On Wed, Feb 24, 2016 at 05:17:56PM -0500, Rik van Riel wrote: > On Wed, 2016-02-24 at 14:15 -0800, David Rientjes wrote: > > On Wed, 24 Feb 2016, Rik van Riel wrote: > > > > > For multi page allocations smaller than PAGE_ALLOC_COSTLY_ORDER, > > > the kernel will do direct reclaim if compaction failed for any > > > reason. This worked fine when Linux systems had 128MB RAM, but > > > on my 24GB system I frequently see higher order allocations > > > free up over 3GB of memory, pushing all kinds of things into > > > swap, and slowing down applications. > > > > > > > Just curious, are these higher order allocations typically done by > > the > > slub allocator or where are they coming from? > > These are slab allocator ones, indeed. > > The allocations seem to be order 2 and 3, mostly > on behalf of the inode cache and alloc_skb.
Hello, Rik. Could you tell me the kernel version you tested? Commit 45eb00cd3a03 (mm/slub: don't wait for high-order page allocation) changes slub allocator's behaviour that high order allocation request by slub doesn't cause direct reclaim. Thanks.
