Re: [PATCH 0/2] Fix memcg/memory.high in case kmem accounting is enabled

From: Christoph Lameter
Date: Mon Aug 31 2015 - 16:22:28 EST

On Mon, 31 Aug 2015, Vladimir Davydov wrote:

> I totally agree that we should strive to make a kmem user feel roughly
> the same in memcg as if it were running on a host with equal amount of
> RAM. There are two ways to achieve that:
> 1. Make the API functions, i.e. kmalloc and friends, behave inside
> memcg roughly the same way as they do in the root cgroup.
> 2. Make the internal memcg functions, i.e. try_charge and friends,
> behave roughly the same way as alloc_pages.
> I find way 1 more flexible, because we don't have to blindly follow
> heuristics used on global memory reclaim and therefore have more
> opportunities to achieve the same goal.

The heuristics need to integrate well if its in a cgroup or not. In
general make use of cgroups as transparent as possible to the rest of the

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