mirror of
https://github.com/Jeffrey-Sardina/liberated-systemd.git
synced 2026-10-19 01:29:53 -05:00
Eric BoucherandZbigniew Jędrzejewski-Szmek
34127b7c4c
The root row in systemd-cgtop previously displayed whole-system RAM
usage read from /proc/meminfo (MemTotal - MemAvailable), not a cgroup
sum. This is a pragmatic fallback — the kernel intentionally does not
expose memory.current on the v2 root cgroup (see the existing
is_root_cgroup() comment about avoiding 'multiple truth about system
state'), so cgtop picked /proc/meminfo to fill the gap.
Nevertheless, that caued the '/' row to provide different information
than every other row in the table:
- All child rows: 'what is this cgroup charged for?' (anon + file
+ sock + shmem attributable to the cgroup).
- Root row: 'what is the whole system using?' (includes kernel
slab, vmalloc, pagetables, zram mem_used, and anything not
attributable to any cgroup).
On a typical desktop the root row can read ~10 GB while the sum of
direct children is ~5 GB, with no explanation visible in the tool
itself.
This commit:
1. Introduces --root-memory= command line option.
2. Flips the default for the root row to the sum of memory.current
over its direct children.
3. Adds a '/' interactive key that toggles between the two modes.
4. Updates the interactive help string ('?' / 'h'), the man page,
and the bash completion for the new option.
Inside a container (detect_container() > 0), is_root_cgroup() already
returns false, so none of this applies — the container's '/' still
reads memory.current from the namespaced cgroup as before.
Co-authored-by: Zbigniew Jędrzejewski-Szmek <zbyszek@amutable.com>
409 lines
16 KiB
XML
409 lines
16 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-cgtop"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-cgtop</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-cgtop</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-cgtop</refname>
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<refpurpose>Show top control groups by their resource usage</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-cgtop</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt">GROUP</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-cgtop</command> shows the top control
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groups of the local Linux control group hierarchy, ordered by
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their CPU, memory, or disk I/O load. The display is refreshed in
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regular intervals (by default every 1s), similar in style to
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<citerefentry project='man-pages'><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
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If a control group path is specified, shows only the services of
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the specified control group.</para>
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<para>If <command>systemd-cgtop</command> is not connected to a
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tty, no column headers are printed and the default is to only run
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one iteration. The <option>--iterations=</option> argument, if
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given, is honored. This mode is suitable for scripting.</para>
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<para>Resource usage is only accounted for control groups with the appropriate controllers turned on:
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<literal>memory</literal> controller for memory usage and <literal>io</literal> controller for disk I/O consumption.
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If resource monitoring for these resources is required, it is recommended to add the <varname>MemoryAccounting=1</varname>
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and <varname>IOAccounting=1</varname> settings in the unit files in question. See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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<para>The CPU load value can be between 0 and 100 times the number of
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processors the system has. For example, if the system has 8 processors,
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the CPU load value is going to be between 0% and 800%. The number of
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processors can be found in <literal>/proc/cpuinfo</literal>.</para>
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<para>To emphasize: unless <literal>MemoryAccounting=1</literal> and <literal>IOAccounting=1</literal>
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are enabled for the services in question, no resource accounting will be available for system services
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and the data shown by <command>systemd-cgtop</command> will be incomplete.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-p</option></term>
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<term><option>--order=path</option></term>
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<listitem><para>Order by control group
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path name.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-t</option></term>
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<term><option>--order=tasks</option></term>
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<listitem><para>Order by number of tasks/processes in the control group.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-c</option></term>
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<term><option>--order=cpu</option></term>
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<listitem><para>Order by CPU load.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-m</option></term>
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<term><option>--order=memory</option></term>
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<listitem><para>Order by memory usage.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-i</option></term>
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<term><option>--order=io</option></term>
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<listitem><para>Order by disk I/O load.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-b</option></term>
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<term><option>--batch</option></term>
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<listitem><para>Run in "batch" mode: do not accept input and
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run until the iteration limit set with
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<option>--iterations=</option> is exhausted or until killed.
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This mode could be useful for sending output from
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<command>systemd-cgtop</command> to other programs or to a
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file.</para>
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<xi:include href="version-info.xml" xpointer="v188"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--raw</option></term>
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<listitem><para>Format byte counts (as in memory usage and I/O metrics) and CPU time
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with raw numeric values rather than human-readable
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numbers.</para>
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<xi:include href="version-info.xml" xpointer="v221"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--cpu=percentage</option></term>
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<term><option>--cpu=time</option></term>
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<listitem><para>Controls whether the CPU usage is shown as
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percentage or time. By default, the CPU usage is shown as
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percentage. When the option is used without an argument, it is
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equivalent to <option>--cpu=time</option>. This setting may also
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be toggled at runtime by pressing the <keycap>%</keycap>
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key.</para>
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<xi:include href="version-info.xml" xpointer="v226"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-P</option></term>
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<listitem><para>Count only userspace processes instead of all
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tasks. By default, all tasks are counted: each kernel thread
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and each userspace thread individually. With this setting,
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kernel threads are excluded from the count and each userspace
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process only counts as one task, regardless of how many
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threads it consists of. This setting may also be toggled at
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runtime by pressing the <keycap>P</keycap> key. This option
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may not be combined with
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<option>-k</option>.</para>
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<xi:include href="version-info.xml" xpointer="v227"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-k</option></term>
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<listitem><para>Count only userspace processes and kernel
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threads instead of all tasks. By default, all tasks are
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counted: each kernel thread and each userspace thread
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individually. With this setting, kernel threads are included in
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the count and each userspace process only counts as one task,
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regardless of how many threads it consists of. This setting may
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also be toggled at runtime by pressing the <keycap>k</keycap>
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key. This option may not be combined with
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<option>-P</option>.</para>
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<xi:include href="version-info.xml" xpointer="v226"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--recursive=</option></term>
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<listitem><para>Controls whether the number of processes shown
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for a control group shall include all processes that are
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contained in any of the child control groups as well. Takes a
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boolean argument, which defaults to <literal>yes</literal>. If
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enabled, the processes in child control groups are included, if
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disabled, only the processes in the control group itself are
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counted. This setting may also be toggled at runtime by
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pressing the <keycap>r</keycap> key. Note that this setting
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only applies to process counting, i.e. when the
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<option>-P</option> or <option>-k</option> options are
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used. When all tasks are counted, setting this option to
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<literal>no</literal> is rejected with an error, as task counting
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is always recursive.</para>
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<xi:include href="version-info.xml" xpointer="v226"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-n</option></term>
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<term><option>--iterations=</option></term>
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<listitem><para>Perform only this many iterations. A value of
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0 indicates that the program should run
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indefinitely.</para>
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<xi:include href="version-info.xml" xpointer="v188"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-1</option></term>
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<listitem><para>A shortcut for <option>--iterations=1</option>.</para>
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<xi:include href="version-info.xml" xpointer="v238"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-d</option></term>
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<term><option>--delay=</option></term>
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<listitem><para>Specify refresh delay in seconds (or if one of
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<literal>ms</literal>, <literal>us</literal>,
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<literal>min</literal> is specified as unit in this time
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unit). This setting may also be increased and decreased at
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runtime by pressing the <keycap>+</keycap> and
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<keycap>-</keycap> keys.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--depth=</option></term>
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<listitem><para>Maximum control group tree traversal depth.
