Re: [PATCH v2 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid()
From: Kefeng Wang <hidden>
Date: 2021-04-23 08:11:33
Also in:
kvmarm, linux-mm, lkml
On 2021/4/22 23:28, Kefeng Wang wrote:
On 2021/4/22 15:29, Mike Rapoport wrote:quoted
On Thu, Apr 22, 2021 at 03:00:20PM +0800, Kefeng Wang wrote:quoted
On 2021/4/21 14:51, Mike Rapoport wrote:quoted
From: Mike Rapoport <redacted> Hi, These patches aim to remove CONFIG_HOLES_IN_ZONE and essentially hardwire pfn_valid_within() to 1. The idea is to mark NOMAP pages as reserved in the memory map and restore the intended semantics of pfn_valid() to designate availability of struct page for a pfn. With this the core mm will be able to cope with the fact that it cannot use NOMAP pages and the holes created by NOMAP ranges within MAX_ORDER blocks will be treated correctly even without the need for pfn_valid_within. The patches are only boot tested on qemu-system-aarch64 so I'd really appreciate memory stress tests on real hardware. If this actually works we'll be one step closer to drop custom pfn_valid() on arm64 altogether.
...
Ok, thanks, we met a same panic like the link on arm32(without HOLES_IN_ZONE), the scheme for arm64 could be suit for arm32, right? I will try the patchset with some changes on arm32 and give some feedback.
I tested this patchset(plus arm32 change, like arm64 does) based on lts 5.10，add some debug log, the useful info shows below, if we enable HOLES_IN_ZONE, no panic, any idea, thanks. Zone ranges: Normal [mem 0x0000000080a00000-0x00000000b01fffff] HighMem [mem 0x00000000b0200000-0x00000000ffffefff] Movable zone start for each node Early memory node ranges node 0: [mem 0x0000000080a00000-0x00000000855fffff] node 0: [mem 0x0000000086a00000-0x0000000087dfffff] node 0: [mem 0x000000008bd00000-0x000000008c4fffff] node 0: [mem 0x000000008e300000-0x000000008ecfffff] node 0: [mem 0x0000000090d00000-0x00000000bfffffff] node 0: [mem 0x00000000cc000000-0x00000000dc9fffff] node 0: [mem 0x00000000de700000-0x00000000de9fffff] node 0: [mem 0x00000000e0800000-0x00000000e0bfffff] node 0: [mem 0x00000000f4b00000-0x00000000f6ffffff] node 0: [mem 0x00000000fda00000-0x00000000ffffefff] ----> free_memmap, start_pfn = 85800, 85800000 end_pfn = 86a00, 86a00000 ----> free_memmap, start_pfn = 8c800, 8c800000 end_pfn = 8e300, 8e300000 ----> free_memmap, start_pfn = 8f000, 8f000000 end_pfn = 90000, 90000000 ----> free_memmap, start_pfn = dcc00, dcc00000 end_pfn = de700, de700000 ----> free_memmap, start_pfn = dec00, dec00000 end_pfn = e0000, e0000000 ----> free_memmap, start_pfn = e0c00, e0c00000 end_pfn = e4000, e4000000 ----> free_memmap, start_pfn = f7000, f7000000 end_pfn = f8000, f8000000 === >move_freepages: start_pfn/end_pfn [de600, de7ff], [de600000, de7ff000] : pfn =de600 pfn2phy = de600000 , page = ef3cc000, page-flags = ffffffff 8<--- cut here --- Unable to handle kernel paging request at virtual address fffffffe pgd = 5dd50df5 [fffffffe] *pgd=affff861, *pte=00000000, *ppte=00000000 Internal error: Oops: 37 [#1] SMP ARM Modules linked in: gmac(O) CPU: 2 PID: 635 Comm: test-oom Tainted: G O 5.10.0+ #31 Hardware name: Hisilicon A9 PC is at move_freepages_block+0x150/0x278 LR is at move_freepages_block+0x150/0x278 pc : [<c02383a4>] lr : [<c02383a4>] psr: 200e0393 sp : c4179cf8 ip : 00000000 fp : 00000001 r10: c4179d58 r9 : 000de7ff r8 : 00000000 r7 : c0863280 r6 : 000de600 r5 : 000de600 r4 : ef3cc000 r3 : ffffffff r2 : 00000000 r1 : ef5d069c r0 : fffffffe Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user Control: 1ac5387d Table: 83b0c04a DAC: 55555555 Process test-oom (pid: 635, stack limit = 0x25d667df) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel