[systemd-devel] test program won't stop after hitting MemoryLimit

[Jeremy_Fang at dell.com]

Dell - Internal Use - Confidential
 Hi All:

I am trying to test Resource Control of system by setting MemoryLimit on my Debian system. Unfortunately it won't work after my testing. Maybe I am not configuring right. Please let me know how to fix this.

Here is info for your reference:

1)      uname  -a
Linux OS10 3.16.7-ckt11 #1 SMP Thu Feb 4 13:32:12 PST 2016 x86_64 GNU/Linux

2)      my test program: keeping allocate 2k memory as shown below:
#include <stdio.h>
#include <stdlib.h>

main(int argc, char *argv[])
{
    int  size = 0, times = 0;
    char *buffer = NULL;

    size  = 2000;
    times = 1;
    while (1) {
        printf("size=%d, times=%d\n", size, times);
        buffer = malloc(size);
        if (buffer == NULL) {
            printf("out of memory\n");
            break;
        }
        else  {
                 printf("buffer=%p\n", buffer);
        }
        times++;
        sleep(3);
    }
}

3)      /lib/systemd/system/limits.slice
[Unit]
Description=Limited resources Slice
DefaultDependencies=no
Before=slices.target

[Slice]
MemoryAccounting=true
MemoryLimit=20K

4)       /lib/system/system/test.service

[Unit]
Description=My Test Service.
DefaultDependencies=no

[Service]
Slice=limits.slice
ExecStart=/tmp/test
KillSignal=SIGKILL
SuccessExitStatus=SIGKILL
FailureAction=reboot-force

# Resource Limitations
LimitCORE=infinity

5)       systemctl daemon-reload
6)      systemctl   restart limits.slice
7)      systemctl  start  test.service

I would like to see test program will be ended after running for a while keeping allocating 2K memory with configured MemroyLimit as 20K.
But it seems test program is keep running for a long time and it won't be stopped.

Here is the output of systemctl status test.service

test.service - Test Service.
   Loaded: loaded (/lib/systemd/system/test.service; static)
   Active: active (running) since Thu 2016-02-18 06:40:49 UTC; 2min 5s ago
Main PID: 2429 (test)
   CGroup: /limits.slice/test.service
           2429 /tmp/test

Feb 18 06:40:49 OS10 systemd[1]: Started Test Service..

Where does it go wrong or am I missing anything ?
Please help !

Thanks,

Jeremy



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