From: Mike Rapoport <rppt@linux.ibm.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Baoquan He <bhe@redhat.com>,
Hoan Tran <Hoan@os.amperecomputing.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Oscar Salvador <osalvador@suse.de>,
Pavel Tatashin <pavel.tatashin@microsoft.com>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"David S. Miller" <davem@davemloft.net>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
"open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org,
sparclinux@vger.kernel.org, x86@kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
lho@amperecomputing.com, mmorana@amperecomputing.com
Subject: Re: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA
Date: Thu, 9 Apr 2020 19:27:41 +0300 [thread overview]
Message-ID: <20200409162741.GA9387@linux.ibm.com> (raw)
In-Reply-To: <20200331142138.GL30449@dhcp22.suse.cz>
On Tue, Mar 31, 2020 at 04:21:38PM +0200, Michal Hocko wrote:
> On Tue 31-03-20 22:03:32, Baoquan He wrote:
> > Hi Michal,
> >
> > On 03/31/20 at 10:55am, Michal Hocko wrote:
> > > On Tue 31-03-20 11:14:23, Mike Rapoport wrote:
> > > > Maybe I mis-read the code, but I don't see how this could happen. In the
> > > > HAVE_MEMBLOCK_NODE_MAP=y case, free_area_init_node() calls
> > > > calculate_node_totalpages() that ensures that node->node_zones are entirely
> > > > within the node because this is checked in zone_spanned_pages_in_node().
> > >
> > > zone_spanned_pages_in_node does chech the zone boundaries are within the
> > > node boundaries. But that doesn't really tell anything about other
> > > potential zones interleaving with the physical memory range.
> > > zone->spanned_pages simply gives the physical range for the zone
> > > including holes. Interleaving nodes are essentially a hole
> > > (__absent_pages_in_range is going to skip those).
> > >
> > > That means that when free_area_init_core simply goes over the whole
> > > physical zone range including holes and that is why we need to check
> > > both for physical and logical holes (aka other nodes).
> > >
> > > The life would be so much easier if the whole thing would simply iterate
> > > over memblocks...
> >
> > The memblock iterating sounds a great idea. I tried with putting the
> > memblock iterating in the upper layer, memmap_init(), which is used for
> > boot mem only anyway. Do you think it's doable and OK? It yes, I can
> > work out a formal patch to make this simpler as you said. The draft code
> > is as below. Like this it uses the existing code and involves little change.
>
> Doing this would be a step in the right direction! I haven't checked the
> code very closely though. The below sounds way too simple to be truth I
> am afraid. First for_each_mem_pfn_range is available only for
> CONFIG_HAVE_MEMBLOCK_NODE_MAP (which is one of the reasons why I keep
> saying that I really hate that being conditional). Also I haven't really
> checked the deferred initialization path - I have a very vague
> recollection that it has been converted to the memblock api but I have
> happilly dropped all that memory.
The Baoquan's patch almost did it, at least for simple case of qemu with 2
nodes. It's only missing the adjustment to the size passed to
memmap_init_zone() as it may change because of clamping.
I've drafted something that removes HAVE_MEMBLOCK_NODE_MAP and added this
patch there [1]. For several memory configurations I could emulate with
qemu it worked.
I'm going to wait a bit to see of kbuild is happy and then I'll send the
patches.
Baoquan, I took liberty to add your SoB, hope you don't mind.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/log/?h=memblock/all-have-node-map
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 138a56c0f48f..558d421f294b 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -6007,14 +6007,6 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
> > * function. They do not exist on hotplugged memory.
> > */
> > if (context == MEMMAP_EARLY) {
> > - if (!early_pfn_valid(pfn)) {
> > - pfn = next_pfn(pfn);
> > - continue;
> > - }
> > - if (!early_pfn_in_nid(pfn, nid)) {
> > - pfn++;
> > - continue;
> > - }
> > if (overlap_memmap_init(zone, &pfn))
> > continue;
> > if (defer_init(nid, pfn, end_pfn))
> > @@ -6130,9 +6122,17 @@ static void __meminit zone_init_free_lists(struct zone *zone)
> > }
> >
> > void __meminit __weak memmap_init(unsigned long size, int nid,
> > - unsigned long zone, unsigned long start_pfn)
> > + unsigned long zone, unsigned long range_start_pfn)
> > {
> > - memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY, NULL);
> > + unsigned long start_pfn, end_pfn;
> > + unsigned long range_end_pfn = range_start_pfn + size;
> > + int i;
> > + for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
> > + start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn);
> > + end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn);
> > + if (end_pfn > start_pfn)
> > + memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY, NULL);
> > + }
> > }
> >
> > static int zone_batchsize(struct zone *zone)
>
> --
> Michal Hocko
> SUSE Labs
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2020-04-09 16:28 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-28 18:31 [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA Hoan Tran
2020-03-28 18:31 ` [PATCH v3 1/5] " Hoan Tran
2020-03-28 18:31 ` [PATCH v3 2/5] powerpc: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES Hoan Tran
2020-03-28 18:31 ` [PATCH v3 3/5] x86: " Hoan Tran
2020-03-28 18:31 ` [PATCH v3 4/5] sparc: " Hoan Tran
2020-03-28 18:31 ` [PATCH v3 5/5] s390: " Hoan Tran
2020-03-29 0:19 ` [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA Baoquan He
2020-03-30 7:44 ` Michal Hocko
2020-03-30 8:04 ` Baoquan He
2020-03-30 7:42 ` Michal Hocko
2020-03-30 8:16 ` Baoquan He
2020-03-30 8:28 ` Baoquan He
2020-03-30 9:21 ` Mike Rapoport
2020-03-30 9:58 ` Michal Hocko
2020-03-30 10:26 ` Mike Rapoport
2020-03-30 10:43 ` Baoquan He
2020-03-31 21:56 ` [PATCH RFC] mm: remove CONFIG_HAVE_MEMBLOCK_NODE_MAP (was: Re: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA) Mike Rapoport
2020-04-01 5:42 ` Baoquan He
2020-04-01 7:51 ` Mike Rapoport
2020-04-02 8:01 ` Michal Hocko
2020-04-09 14:41 ` Baoquan He
2020-04-09 15:33 ` Michal Hocko
2020-04-10 6:46 ` Baoquan He
2020-03-30 9:26 ` [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA Baoquan He
2020-03-30 17:51 ` Mike Rapoport
2020-03-30 18:23 ` Michal Hocko
2020-03-31 8:14 ` Mike Rapoport
2020-03-31 8:55 ` Michal Hocko
2020-03-31 14:03 ` Baoquan He
2020-03-31 14:21 ` Michal Hocko
2020-03-31 14:31 ` Baoquan He
2020-04-03 4:46 ` Hoan Tran
2020-04-03 7:09 ` Baoquan He
2020-04-03 16:36 ` Hoan Tran
2020-04-09 16:27 ` Mike Rapoport [this message]
2020-04-10 6:50 ` Baoquan He
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