[PATCH v3 0/6] mm: Further memory block device cleanups
Qian Cai
cai at lca.pw
Sat Jun 22 05:29:37 AEST 2019
On Fri, 2019-06-21 at 20:24 +0200, David Hildenbrand wrote:
> 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] <IRQ>
> > [ 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] </IRQ>
> > [ 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).
>
It works fine here.
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