Messages in this thread | | | Date | Thu, 6 Mar 2014 16:13:37 -0500 | From | Tejun Heo <> | Subject | Re: [patch 09/11] mm, page_alloc: allow system oom handlers to use memory reserves |
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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@google.com>
Until consensus on the whole approach can be reached,
Nacked-by: Tejun Heo <tj@kernel.org>
Thanks.
-- tejun
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