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man: update docs for MemoryZSwapMax=

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Anita Zhang 2022-11-21 22:36:37 -08:00 committed by Luca Boccassi
parent f4a49d1c58
commit 6ee27eb3ca
1 changed files with 20 additions and 3 deletions
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23
man/systemd.resource-control.xml
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@ -325,15 +325,32 @@
<varlistentry>
<term><varname>MemorySwapMax=<replaceable>bytes</replaceable></varname></term>
<term><varname>MemoryZSwapMax=<replaceable>bytes</replaceable></varname></term>
<listitem>
<para>Specify the absolute limit on (z)swap usage of the executed processes in this unit.</para>
<para>Specify the absolute limit on swap usage of the executed processes in this unit.</para>
<para>Takes a swap size in bytes. If the value is suffixed with K, M, G or T, the specified swap size is
parsed as Kilobytes, Megabytes, Gigabytes, or Terabytes (with the base 1024), respectively. If assigned the
special value <literal>infinity</literal>, no swap limit is applied. These settings control the
<literal>memory.(z)swap.max</literal> control group attributes. For details about these control group attributes,
<literal>memory.swap.max</literal> control group attribute. For details about this control group attribute,
see <ulink url="https://docs.kernel.org/admin-guide/cgroup-v2.html#memory-interface-files">Memory Interface Files</ulink>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>MemoryZSwapMax=<replaceable>bytes</replaceable></varname></term>
<listitem>
<para>Specify the absolute limit on zswap usage of the processes in this unit. Zswap is a lightweight compressed
cache for swap pages. It takes pages that are in the process of being swapped out and attempts to compress them into a
dynamically allocated RAM-based memory pool. If the limit specified is hit, no entries from this unit will be
stored in the pool until existing entries are faulted back or written out to disk. See the kernel's
<ulink url="https://www.kernel.org/doc/html/latest/admin-guide/mm/zswap.html">Zswap</ulink> documentation for more details.</para>
<para>Takes a size in bytes. If the value is suffixed with K, M, G or T, the specified size is
parsed as Kilobytes, Megabytes, Gigabytes, or Terabytes (with the base 1024), respectively. If assigned the
special value <literal>infinity</literal>, no limit is applied. These settings control the
<literal>memory.zswap.max</literal> control group attribute. For details about this control group attribute,
see <ulink url="https://docs.kernel.org/admin-guide/cgroup-v2.html#memory-interface-files">Memory Interface Files</ulink>.</para>
</listitem>
</varlistentry>