From: Hoan Tran <hoan@os.amperecomputing.com>
To: Baoquan He <bhe@redhat.com>
Cc: mmorana@amperecomputing.com,
Catalin Marinas <catalin.marinas@arm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Michal Hocko <mhocko@kernel.org>,
"open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
Paul Mackerras <paulus@samba.org>,
"H. Peter Anvin" <hpa@zytor.com>,
sparclinux@vger.kernel.org,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
linux-s390@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>,
x86@kernel.org, Mike Rapoport <rppt@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Ingo Molnar <mingo@redhat.com>, Vlastimil Babka <vbabka@suse.cz>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Pavel Tatashin <pavel.tatashin@microsoft.com>,
lho@amperecomputing.com, Vasily Gorbik <gor@linux.ibm.com>,
Will Deacon <will.deacon@arm.com>, Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
Oscar Salvador <osalvador@suse.de>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH v3 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA
Date: Fri, 3 Apr 2020 09:36:10 -0700 [thread overview]
Message-ID: <419b415c-6e34-cb87-88bc-f17f03acffcb@os.amperecomputing.com> (raw)
In-Reply-To: <20200403070904.GO2402@MiWiFi-R3L-srv>
Hi,
On 4/3/20 12:09 AM, Baoquan He wrote:
> On 04/02/20 at 09:46pm, Hoan Tran wrote:
>> Hi All,
>>
>> On 3/31/20 7:31 AM, Baoquan He wrote:
>>> On 03/31/20 at 04:21pm, 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.
>>>
>>> Thanks for your quick response and pointing out the rest suspect aspects,
>>> I will investigate what you mentioned, see if they impact.
>>
>> I would like to check if we still move on with my patch to remove
>> CONFIG_NODES_SPAN_OTHER_NODES and have another patch on top it?
>
> I think we would like to replace CONFIG_NODES_SPAN_OTHER_NODES with
> CONFIG_NUMA, and just let UMA return 0 as node id, as Michal replied in
> another mail. Anyway, your patch 2~5 are still needed to sit on top of
> the change of this new plan.
Got it. Thanks for quick response.
Regards
Hoan
>
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next prev parent reply other threads:[~2020-04-03 16:36 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 [this message]
2020-04-09 16:27 ` Mike Rapoport
2020-04-10 6:50 ` Baoquan He
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