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Date: Thu, 7 Jun 2012 18:19:07 -0700 (PDT) From: Ron Chen <ron_chen_123@...oo.com> To: Linux Mailing List <linux-kernel@...r.kernel.org> Subject: memcg cgroup controller & sbrk interaction We are from the Open Grid Scheduler, which is the official Open Source Grid Engine. Open Grid Scheduler/ Grid Engine ( http://gridscheduler.sourceforge.net ) is used by many compute farms & HPC sites for job scheduling. In the next release, we are using cgroups to define a Job Container interface for batch jobs: http://blogs.scalablelogic.com/2012/05/grid-engine-cgroups-integration.html However, not only us, but others have found that the memcg controller does not cause sbrk(2) or mmap(2) to return error when the cgroup is under high memory pressure. Further, when the amount of free memory is really low, the Linux Kernel OOM killer picks something and kills it. http://www.spinics.net/lists/cgroups/msg02622.html We also would like to see if it is technically possible for the Virtual Memory Manager to interact with the memory controller properly and give us the semantics of setrlimit(2). So basically if the current address space usage exceeds the "memory.memsw.limit_in_bytes" limit defined by the administrator, then the memory allocation system calls (example: mmap(2), sbrk(2), etc) will return error such that the OOM killer is not invoked. Thanks in advance. -Ron -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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