From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Tue, 17 Apr 2018 08:44:14 +0200 From: Michal Hocko To: Vlastimil Babka Cc: Johannes Weiner , Minchan Kim , Roman Gushchin , linux-mm@kvack.org, Andrew Morton , Alexander Viro , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, lsf-pc@lists.linux-foundation.org Subject: Re: [PATCH 3/3] dcache: account external names as indirectly reclaimable memory Message-ID: <20180417064414.GX17484@dhcp22.suse.cz> References: <20180305133743.12746-5-guro@fb.com> <20180413133519.GA213834@rodete-laptop-imager.corp.google.com> <20180413135923.GT17484@dhcp22.suse.cz> <13f1f5b5-f3f8-956c-145a-4641fb996048@suse.cz> <20180413142821.GW17484@dhcp22.suse.cz> <20180413143716.GA5378@cmpxchg.org> <20180416114144.GK17484@dhcp22.suse.cz> <1475594b-c1ad-9625-7aeb-ad8ad385b793@suse.cz> <20180416122747.GM17484@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: [the head of the thread is http://lkml.kernel.org/r/08524819-14ef-81d0-fa90-d7af13c6b9d5@suse.cz] On Mon 16-04-18 21:57:50, Vlastimil Babka wrote: > On 04/16/2018 02:27 PM, Michal Hocko wrote: > > On Mon 16-04-18 14:06:21, Vlastimil Babka wrote: > >> > >> For example the percpu (and other) array caches... > >> > >>> maybe it will turn out that such a large > >>> portion of the chache would need to duplicate the state that a > >>> completely new cache would be more reasonable. > >> > >> I'm afraid that's the case, yes. > >> > >>> Is this worth exploring > >>> at least? I mean something like this should help with the fragmentation > >>> already AFAIU. Accounting would be just free on top. > >> > >> Yep. It could be also CONFIG_urable so smaller systems don't need to > >> deal with the memory overhead of this. > >> > >> So do we put it on LSF/MM agenda? > > > > If you volunteer to lead the discussion, then I do not have any > > objections. > > Sure, let's add the topic of SLAB_MINIMIZE_WASTE [1] as well. > > Something like "Supporting reclaimable kmalloc caches and large > non-buddy-sized objects in slab allocators" ? > > [1] https://marc.info/?l=linux-mm&m=152156671614796&w=2 OK, noted. -- Michal Hocko SUSE Labs