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Mon, 28 Apr 2025 13:52:55 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 454AB2004B; Mon, 28 Apr 2025 13:52:55 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5CACD20040; Mon, 28 Apr 2025 13:52:54 +0000 (GMT) Received: from osiris (unknown [9.111.53.81]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Mon, 28 Apr 2025 13:52:54 +0000 (GMT) Date: Mon, 28 Apr 2025 15:52:52 +0200 From: Heiko Carstens To: Kairui Song Cc: linux-mm@kvack.org, Andrew Morton , Chris Li , Barry Song , Hugh Dickins , Yosry Ahmed , "Huang, Ying" , Baoquan He , Nhat Pham , Johannes Weiner , Baolin Wang , Kalesh Singh , Matthew Wilcox , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: Re: [PATCH v3 6/7] mm, swap: remove swap slot cache Message-ID: <20250428135252.25453B17-hca@linux.ibm.com> References: <20250313165935.63303-1-ryncsn@gmail.com> <20250313165935.63303-7-ryncsn@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; 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> - unsigned long size = 1 << order; > + unsigned int order = folio_order(folio); > + unsigned int size = 1 << order; > struct swap_info_struct *si, *next; > - int n_ret = 0; > + swp_entry_t entry = {}; > + unsigned long offset; > int node; > > + if (order) { > + /* > + * Should not even be attempting large allocations when huge > + * page swap is disabled. Warn and fail the allocation. > + */ > + if (!IS_ENABLED(CONFIG_THP_SWAP) || size > SWAPFILE_CLUSTER) { > + VM_WARN_ON_ONCE(1); > + return entry; > + } > + } This warning triggers on s390. CONFIG_THP_SWAP is disabled and order is 8 when this triggers (reproduced with ltp's swapon01 test case): ------------[ cut here ]------------ WARNING: CPU: 1 PID: 895 at mm/swapfile.c:1227 folio_alloc_swap+0x438/0x440 Modules linked in: CPU: 1 UID: 0 PID: 895 Comm: swapon01 Not tainted 6.14.0-rc6-00227-g0ff67f990bd4-dirty #25 Hardware name: IBM 3931 A01 704 (z/VM 7.4.0) Krnl PSW : 0704d00180000000 000003ffe051210c (folio_alloc_swap+0x43c/0x440) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 RI:0 EA:3 Krnl GPRS: 0000000080000000 0000000000000001 0000000000000013 0000000000070000 0000000000000006 fffffef40e9da000 0000000000000000 0000037202fc4000 0000037f00000100 0000000000000100 0000037fe2e4b770 0000037202fc4000 0000000000000000 0000000000000000 000003ffe0512108 0000037fe2e4b3c8 Krnl Code: 000003ffe05120fe: b9160044 llgfr %r4,%r4 000003ffe0512102: c0e5ffdf8c0b brasl %r14,000003ffe0103918 #000003ffe0512108: af000000 mc 0,0 >000003ffe051210c: a7f4fe94 brc 15,000003ffe0511e34 000003ffe0512110: c0040069ce74 brcl 0,000003ffe124bdf8 000003ffe0512116: eb8ff0580024 stmg %r8,%r15,88(%r15) 000003ffe051211c: b90400ef lgr %r14,%r15 000003ffe0512120: e3f0ffb8ff71 lay %r15,-72(%r15) Call Trace: [<000003ffe051210c>] folio_alloc_swap+0x43c/0x440 [<000003ffe050afa6>] add_to_swap+0x56/0xf0 [<000003ffe045fdc0>] shrink_folio_list+0xe80/0x13b0 [<000003ffe0461946>] shrink_inactive_list+0x1a6/0x550 [<000003ffe04624a2>] shrink_lruvec+0x2b2/0x410 [<000003ffe0462840>] shrink_node_memcgs+0x240/0x2d0 [<000003ffe0462986>] shrink_node+0xb6/0x3e0 [<000003ffe046302a>] do_try_to_free_pages+0xda/0x610 [<000003ffe0464d2c>] try_to_free_mem_cgroup_pages+0x14c/0x2a0 [<000003ffe0568270>] try_charge_memcg+0x220/0x5d0 [<000003ffe056867a>] charge_memcg+0x5a/0x270 [<000003ffe056a484>] __mem_cgroup_charge+0x44/0x80 [<000003ffe04acf20>] alloc_anon_folio+0x280/0x610 [<000003ffe04ad45a>] do_anonymous_page+0x1aa/0x5e0 [<000003ffe04af4c4>] __handle_mm_fault+0x244/0x500 [<000003ffe04af820>] handle_mm_fault+0xa0/0x170 [<000003ffe01533f8>] do_exception+0x1d8/0x4a0 [<000003ffe11fb92a>] __do_pgm_check+0x13a/0x220 [<000003ffe120c3ce>] pgm_check_handler+0x11e/0x170 ---[ end trace 0000000000000000 ]---