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Fri, 21 Jun 2019 18:25:05 +0000 (UTC) Subject: Re: [PATCH v3 0/6] mm: Further memory block device cleanups To: Qian Cai , linux-kernel@vger.kernel.org References: <20190620183139.4352-1-david@redhat.com> <1561130120.5154.47.camel@lca.pw> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwX4EEwECACgFAljj9eoCGwMFCQlmAYAGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEE3eEPcA/4Na5IIP/3T/FIQMxIfNzZshIq687qgG 8UbspuE/YSUDdv7r5szYTK6KPTlqN8NAcSfheywbuYD9A4ZeSBWD3/NAVUdrCaRP2IvFyELj xoMvfJccbq45BxzgEspg/bVahNbyuBpLBVjVWwRtFCUEXkyazksSv8pdTMAs9IucChvFmmq3 jJ2vlaz9lYt/lxN246fIVceckPMiUveimngvXZw21VOAhfQ+/sofXF8JCFv2mFcBDoa7eYob s0FLpmqFaeNRHAlzMWgSsP80qx5nWWEvRLdKWi533N2vC/EyunN3HcBwVrXH4hxRBMco3jvM m8VKLKao9wKj82qSivUnkPIwsAGNPdFoPbgghCQiBjBe6A75Z2xHFrzo7t1jg7nQfIyNC7ez MZBJ59sqA9EDMEJPlLNIeJmqslXPjmMFnE7Mby/+335WJYDulsRybN+W5rLT5aMvhC6x6POK z55fMNKrMASCzBJum2Fwjf/VnuGRYkhKCqqZ8gJ3OvmR50tInDV2jZ1DQgc3i550T5JDpToh dPBxZocIhzg+MBSRDXcJmHOx/7nQm3iQ6iLuwmXsRC6f5FbFefk9EjuTKcLMvBsEx+2DEx0E UnmJ4hVg7u1PQ+2Oy+Lh/opK/BDiqlQ8Pz2jiXv5xkECvr/3Sv59hlOCZMOaiLTTjtOIU7Tq 7ut6OL64oAq+zsFNBFXLn5EBEADn1959INH2cwYJv0tsxf5MUCghCj/CA/lc/LMthqQ773ga uB9mN+F1rE9cyyXb6jyOGn+GUjMbnq1o121Vm0+neKHUCBtHyseBfDXHA6m4B3mUTWo13nid 0e4AM71r0DS8+KYh6zvweLX/LL5kQS9GQeT+QNroXcC1NzWbitts6TZ+IrPOwT1hfB4WNC+X 2n4AzDqp3+ILiVST2DT4VBc11Gz6jijpC/KI5Al8ZDhRwG47LUiuQmt3yqrmN63V9wzaPhC+ xbwIsNZlLUvuRnmBPkTJwwrFRZvwu5GPHNndBjVpAfaSTOfppyKBTccu2AXJXWAE1Xjh6GOC 8mlFjZwLxWFqdPHR1n2aPVgoiTLk34LR/bXO+e0GpzFXT7enwyvFFFyAS0Nk1q/7EChPcbRb hJqEBpRNZemxmg55zC3GLvgLKd5A09MOM2BrMea+l0FUR+PuTenh2YmnmLRTro6eZ/qYwWkC u8FFIw4pT0OUDMyLgi+GI1aMpVogTZJ70FgV0pUAlpmrzk/bLbRkF3TwgucpyPtcpmQtTkWS gDS50QG9DR/1As3LLLcNkwJBZzBG6PWbvcOyrwMQUF1nl4SSPV0LLH63+BrrHasfJzxKXzqg rW28CTAE2x8qi7e/6M/+XXhrsMYG+uaViM7n2je3qKe7ofum3s4vq7oFCPsOgwARAQABwsFl BBgBAgAPBQJVy5+RAhsMBQkJZgGAAAoJEE3eEPcA/4NagOsP/jPoIBb/iXVbM+fmSHOjEshl KMwEl/m5iLj3iHnHPVLBUWrXPdS7iQijJA/VLxjnFknhaS60hkUNWexDMxVVP/6lbOrs4bDZ NEWDMktAeqJaFtxackPszlcpRVkAs6Msn9tu8hlvB517pyUgvuD7ZS9gGOMmYwFQDyytpepo YApVV00P0u3AaE0Cj/o71STqGJKZxcVhPaZ+LR+UCBZOyKfEyq+ZN311VpOJZ1IvTExf+S/5 lqnciDtbO3I4Wq0ArLX1gs1q1XlXLaVaA3yVqeC8E7kOchDNinD3hJS4OX0e1gdsx/e6COvy qNg5aL5n0Kl4fcVqM0LdIhsubVs4eiNCa5XMSYpXmVi3HAuFyg9dN+x8thSwI836FoMASwOl C7tHsTjnSGufB+D7F7ZBT61BffNBBIm1KdMxcxqLUVXpBQHHlGkbwI+3Ye+nE6HmZH7IwLwV W+Ajl7oYF+jeKaH4DZFtgLYGLtZ1LDwKPjX7VAsa4Yx7S5+EBAaZGxK510MjIx6SGrZWBrrV TEvdV00F2MnQoeXKzD7O4WFbL55hhyGgfWTHwZ457iN9SgYi1JLPqWkZB0JRXIEtjd4JEQcx +8Umfre0Xt4713VxMygW0PnQt5aSQdMD58jHFxTk092mU+yIHj5LeYgvwSgZN4airXk5yRXl SE+xAvmumFBY Organization: Red Hat GmbH Message-ID: <1c2edc22-afd7-2211-c4c7-40e54e5007e8@redhat.com> Date: Fri, 21 Jun 2019 20:24:59 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <1561130120.5154.47.camel@lca.pw> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Fri, 