RFR: 8170888: [linux] Experimental support for cgroup memory limits in container (ie Docker) environments

[David Holmes]

Thanks Kim!

Just need Karen to re-affirm.

David

On 12/12/2016 5:41 PM, Kim Barrett wrote:
>> On Dec 10, 2016, at 5:14 PM, David Holmes <david.holmes at oracle.com> wrote:
>>
>> Updated webrev at:
>>
>> http://cr.openjdk.java.net/~dholmes/8170888/webrev.v2/
>>
>> Now checks fscanf ret code. Plus fixed 'else' formatting.
>>
>> Thanks,
>> David
>> -----
>>
>> +       int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
>> +       if (ret == 1 && cgroup_max > 0) {
>> +         // If unlimited, cgroup_max will be a very large, but unspecified
>> +         // value, so use initial phys_mem as a limit
>> +         log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
>> +                            JULONG_FORMAT "MB) and initial phys_mem ("
>> +                            JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
>> +         phys_mem = MIN2(cgroup_max, phys_mem);
>> +       } else {
>> +         warning("Unable to read/parse cgroup memory limit from %s: %s",
>> +                 lim_file, errno != 0 ? strerror(errno) : "unknown error");
>> +       }
>>
>
> Looks good.
>