diff options
Diffstat (limited to 'man/systemd.resource-control.xml')
| -rw-r--r-- | man/systemd.resource-control.xml | 182 |
1 files changed, 84 insertions, 98 deletions
diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml index 4edb1a25a8..313a49a959 100644 --- a/man/systemd.resource-control.xml +++ b/man/systemd.resource-control.xml @@ -252,14 +252,15 @@ <term><varname>IOAccounting=</varname></term> <listitem> - <para>Turn on Block I/O accounting for this unit on unified - hierarchy. Takes a boolean argument. Note that turning on - block I/O accounting for one unit will also implicitly turn - it on for all units contained in the same slice and all for - its parent slices and the units contained therein. The - system default for this setting may be controlled with - <varname>DefaultIOAccounting=</varname> in + <para>Turn on Block I/O accounting for this unit, if the unified control group hierarchy is used on the + system. Takes a boolean argument. Note that turning on block I/O accounting for one unit will also implicitly + turn it on for all units contained in the same slice and all for its parent slices and the units contained + therein. The system default for this setting may be controlled with <varname>DefaultIOAccounting=</varname> + in <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <para>This setting is supported only if the unified control group hierarchy is used. Use + <varname>BlockIOAccounting=</varname> on systems using the legacy control group hierarchy.</para> </listitem> </varlistentry> @@ -268,15 +269,12 @@ <term><varname>StartupIOWeight=<replaceable>weight</replaceable></varname></term> <listitem> - <para>Set the default overall block I/O weight for the - executed processes on unified hierarchy. Takes a single - weight value (between 1 and 10000) to set the default block - I/O weight. This controls the <literal>io.weight</literal> - control group attribute, which defaults to 100. For details - about this control group attribute, see <ulink - url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>. - The available I/O bandwidth is split up among all units - within one slice relative to their block I/O weight.</para> + <para>Set the default overall block I/O weight for the executed processes, if the unified control group + hierarchy is used on the system. Takes a single weight value (between 1 and 10000) to set the default block + I/O weight. This controls the <literal>io.weight</literal> control group attribute, which defaults to + 100. For details about this control group attribute, see <ulink + url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>. The available I/O + bandwidth is split up among all units within one slice relative to their block I/O weight.</para> <para>While <varname>StartupIOWeight=</varname> only applies to the startup phase of the system, @@ -286,6 +284,10 @@ differently than during runtime.</para> <para>Implies <literal>IOAccounting=true</literal>.</para> + + <para>This setting is supported only if the unified control group hierarchy is used. Use + <varname>BlockIOWeight=</varname> and <varname>StartupBlockIOWeight=</varname> on systems using the legacy + control group hierarchy.</para> </listitem> </varlistentry> @@ -293,21 +295,19 @@ <term><varname>IODeviceWeight=<replaceable>device</replaceable> <replaceable>weight</replaceable></varname></term> <listitem> - <para>Set the per-device overall block I/O weight for the - executed processes on unified hierarchy. Takes a - space-separated pair of a file path and a weight value to - specify the device specific weight value, between 1 and - 10000. (Example: "/dev/sda 1000"). The file path may be - specified as path to a block device node or as any other - file, in which case the backing block device of the file - system of the file is determined. This controls the - <literal>io.weight</literal> control group attribute, which - defaults to 100. Use this option multiple times to set - weights for multiple devices. For details about this control - group attribute, see <ulink + <para>Set the per-device overall block I/O weight for the executed processes, if the unified control group + hierarchy is used on the system. Takes a space-separated pair of a file path and a weight value to specify + the device specific weight value, between 1 and 10000. (Example: "/dev/sda 1000"). The file path may be + specified as path to a block device node or as any other file, in which case the backing block device of the + file system of the file is determined. This controls the <literal>io.weight</literal> control group + attribute, which defaults to 100. Use this option multiple times to set weights for multiple devices. 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>IOAccounting=true</literal>.</para> + + <para>This setting is supported only if the unified control group hierarchy is used. Use + <varname>BlockIODeviceWeight=</varname> on systems using the legacy control group hierarchy.