21 Jun 2019 18:25:16 +0000 (UTC) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Oscar Salvador , Michal Hocko , "Rafael J. Wysocki" , Wei Yang , Keith Busch , linux-mm@kvack.org, Arun KS , Rashmica Gupta , Thomas Gleixner , Stephen Rothwell , Michael Neuling , Baoquan He , Pavel Tatashin , linux-acpi@vger.kernel.org, Len Brown , Pavel Tatashin , Pavel Tatashin , Anshuman Khandual , "mike.travis@hpe.com" , linuxppc-dev@lists.ozlabs.org, Mike Rapoport , Dan Williams , Vlastimil Babka , Oscar Salvador , Juergen Gross , Andrew Banman , Greg Kroah-Hartman , "Rafael J. Wysocki" , Johannes Weiner , Paul Mackerras , Andrew Morton , Mel Gorman Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 21.06.19 17:15, Qian Cai wrote: > On Thu, 2019-06-20 at 20:31 +0200, David Hildenbrand wrote: >> @Andrew: Only patch 1, 4 and 6 changed compared to v1. >> >> Some further cleanups around memory block devices. Especially, clean up >> and simplify walk_memory_range(). Including some other minor cleanups. >> >> Compiled + tested on x86 with DIMMs under QEMU. Compile-tested on ppc64. >> >> v2 -> v3: >> - "mm/memory_hotplug: Rename walk_memory_range() and pass start+size .." >> -- Avoid warning on ppc. >> - "drivers/base/memory.c: Get rid of find_memory_block_hinted()" >> -- Fixup a comment regarding hinted devices. >> >> v1 -> v2: >> - "mm: Section numbers use the type "unsigned long"" >> -- "unsigned long i" -> "unsigned long nr", in one case -> "int i" >> - "drivers/base/memory.c: Get rid of find_memory_block_hinted(" >> -- Fix compilation error >> -- Get rid of the "hint" parameter completely >> >> David Hildenbrand (6): >>   mm: Section numbers use the type "unsigned long" >>   drivers/base/memory: Use "unsigned long" for block ids >>   mm: Make register_mem_sect_under_node() static >>   mm/memory_hotplug: Rename walk_memory_range() and pass start+size >>     instead of pfns >>   mm/memory_hotplug: Move and simplify walk_memory_blocks() >>   drivers/base/memory.c: Get rid of find_memory_block_hinted() >> >>  arch/powerpc/platforms/powernv/memtrace.c |  23 ++--- >>  drivers/acpi/acpi_memhotplug.c            |  19 +--- >>  drivers/base/memory.c                     | 120 +++++++++++++--------- >>  drivers/base/node.c                       |   8 +- >>  include/linux/memory.h                    |   5 +- >>  include/linux/memory_hotplug.h            |   2 - >>  include/linux/mmzone.h                    |   4 +- >>  include/linux/node.h                      |   7 -- >>  mm/memory_hotplug.c                       |  57 +--------- >>  mm/sparse.c                               |  12 +-- >>  10 files changed, 106 insertions(+), 151 deletions(-) >> > > This series causes a few machines are unable to boot triggering endless soft > lockups. Reverted