Messages in this thread | | | Date | Wed, 23 Jul 2014 14:53:12 +0400 | From | Vladimir Davydov <> | Subject | Re: [PATCH -mm 0/6] memcg: release memcg_cache_id on css offline |
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On Mon, Jul 21, 2014 at 03:47:10PM +0400, Vladimir Davydov wrote: > This patch set makes memcg release memcg_cache_id on css offline. This > way the memcg_caches arrays size will be limited by the number of alive > kmem-active memory cgroups, which is much better.
Hi Andrew,
While preparing the per-memcg slab shrinkers patch set, I realized that releasing memcg_cache_id on css offline is incorrect, because after css offline there still can be elements on per-memcg list_lrus, which are indexed by memcg_cache_id. We could re-parent them, but this is what we decided to avoid in order to keep things clean and simple. So it seems there's nothing we can do except keeping memcg_cache_ids till css free.
I wonder if we could reclaim memory from per memcg arrays (per memcg list_lrus, kmem_caches) on memory pressure. May be, we could use flex_array to achieve that.
Anyway, could you please drop the following patches from the mmotm tree (all this set except patch 1, which is a mere cleanup)?
memcg-release-memcg_cache_id-on-css-offline memcg-keep-all-children-of-each-root-cache-on-a-list memcg-add-pointer-to-owner-cache-to-memcg_cache_params memcg-make-memcg_cache_id-static slab-use-mem_cgroup_id-for-per-memcg-cache-naming
Sorry about the noise.
Thank you.
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