···

       
58
       
58
       
 
       
the top-level cgroup, so any service or session can exhaust all

     

       
59
       
59
       
 
       
available memory.  Per-cgroup memory limits can be specified in

     

       
60
       
60
       
 
       
<filename>configuration.nix</filename>; for instance, to limit

     

       
61
       
61
       
-
       
<literal>httpd.service</literal> to 512 MiB of RAM (excluding swap)

     

       
62
       
62
       
-
       
and 640 MiB of RAM (including swap):

     

       
61
       
61
       
+
       
<literal>httpd.service</literal> to 512 MiB of RAM (excluding swap):

     

       
63
       
62
       
 
       


     

       
64
       
63
       
 
       
<programlisting>

     

       
65
       
64
       
 
       
systemd.services.httpd.serviceConfig.MemoryLimit = "512M";

     

       
66
       
66
       
-
       
systemd.services.httpd.serviceConfig.ControlGroupAttribute = [ "memory.memsw.limit_in_bytes 640M" ];

     

       
67
       
65
       
 
       
</programlisting>

     

       
68
       
66
       
 
       


     

       
69
       
67
       
 
       
</para>

     
···

       
72
       
70
       
 
       
continuously updated list of all cgroups with their CPU and memory

     

       
73
       
71
       
 
       
usage.</para>

     

       
74
       
72
       
 
       


     

       
75
       
75
       
-
       
</chapter>
     

       
73
       
73
       
+
       
</chapter>