those commits fixed the issue. > > 97f4217d1da0 Revert "mm/memory_hotplug: rename walk_memory_range() and pass > start+size instead of pfns" > c608eebf33c6 Revert "mm-memory_hotplug-rename-walk_memory_range-and-pass- > startsize-instead-of-pfns-fix" > 34b5e4ab7558 Revert "mm/memory_hotplug: move and simplify walk_memory_blocks()" > 59a9f3eec5d1 Revert "drivers/base/memory.c: Get rid of > find_memory_block_hinted()" > 5cfcd52288b6 Revert "drivers-base-memoryc-get-rid-of-find_memory_block_hinted- > v3" > > [    4.582081][    T1] ACPI FADT declares the system doesn't support PCIe ASPM, > so disable it > [    4.590405][    T1] ACPI: bus type PCI registered > [    4.592908][    T1] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem > 0x80000000-0x8fffffff] (base 0x80000000) > [    4.601860][    T1] PCI: MMCONFIG at [mem 0x80000000-0x8fffffff] reserved in > E820 > [    4.601860][    T1] PCI: Using configuration type 1 for base access > [   28.661336][   C16] watchdog: BUG: soft lockup - CPU#16 stuck for 22s! > [swapper/0:1] > [   28.671351][   C16] Modules linked in: > [   28.671354][   C16] CPU: 16 PID: 1 Comm: swapper/0 Not tainted 5.2.0-rc5- > next-20190621+ #1 > [   28.681366][   C16] Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 > Gen10, BIOS A40 03/09/2018 > [   28.691334][   C16] RIP: 0010:_raw_spin_unlock_irqrestore+0x2f/0x40 > [   28.701334][   C16] Code: 55 48 89 e5 41 54 49 89 f4 be 01 00 00 00 53 48 8b > 55 08 48 89 fb 48 8d 7f 18 e8 4c 89 7d ff 48 89 df e8 94 f9 7d ff 41 54 9d <65> > ff 0d c2 44 8d 48 5b 41 5c 5d c3 0f 1f 44 00 00 0f 1f 44 00 00 > [   28.711354][   C16] RSP: 0018:ffff888205b27bf8 EFLAGS: 00000246 ORIG_RAX: > ffffffffffffff13 > [   28.721372][   C16] RAX: 0000000000000000 RBX: ffff8882053d6138 RCX: > ffffffffb6f2a3b8 > [   28.731371][   C16] RDX: 1ffff11040a7ac27 RSI: dffffc0000000000 RDI: > ffff8882053d6138 > [   28.741371][   C16] RBP: ffff888205b27c08 R08: ffffed1040a7ac28 R09: > ffffed1040a7ac27 > [   28.751334][   C16] R10: ffffed1040a7ac27 R11: ffff8882053d613b R12: > 0000000000000246 > [   28.751370][   C16] R13: ffff888205b27c98 R14: ffff8884504d0a20 R15: > 0000000000000000 > [   28.761368][   C16] FS:  0000000000000000(0000) GS:ffff888454500000(0000) > knlGS:0000000000000000 > [   28.771373][   C16] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [   28.781334][   C16] CR2: 0000000000000000 CR3: 00000007c9012000 CR4: > 00000000001406a0 > [   28.791333][   C16] Call Trace: > [   28.791374][   C16]  klist_next+0xd8/0x1c0 > [   28.791374][   C16]  subsys_find_device_by_id+0x13b/0x1f0 > [   28.801334][   C16]  ? bus_find_device_by_name+0x20/0x20 > [   28.801370][   C16]  ? kobject_put+0x23/0x250 > [   28.811333][   C16]  walk_memory_blocks+0x6c/0xb8 > [   28.811353][   C16]  ? write_policy_show+0x40/0x40 > [   28.821334][   