</para> </listitem> </varlistentry> @@ -316,27 +316,23 @@ <term><varname>IOWriteBandwidthMax=<replaceable>device</replaceable> <replaceable>bytes</replaceable></varname></term> <listitem> - <para>Set the per-device overall block I/O bandwidth maximum - limit for the executed processes on unified hierarchy. This - limit is not work-conserving and the executed processes are - not allowed to use more even if the device has idle - capacity. Takes a space-separated pair of a file path and a - bandwidth value (in bytes per second) to specify the device - specific bandwidth. The file path may be a path to a block - device node, or as any other file in which case the backing - block device of the file system of the file is used. If the - bandwidth is suffixed with K, M, G, or T, the specified - bandwidth is parsed as Kilobytes, Megabytes, Gigabytes, or - Terabytes, respectively, to the base of 1000. (Example: - "/dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0 5M"). This - controls the <literal>io.max</literal> control group - attributes. Use this option multiple times to set bandwidth - limits for multiple devices. For details about this control - group attribute, see <ulink + <para>Set the per-device overall block I/O bandwidth maximum limit for the executed processes, if the unified + control group hierarchy is used on the system. This limit is not work-conserving and the executed processes + are not allowed to use more even if the device has idle capacity. Takes a space-separated pair of a file + path and a bandwidth value (in bytes per second) to specify the device specific bandwidth. The file path may + be a path to a block device node, or as any other file in which case the backing block device of the file + system of the file is used. If the bandwidth is suffixed with K, M, G, or T, the specified bandwidth is + parsed as Kilobytes, Megabytes, Gigabytes, or Terabytes, respectively, to the base of 1000. (Example: + "/dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0 5M"). This controls the <literal>io.max</literal> control + group attributes. Use this option multiple times to set bandwidth limits for multiple devices. 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>IOAccounting=true</literal>.</para> + + <para>This setting is supported only if the unified control group hierarchy is used. Use + <varname>BlockIOAccounting=</varname> on systems using the legacy control group hierarchy.</para> </listitem> </varlistentry> @@ -344,16 +340,15 @@ <term><varname>BlockIOAccounting=</varname></term> <listitem> - <para>Use IOAccounting on unified hierarchy.</para> - - <para>Turn on Block I/O accounting for this unit. Takes a - boolean argument. Note that turning on block I/O accounting - for one unit will also implicitly turn it on for all units - contained in the same slice and all for its parent slices - and the units contained therein. The system default for this - setting may be controlled with + <para>Turn on Block I/O accounting for this unit, if the legacy control group hierarchy is used on the + system. Takes a boolean argument. Note that turning on block I/O accounting for one unit will also implicitly + turn it on for all units contained in the same slice and all for its parent slices and the units contained + therein. The system default for this setting may be controlled with <varname>DefaultBlockIOAccounting=</varname> in <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> + + <para>This setting is supported only if the legacy control group hierarchy is used. Use + <varname>IOAccounting=</varname> on systems using the unified control group hierarchy.</para> </listitem> </varlistentry> @@ -361,18 +356,13 @@ <term><varname>BlockIOWeight=<replaceable>weight</replaceable></varname></term> <term><varname>StartupBlockIOWeight=<replaceable>weight</replaceable></varname></term> - <listitem><para>Use IOWeight and StartupIOWeight on unified - hierarchy.</para> - - <para>Set the default overall block I/O weight for the - executed processes. Takes a single weight value (between 10 - and 1000) to set the default block I/O weight. This controls - the <literal>blkio.weight</literal> control group attribute, - which defaults to 500. For details about this control group - attribute, see <ulink + <listitem><para>Set the default overall block I/O weight for the executed processes, if the legacy control + group hierarchy is used on the system. Takes a single weight value (between 10 and 1000) to set the default + block I/O weight. This controls the <literal>blkio.weight</literal> control group attribute, which defaults to + 500. For details about this control group attribute, see <ulink url="https://www.kernel.org/doc/Documentation/cgroup-v1/blkio-controller.txt">blkio-controller.txt</ulink>. - The available I/O bandwidth is split up among all units within - one slice relative to their block I/O weight.</para> + The available I/O bandwidth is split up among all units within one slice relative to their block I/O + weight.