From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Rapoport Date: Fri, 25 Jan 2019 19:25:04 +0000 Subject: Re: [RFC PATCH] x86, numa: always initialize all possible nodes Message-Id: <20190125192504.GG31519@rapoport-lnx> List-Id: References: <20190114082416.30939-1-mhocko@kernel.org> <20190124141727.GN4087@dhcp22.suse.cz> <20190124175144.GF13790@rapoport-lnx> <20190125104023.GI3560@dhcp22.suse.cz> In-Reply-To: <20190125104023.GI3560@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Michal Hocko Cc: linux-mm@kvack.org, Pingfan Liu , Dave Hansen , Peter Zijlstra , x86@kernel.org, Benjamin Herrenschmidt , Michael Ellerman , Tony Luck , linuxppc-dev@lists.ozlabs.org, linux-ia64@vger.kernel.org, LKML On Fri, Jan 25, 2019 at 11:40:23AM +0100, Michal Hocko wrote: > On Thu 24-01-19 19:51:44, Mike Rapoport wrote: > > On Thu, Jan 24, 2019 at 03:17:27PM +0100, Michal Hocko wrote: > > > a friendly ping for this. Does anybody see any problem with this > > > approach? > > > > FWIW, it looks fine to me. > > > > It'd just be nice to have a few more words in the changelog about *how* the > > x86 init was reworked ;-) > > Heh, I thought it was there but nope... It probably just existed in my > head. Sorry about that. What about the following paragraphs added? > " > The new code relies on the arch specific initialization to allocate all > possible NUMA nodes (including memory less) - numa_register_memblks in > this case. Generic code then initializes both zonelists (__build_all_zonelists) > and allocator internals (free_area_init_nodes) for all non-null pgdats > rather than online ones. > > For the x86 specific part also do not make new node online in alloc_node_data > because this is too early to know that. numa_register_memblks knows that > a node has some memory so it can make the node online appropriately. > init_memory_less_node hack can be safely removed altogether now. > " LGTM, thanks! > -- > Michal Hocko > SUSE Labs > -- Sincerely yours, Mike.