C16]  link_mem_sections+0x7e/0xa0 > [   28.821369][   C16]  ? unregister_memory_block_under_nodes+0x210/0x210 > [   28.831353][   C16]  ? __register_one_node+0x3bd/0x600 > [   28.831353][   C16]  topology_init+0xbf/0x126 > [   28.841364][   C16]  ? enable_cpu0_hotplug+0x1a/0x1a > [   28.841368][   C16]  do_one_initcall+0xfe/0x45a > [   28.851334][   C16]  ? initcall_blacklisted+0x150/0x150 > [   28.851353][   C16]  ? kasan_check_write+0x14/0x20 > [   28.861333][   C16]  ? up_write+0x75/0x140 > [   28.861369][   C16]  kernel_init_freeable+0x619/0x6ac > [   28.871333][   C16]  ? rest_init+0x188/0x188 > [   28.871353][   C16]  kernel_init+0x11/0x138 > [   28.881363][   C16]  ? rest_init+0x188/0x188 > [   28.881363][   C16]  ret_from_fork+0x22/0x40 > [   56.661336][   C16] watchdog: BUG: soft lockup - CPU#16 stuck for 22s! > [swapper/0:1] > [   56.671352][   C16] Modules linked in: > [   56.671354][   C16] CPU: 16 PID: 1 Comm: swapper/0 Tainted: > G             L    5.2.0-rc5-next-20190621+ #1 > [   56.681357][   C16] Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 > Gen10, BIOS A40 03/09/2018 > [   56.691356][   C16] RIP: 0010:subsys_find_device_by_id+0x168/0x1f0 > [   56.701334][   C16] Code: 48 85 c0 74 3e 48 8d 78 58 e8 14 77 ca ff 4d 8b 7e > 58 4d 85 ff 74 2c 49 8d bf a0 03 00 00 e8 bf 75 ca ff 45 39 a7 a0 03 00 00 <75> > c9 4c 89 ff e8 0e 89 ff ff 48 85 c0 74 bc 48 89 df e8 21 3b 24 > [   56.721333][   C16] RSP: 0018:ffff888205b27c68 EFLAGS: 00000287 ORIG_RAX: > ffffffffffffff13 > [   56.721370][   C16] RAX: 0000000000000000 RBX: ffff888205b27c90 RCX: > ffffffffb74c9dc1 > [   56.731370][   C16] RDX: 0000000000000003 RSI: dffffc0000000000 RDI: > ffff8888774ec3e0 > [   56.741371][   C16] RBP: ffff888205b27cf8 R08: ffffed1040a7ac28 R09: > ffffed1040a7ac27 > [   56.751335][   C16] R10: ffffed1040a7ac27 R11: ffff8882053d613b R12: > 0000000000085c1b > [   56.761334][   C16] R13: 1ffff11040b64f8e R14: ffff888450de4a20 R15: > ffff8888774ec040 > [   56.761372][   C16] FS:  0000000000000000(0000) GS:ffff888454500000(0000) > knlGS:0000000000000000 > [   56.771374][   C16] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [   56.781370][   C16] CR2: 0000000000000000 CR3: 00000007c9012000 CR4: > 00000000001406a0 > [   56.791373][   C16] Call Trace: > [   56.791373][   C16]  ? bus_find_device_by_name+0x20/0x20 > [   56.801334][   C16]  ? kobject_put+0x23/0x250 > [   56.801334][   C16]  walk_memory_blocks+0x6c/0xb8 > [   56.811333][   C16]  ? write_policy_show+0x40/0x40 > [   56.811353][   C16]  link_mem_sections+0x7e/0xa0 > [   56.811353][   C16]  ? unregister_memory_block_under_nodes+0x210/0x210 > [   56.821333][   C16]  ? __register_one_node+0x3bd/0x600 > [   56.831333][   C16]  topology_init+0xbf/0x126 > [   56.831355][   C16]  ? enable_cpu0_hotplug+0x1a/0x1a > [   