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Wed, 24 Jun 2020 04:41:22 -0400 X-MC-Unique: 9t1Q-Vz4Pb-j7VSAGd5MDA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 67597107B783; Wed, 24 Jun 2020 08:41:21 +0000 (UTC) Received: from [10.36.113.65] (ovpn-113-65.ams2.redhat.com [10.36.113.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7C86511CC03; Wed, 24 Jun 2020 08:41:19 +0000 (UTC) Subject: Re: [PATCH] mm/spase: never partially remove memmap for early section To: Wei Yang Cc: Michal Hocko , akpm@linux-foundation.org, osalvador@suse.de, dan.j.williams@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20200623094258.6705-1-richard.weiyang@linux.alibaba.com> <20200623151828.GA31426@dhcp22.suse.cz> <57d8a558-dcb3-b318-8e38-6c016b050414@redhat.com> <20200624081324.GA12461@L-31X9LVDL-1304.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200624081324.GA12461@L-31X9LVDL-1304.local> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Rspamd-Queue-Id: C965316A046 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 24.06.20 10:13, Wei Yang wrote: > On Wed, Jun 24, 2020 at 09:48:43AM +0200, David Hildenbrand wrote: >> On 23.06.20 17:18, Michal Hocko wrote: >>> On Tue 23-06-20 17:42:58, Wei Yang wrote: >>>> For early sections, we assumes its memmap will never be partially >>>> removed. But current behavior breaks this. >>>> >>>> Let's correct it. >>>> >>>> Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug") >>>> Signed-off-by: Wei Yang >>> >>> Can a user trigger this or is this a theoretical bug? >> >> I tried to reproduce it, but somehow I get unexpected behavior. >> With a hacked QEMU I can get >=20 > David, >=20 > Thanks for your effort. Would you mind sharing your qemu command line, = so that > I can have a try at my side? The following change to QEMU: diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 51b3050d01..c6a78d83c0 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1010,7 +1010,7 @@ void pc_memory_init(PCMachineState *pcms, } =20 machine->device_memory->base =3D - ROUND_UP(0x100000000ULL + x86ms->above_4g_mem_size, 1 * GiB)= ; + 0x100000000ULL + x86ms->above_4g_mem_size; =20 if (pcmc->enforce_aligned_dimm) { /* size device region assuming 1G page max alignment per slo= t */ Then you can use the following QEMU cmdline: #! /bin/bash sudo x86_64-softmmu/qemu-system-x86_64 \ --enable-kvm \ -m 4160M,maxmem=3D20G,slots=3D1 \ -smp sockets=3D2,cores=3D16 \ -numa node,nodeid=3D0,cpus=3D0-1 -numa node,nodeid=3D1,cpus=3D2-3 \ -machine pc,nvdimm \ -nographic \ -hda /home/dhildenb/git/Fedora-Cloud-Base-31-1.9.x86_64.qcow2 \ -nodefaults \ -net nic -net user \ -chardev stdio,nosignal,id=3Dserial \ -device isa-serial,chardev=3Dserial \ -chardev socket,id=3Dmonitor,path=3D/var/tmp/monitor,server,nowait \ -mon chardev=3Dmonitor,mode=3Dreadline \ -object memory-backend-ram,id=3Dmem0,size=3D8G \ -device nvdimm,id=3Dvm0,memdev=3Dmem0,node=3D0,addr=3D0x144000000,lab= el-size=3D128k >=20 >> >> $ cat /proc/iomem >> [...] >> 100000000-143ffffff : System RAM >> 144000000-343dfffff : Persistent Memory >> 144000000-1441fffff : namespace0.0 >> 144200000-144ffffff : dax0.0 >> >> After >> $ ndctl create-namespace --force --reconfig=3Dnamespace0.0 --mode=3Dde= vdax --size=3D16M >> >> I get >> >> $ cat /proc/iomem >> [...] >> 100000000-143ffffff : System RAM >> 144000000-343dfffff : Persistent Memory >> 144000000-1441fffff : namespace0.0 >> 144200000-144ffffff : dax0.0 >> >=20 > The memory layout seems not changed. Yeah, sorry, int he first example, dax0.0 should be missing (on a fresh QEMU instance instead of after a reboot). >=20 >> I can trigger remove+re-add via=20 >> $ ndctl create-namespace --force --reconfig=3Dnamespace0.0 --mode=3Dde= vdax --size=3D16M >=20 > Do we need to change the mode to force the reconfig? No, that's sufficient. >=20 >> >> So we clearly have an overlap between System RAM and dax0.0 within a s= ection. >> However, I never get early_section() to trigger in >> section_activate()/section_deactivate() ? That's unexpected >> >> >> Definitely something seems to go wrong after the first "ndctl create-n= amespace". >> Using a random page walker: >> >> [root@localhost ~]# ./page-types=20 >=20 > What is this page-types? >=20 >> [ 387.019229] general protection fault, probably for non-canonical ad= dress 0xfdfdfdfdfdfdfdfc: 0000 [#1] SMP NOPTI >> [ 387.020172] CPU: 17 PID: 1314 Comm: page-types Kdump: loaded Tainte= d: G W 5.8.0-rc2 #20 >> [ 387.021015] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), = BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.4 >> [ 387.022056] RIP: 0010:stable_page_flags+0x27/0x3f0 >> [ 387.022519] Code: 00 00 00 66 66 66 66 90 48 85 ff 0f 84 d2 03 00 0= 0 41 54 55 48 89 fd 53 48 8b 57 08 48 8b 1f 48f >> [ 387.024291] RSP: 0018:ffff9f8781057e58 EFLAGS: 00010202 >> [ 387.024775] RAX: fdfdfdfdfdfdfdfc RBX: fdfdfdfdfdfdfdfd RCX: 00007f= fc4f4f1f78 >> [ 387.025423] RDX: 0000000000000001 RSI: 0000002000000000 RDI: ffffc5= 90c5100000 >> [ 387.026052] RBP: ffffc590c5100000 R08: 0000000000000001 R09: 000000= 0000000000 >> [ 387.026696] R10: 0000000000000000 R11: 0000000000000000 R12: 00007f= fc4f4f1f80 >> [ 387.027324] R13: 0000000000040000 R14: 00007ffc4f4d1f80 R15: ffffff= ffa1577ee0 >> [ 387.027974] FS: 00007f91a0f9c580(0000) GS:ffff888b3f7c0000(0000) k= nlGS:0000000000000000 >> [ 387.028699] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> [ 387.029223] CR2: 0000000000449b00 CR3: 000000007a7fc000 CR4: 000000= 00000006e0 >> [ 387.029864] Call Trace: >> [ 387.030108] kpageflags_read+0xcc/0x160 >> [ 387.030473] proc_reg_read+0x53/0x80 >> [ 387.030809] vfs_read+0x9d/0x150 >> [ 387.031114] ksys_pread64+0x65/0xa0 >> [ 387.031449] do_syscall_64+0x4d/0x90 >> [ 387.031783] entry_SYSCALL_64_after_hwframe+0x44/0xa9 It's a tool located in Linux tools/vm/page-types. So with two printk's, I can spot: [ 24.185558] section_deactivate(): depopulate_section_memmap [ 24.202689] pmem0: detected capacity change from 0 to 16777216 [ 24.229747] section_activate(): early_section, not populating memmap [ 24.229777] memmap_init_zone_device initialised 3584 