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pid1: add new kernel cmdline arg systemd.cpu_affinity=

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Let's allow configuration of the CPU affinity via the kernel cmdline,
overriding CPUAffinity= in /etc/systemd/system.conf

Prompted by:

https://lists.freedesktop.org/archives/systemd-devel/2019-November/043754.html
This commit is contained in:
Lennart Poettering 2019-11-26 09:46:00 +01:00
parent 6355715e5b
commit 68d58f3869
2 changed files with 20 additions and 0 deletions
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11
man/kernel-command-line.xml
View file

@ -393,6 +393,17 @@
</listitem>
</varlistentry>
<varlistentry>
<term><varname>systemd.cpu_affinity=</varname></term>
<listitem>
<para>Overrides the CPU affinity mask for the service manager and the default for all child
processes it forks. This takes precedence over <varname>CPUAffinity=</varname>, see
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>modules_load=</varname></term>
<term><varname>rd.modules_load=</varname></term>

9
src/core/main.c
View file

@ -475,6 +475,15 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
if (arg_default_timeout_start_usec <= 0)
arg_default_timeout_start_usec = USEC_INFINITY;
} else if (proc_cmdline_key_streq(key, "systemd.cpu_affinity")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = parse_cpu_set(value, &arg_cpu_affinity);
if (r < 0)
log_warning_errno(r, "Faile to parse CPU affinity mask '%s', ignoring: %m", value);
} else if (proc_cmdline_key_streq(key, "systemd.watchdog_device")) {
if (proc_cmdline_value_missing(key, value))