56.841334][   C16]  do_one_initcall+0xfe/0x45a > [   56.841334][   C16]  ? initcall_blacklisted+0x150/0x150 > [   56.851333][   C16]  ? kasan_check_write+0x14/0x20 > [   56.851354][   C16]  ? up_write+0x75/0x140 > [   56.861333][   C16]  kernel_init_freeable+0x619/0x6ac > [   56.861333][   C16]  ? rest_init+0x188/0x188 > [   56.861369][   C16]  kernel_init+0x11/0x138 > [   56.871333][   C16]  ? rest_init+0x188/0x188 > [   56.871354][   C16]  ret_from_fork+0x22/0x40 > [   64.601362][   C16] rcu: INFO: rcu_sched self-detected stall on CPU > [   64.611335][   C16] rcu:  16-....: (5958 ticks this GP) > idle=37e/1/0x4000000000000002 softirq=27/27 fqs=3000  > [   64.621334][   C16]  (t=6002 jiffies g=-1079 q=25) > [   64.621334][   C16] NMI backtrace for cpu 16 > [   64.621374][   C16] CPU: 16 PID: 1 Comm: swapper/0 Tainted: > G             L    5.2.0-rc5-next-20190621+ #1 > [   64.631372][   C16] Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 > Gen10, BIOS A40 03/09/2018 > [   64.641371][   C16] Call Trace: > [   64.651337][   C16]   > [   64.651376][   C16]  dump_stack+0x62/0x9a > [   64.651376][   C16]  nmi_cpu_backtrace.cold.0+0x2e/0x33 > [   64.661337][   C16]  ? nmi_cpu_backtrace_handler+0x20/0x20 > [   64.661337][   C16]  nmi_trigger_cpumask_backtrace+0x1a6/0x1b9 > [   64.671353][   C16]  arch_trigger_cpumask_backtrace+0x19/0x20 > [   64.681366][   C16]  rcu_dump_cpu_stacks+0x18b/0x1d6 > [   64.681366][   C16]  rcu_sched_clock_irq.cold.64+0x368/0x791 > [   64.691336][   C16]  ? kasan_check_read+0x11/0x20 > [   64.691354][   C16]  ? __raise_softirq_irqoff+0x66/0x150 > [   64.701336][   C16]  update_process_times+0x2f/0x60 > [   64.701362][   C16]  tick_periodic+0x38/0xe0 > [   64.711334][   C16]  tick_handle_periodic+0x2e/0x80 > [   64.711353][   C16]  smp_apic_timer_interrupt+0xfb/0x370 > [   64.721367][   C16]  apic_timer_interrupt+0xf/0x20 > [   64.721367][   C16]   > [   64.721367][   C16] RIP: 0010:_raw_spin_unlock_irqrestore+0x2f/0x40 > [   64.731370][   C16] Code: 55 48 89 e5 41 54 49 89 f4 be 01 00 00 00 53  > @Qian Cai, unfortunately I can't reproduce. If you get the chance, it would be great if you could retry with diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 972c5336bebf..742f99ddd148 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -868,6 +868,9 @@ int walk_memory_blocks(unsigned long start, unsigned long size, unsigned long block_id; int ret = 0; + if (!size) + return; + for (block_id = start_block_id; block_id <= end_block_id; block_id++) { mem = find_memory_block_by_id(block_id); if (!mem) If both, start and size are 0, we would get a veeeery long loop. This would mean that we have an online node that does not span any pages at all (pgdat->node_start_pfn = 0, start_pfn + pgdat->node_spanned_pages = 0). -- Thanks, David / dhildenb