On Tue, Mar 04, 2014 at 07:59:35PM -0800, David Rientjes wrote: > The root memcg allows unlimited memory charging, so no memory may be > reserved for userspace oom handlers that are responsible for dealing > with system oom conditions. > > Instead, this memory must come from per-zone memory reserves. This > allows the memory allocation to succeed, and the memcg charge will > naturally succeed afterwards. > > This patch introduces per-zone oom watermarks that aren't really > watermarks in the traditional sense. The oom watermark is the root > memcg's oom reserve proportional to the size of the zone. When a page > allocation is done, the effective watermark is > > [min/low/high watermark] - [oom watermark] > > For the [min watermark] case, this is effectively the oom reserve. > However, it also adjusts the low and high watermark accordingly so > memory is actually only allocated from min reserves when appropriate. > > Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx> Until consensus on the whole approach can be reached, Nacked-by: Tejun Heo <tj@xxxxxxxxxx> Thanks. -- tejun -- 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>