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Specifies how deep <command>systemd-cgtop</command> shall
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traverse the control group hierarchies. If 0 is specified,
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only the root group is monitored. For 1, only the first level
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of control groups is monitored, and so on. Defaults to
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3.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--root-memory=</option></term>
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<listitem><para>Selects how the root control group row (<literal>/</literal>)
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reports memory usage. Takes one of <literal>cgroup</literal> or
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<literal>system</literal>. When <literal>cgroup</literal> (the default)
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is used, the root row shows the sum of <filename>memory.current</filename>
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across its direct children, which matches the accounting semantics of
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every other row in the table. When <literal>system</literal> is used,
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the root row shows whole-system RAM usage
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(<literal>MemTotal - MemAvailable</literal> from
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<filename>/proc/meminfo</filename>), which additionally accounts for
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kernel slab, vmalloc, page tables, and other memory not attributable to
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any cgroup. This setting may also be toggled at runtime by pressing the
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<keycap>/</keycap> key.</para>
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<xi:include href="version-info.xml" xpointer="v263"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-M <replaceable>MACHINE</replaceable></option></term>
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<term><option>--machine=<replaceable>MACHINE</replaceable></option></term>
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<listitem><para>Limit control groups shown to the part
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corresponding to the container
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<replaceable>MACHINE</replaceable>.
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This option may not be used when a control group path is specified.</para>
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<xi:include href="version-info.xml" xpointer="v227"/></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Keys</title>
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<para><command>systemd-cgtop</command> is an interactive tool and
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may be controlled via user input using the following keys:</para>
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<variablelist>
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<varlistentry>
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<term><keycap>h</keycap></term>
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<listitem><para>Shows a short help text.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap function="space"/></term>
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<listitem><para>Immediately refresh output.</para>
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<xi:include href="version-info.xml" xpointer="v226"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>q</keycap></term>
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<listitem><para>Terminate the program.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>p</keycap></term>
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<term><keycap>t</keycap></term>
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<term><keycap>c</keycap></term>
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<term><keycap>m</keycap></term>
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<term><keycap>i</keycap></term>
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<listitem><para>Sort the control groups by path, number of
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tasks, CPU load, memory usage, or I/O load, respectively. This
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setting may also be controlled using the
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<option>--order=</option> command line
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switch.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>%</keycap></term>
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<listitem><para>Toggle between showing CPU time as time or
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percentage. This setting may also be controlled using the
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<option>--cpu=</option> command line switch.</para>
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<xi:include href="version-info.xml" xpointer="v201"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>/</keycap></term>
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<listitem><para>Toggle the root control group row between
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cgroup-sum accounting (default) and whole-system accounting from
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<filename>/proc/meminfo</filename>. This setting may also be
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controlled using the <option>--root-memory=</option> command line
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switch.</para>
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<xi:include href="version-info.xml" xpointer="v263"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>+</keycap></term>
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<term><keycap>-</keycap></term>
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<listitem><para>Increase or decrease refresh delay,
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respectively. This setting may also be controlled using the
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<option>--delay=</option> command line
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switch.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>P</keycap></term>
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<listitem><para>Toggle between counting all tasks, or only
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userspace processes. This setting may also be controlled using
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the <option>-P</option> command line switch (see
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above).</para>
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<xi:include href="version-info.xml" xpointer="v227"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>k</keycap></term>
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<listitem><para>Toggle between counting all tasks, or only
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userspace processes and kernel threads. This setting may also
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be controlled using the <option>-k</option> command line
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switch (see above).</para>
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<xi:include href="version-info.xml" xpointer="v226"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><keycap>r</keycap></term>
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<listitem><para>Toggle between recursively including or
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excluding processes in child control groups in control group
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process counts. This setting may also be controlled using the
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<option>--recursive=</option> command line switch. This key is
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not available if all tasks are counted, it is only available
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if processes are counted, as enabled with the
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<keycap>P</keycap> or <keycap>k</keycap>
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keys.</para>
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<xi:include href="version-info.xml" xpointer="v226"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure code
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otherwise.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
|
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd-cgls</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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<member><citerefentry project='man-pages'><refentrytitle>top</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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