pages in 0ms But nothing actually breaks .... because *drummroll* we use huge pages in= the vmemmap, so the partial depopulate will not actually depopulate anything here. Hug= e page is 2M, the memmap of 128MB sections is exactly 2MB =3D=3D one hugepages. Trying = to depopulate a fraction (e.g., 16MB) of that won't do anything. Now, forcing a CPU without hugepages - PSE (QEMU: "-cpu host,pse=3Doff)",= I can trigger via ndctl create-namespace --force --reconfig=3Dnamespace0.0 --mode=3Dde= vdax --size=3D16M [ 18.044973] pmem0: detected capacity change from 0 to 16777216 [ 18.073813] BUG: unable to handle page fault for address: ffffec73c510= 00b4 [ 18.076236] #PF: supervisor write access in kernel mode [ 18.077211] #PF: error_code(0x0002) - not-present page [ 18.077943] PGD 81ff8067 P4D 81ff8067 PUD 81ff7067 PMD 1437cb067 PTE 0 [ 18.078551] Oops: 0002 [#1] SMP NOPTI [ 18.078915] CPU: 16 PID: 1348 Comm: ndctl Kdump: loaded Tainted: G = W 5.8.0-rc2+ #24 [ 18.079718] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIO= S rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.4 [ 18.080750] RIP: 0010:memmap_init_zone+0x154/0x1c2 [ 18.081213] Code: 77 16 f6 40 10 02 74 10 48 03 48 08 48 89 cb 48 c1 e= b 0c e9 3a ff ff ff 48 89 df 48 c1 e7 06 48f [ 18.082902] RSP: 0018:ffffbdc7011a39b0 EFLAGS: 00010282 [ 18.083395] RAX: ffffec73c5100088 RBX: 0000000000144002 RCX: 000000000= 0144000 [ 18.084057] RDX: 0000000000000004 RSI: 007ffe0000000000 RDI: ffffec73c= 5100080 [ 18.084704] RBP: 027ffe0000000000 R08: 0000000000000001 R09: ffff9f8d3= 8f6d708 [ 18.085369] R10: ffffec73c0000000 R11: 0000000000000000 R12: 000000000= 0000004 [ 18.086020] R13: 0000000000000001 R14: 0000000000144200 R15: 000000000= 0000000 [ 18.086670] FS: 00007efe6b65d780(0000) GS:ffff9f8d3f780000(0000) knlG= S:0000000000000000 [ 18.087417] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.087965] CR2: ffffec73c51000b4 CR3: 000000007d718000 CR4: 000000000= 0340ee0 [ 18.088623] Call Trace: [ 18.088884] move_pfn_range_to_zone+0x128/0x150 [ 18.089313] memremap_pages+0x4e4/0x5a0 [ 18.089681] devm_memremap_pages+0x1e/0x60 [ 18.090081] dev_dax_probe+0x69/0x160 [device_dax] [ 18.090533] really_probe+0x298/0x3c0 [ 18.090896] driver_probe_device+0xe1/0x150 [ 18.091303] ? driver_allows_async_probing+0x50/0x50 [ 18.091780] bus_for_each_drv+0x7e/0xc0 [ 18.092154] __device_attach+0xdf/0x160 [ 18.092527] bus_probe_device+0x8e/0xa0 [ 18.092916] device_add+0x3b9/0x740 [ 18.093258] __devm_create_dev_dax+0x127/0x1c0 [ 18.093686] __dax_pmem_probe+0x1f2/0x219 [dax_pmem_core] [ 18.094200] dax_pmem_probe+0xc/0x1b [dax_pmem] [ 18.094632] nvdimm_bus_probe+0x69/0x1c0 [libnvdimm] [ 18.095109] really_probe+0x147/0x3c0 [ 18.095470] driver_probe_device+0xe1/0x150 [ 18.095883] device_driver_attach+0x53/0x60 [ 18.096289] bind_store+0xd1/0x110 [ 18.096627] kernfs_fop_write+0xce/0x1b0 [ 18.097017] vfs_write+0xb6/0x1a0 [ 18.097350] ksys_write+0x5f/0xe0 [ 18.097681] do_syscall_64+0x4d/0x90 [ 18.098041] entry_SYSCALL_64_after_hwframe+0x44/0xa9 --=20 Thanks, David / dhildenb