressively in such cases. This is the main mechanism to control memory usage of a unit.</para>
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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. If assigned the
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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. If assigned the
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special value <literal>infinity</literal>, no memory limit is applied. This controls the
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<literal>memory.high</literal> control group attribute. For details about this control group attribute, see
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<ulink url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>.</para>
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@ -268,8 +272,9 @@
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last line of defense.</para>
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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. If assigned the
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special value <literal>infinity</literal>, no memory limit is applied. This controls the
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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 system. If
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assigned the special value <literal>infinity</literal>, no memory limit is applied. This controls the
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<literal>memory.max</literal> control group attribute. For details about this control group attribute, see
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<ulink url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>.</para>
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@ -284,17 +289,14 @@
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<term><varname>MemoryLimit=<replaceable>bytes</replaceable></varname></term>
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<listitem>
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<para>Specify the limit on maximum memory usage of the
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executed processes. The limit specifies how much process and
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kernel memory can be used by tasks in this unit. Takes a
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memory size in bytes. If the value is suffixed with K, M, G
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or T, the specified memory size is parsed as Kilobytes,
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Megabytes, Gigabytes, or Terabytes (with the base 1024),
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respectively. If assigned the special value
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<literal>infinity</literal>, no memory limit is applied. This
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controls the <literal>memory.limit_in_bytes</literal>
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control group attribute. For details about this control
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group attribute, see <ulink
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<para>Specify the limit on maximum memory usage of the executed processes. The limit specifies how much
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process and kernel memory can be used by tasks in this unit. Takes a memory size in bytes. If the value is
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suffixed with K, M, G or T, the specified memory size is parsed as Kilobytes, Megabytes, Gigabytes, or
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Terabytes (with the base 1024), respectively. Alternatively, a percentage value may be specified, which is
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taken relative to the installed physical memory on the system. If assigned the special value
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<literal>infinity</literal>, no memory limit is applied. This controls the
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<literal>memory.limit_in_bytes</literal> control group attribute. For details about this control group
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attribute, see <ulink
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url="https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt">memory.txt</ulink>.</para>
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<para>Implies <literal>MemoryAccounting=true</literal>.</para>
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@ -2812,9 +2812,19 @@ int config_parse_memory_limit(
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int r;
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if (!isempty(rvalue) && !streq(rvalue, "infinity")) {
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r = parse_size(rvalue, 1024, &bytes);
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if (r < 0 || bytes < 1) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Memory limit '%s' invalid. Ignoring.", rvalue);
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r = parse_percent(rvalue);
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if (r < 0) {
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r = parse_size(rvalue, 1024, &bytes);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Memory limit '%s' invalid. Ignoring.", rvalue);
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return 0;
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}
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} else
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bytes = (((physical_memory() / page_size()) * (uint64_t) r) / 100) * page_size();
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if (bytes < 1) {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Memory limit '%s' too small. Ignoring.", rvalue);
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return 0;
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}
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}
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