On Fri, 14 Jun 2013, Roman Gushchin wrote: > But there is an actual problem, that this patch solves. > Sometimes I saw the following issue on some machines: > all CPUs are performing compaction, system time is about 80%, > system is completely unreliable. It occurs only on machines > with specific workload (distributed data storage system, so, > intensive disk i/o is performed). A system can fall into > this state fast and unexpectedly or by progressive degradation. Well that is not a slab allocator specific issue but related to compaction concurrency. Likely cache line contention is causing a severe slowday. But that issue could be triggered by any subsystem that does lots of memory allocations. I would suggest that we try to address the problem in the compaction logic rather than modifying allocators. Mel? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>