</para> <para>While <varname>StartupBlockIOWeight=</varname> only applies to the startup phase of the system, @@ -383,31 +373,32 @@ <para>Implies <literal>BlockIOAccounting=true</literal>.</para> - </listitem> + + <para>This setting is supported only if the legacy control group hierarchy is used. Use + <varname>IOWeight=</varname> and <varname>StartupIOWeight=</varname> on systems using the unified control group + hierarchy.</para> + + </listitem> </varlistentry> <varlistentry> <term><varname>BlockIODeviceWeight=<replaceable>device</replaceable> <replaceable>weight</replaceable></varname></term> <listitem> - <para>Use IODeviceWeight on unified hierarchy.</para> - - <para>Set the per-device overall block I/O weight for the - executed processes. Takes a space-separated pair of a file - path and a weight value to specify the device specific - weight value, between 10 and 1000. (Example: "/dev/sda - 500"). The file path may be specified as path to a block - device node or as any other file, in which case the backing - block device of the file system of the file is - determined. This controls the - <literal>blkio.weight_device</literal> control group - attribute, which defaults to 1000. Use this option multiple - times to set weights for multiple devices. For details about - this control group attribute, see <ulink + <para>Set the per-device overall block I/O weight for the executed processes, if the legacy control group + hierarchy is used on the system. Takes a space-separated pair of a file path and a weight value to specify + the device specific weight value, between 10 and 1000. (Example: "/dev/sda 500"). The file path may be + specified as path to a block device node or as any other file, in which case the backing block device of the + file system of the file is determined. This controls the <literal>blkio.weight_device</literal> control group + attribute, which defaults to 1000. Use this option multiple times to set weights for multiple devices. For + details about this control group attribute, see <ulink url="https://www.kernel.org/doc/Documentation/cgroup-v1/blkio-controller.txt">blkio-controller.txt</ulink>.</para> <para>Implies <literal>BlockIOAccounting=true</literal>.</para> + + <para>This setting is supported only if the legacy control group hierarchy is used. Use + <varname>IODeviceWeight=</varname> on systems using the unified control group hierarchy.</para> </listitem> </varlistentry> @@ -416,30 +407,25 @@ <term><varname>BlockIOWriteBandwidth=<replaceable>device</replaceable> <replaceable>bytes</replaceable></varname></term> <listitem> - <para>Use IOReadBandwidthMax and IOWriteBandwidthMax on - unified hierarchy.</para> - - <para>Set the per-device overall block I/O bandwidth limit - for the executed processes. Takes a space-separated pair of - a file path and a bandwidth value (in bytes per second) to - specify the device specific bandwidth. The file path may be - a path to a block device node, or as any other file in which - case the backing block device of the file system of the file - is used. If the bandwidth is suffixed with K, M, G, or T, - the specified bandwidth is parsed as Kilobytes, Megabytes, - Gigabytes, or Terabytes, respectively, to the base of - 1000. (Example: - "/dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0 5M"). This - controls the <literal>blkio.throttle.read_bps_device</literal> and - <literal>blkio.throttle.write_bps_device</literal> control group - attributes. Use this option multiple times to set bandwidth - limits for multiple devices. For details about these control - group attributes, see <ulink + <para>Set the per-device overall block I/O bandwidth limit for the executed processes, if the legacy control + group hierarchy is used on the system. Takes a space-separated pair of a file path and a bandwidth value (in + bytes per second) to specify the device specific bandwidth. The file path may be a path to a block device + node, or as any other file in which case the backing block device of the file system of the file is used. If + the bandwidth is suffixed with K, M, G, or T, the specified bandwidth is parsed as Kilobytes, Megabytes, + Gigabytes, or Terabytes, respectively, to the base of 1000. (Example: + "/dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0 5M"). This controls the + <literal>blkio.throttle.read_bps_device</literal> and <literal>blkio.throttle.write_bps_device</literal> + control group attributes. Use this option multiple times to set bandwidth limits for multiple devices. For + details about these control group attributes, see <ulink url="https://www.kernel.org/doc/Documentation/cgroup-v1/blkio-controller.txt">blkio-controller.txt</ulink>. </para> <para>Implies <literal>BlockIOAccounting=true</literal>.</para> + + <para>This setting is supported only if the legacy control group hierarchy is used. Use + <varname>IOReadBandwidthMax=</varname> and <varname>IOWriteBandwidthMax=</varname> on systems using the + unified control group hierarchy.</para> </listitem> </varlistentry> |