[{"id":3679403,"web_url":"http://patchwork.ozlabs.org/comment/3679403/","msgid":"<8dcc2eba-5118-48ad-a0b7-cc5ea122e187@redhat.com>","list_archive_url":null,"date":"2026-04-20T13:15:25","subject":"Re: [PATCH v4] elf: Support THP segment load with madvise enabled THP","submitter":{"id":22438,"url":"http://patchwork.ozlabs.org/api/people/22438/","name":"Carlos O'Donell","email":"carlos@redhat.com"},"content":"On 4/18/26 11:15 PM, H.J. Lu wrote:\n> Changes from v3:\n> \n> 1. Fold the -z separate-code linker option check.\n> 2. Move DL_MAP_DEFAULT_THP_PAGESIZE to \n> and default it to 0.\n> 3. Don't run strace tests for cross-compiling.\n> 4. Remove return after FAIL_UNSUPPORTED in THP test.\n> \n> Changes from v2:\n> \n> 1. Keep _dl_map_segment_align name.\n> 2. Pass size_t to _dl_map_segment_align.\n> 3. Enable THP if THP is always enabled in the kernel.\n> 4. Disable THP if THP page size > MAX_THP_PAGESIZE\n> \n> Changes from v1:\n> \n> 1. Rebased against the v10 THP test patch from WANG Rui .\n> 2. Keep DL_MAP_DEFAULT_THP_PAGESIZE.\n> \n\nThis has a 32-bit Arm regression:\nhttps://patchwork.sourceware.org/project/glibc/patch/CAMe9rOqKfFXMDY07GRuppudP3V9fsCDXoyxDesPMNQLDrRhzvg@mail.gmail.com/\n\nProduces 4 regressions:\n |\n | regressions.sum:\n | Running glibc:elf ...\n | FAIL: elf/tst-thp-1-no-s-code-pde\n | FAIL: elf/tst-thp-1-no-s-code-static\n | FAIL: elf/tst-thp-1-pde\n | FAIL: elf/tst-thp-1-static\n\nI know you're already in discussions with Linaro about this issue.\n\nPlease be aware that the Linaro report should have all the information you need.","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=VXi1P2wm;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; 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Lu\" , GNU C Library\n , WANG Rui ","References":"\n ","From":"Carlos O'Donell ","Organization":"Red Hat, LLC.","In-Reply-To":"\n ","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"uS00YRQDkoTNAax2YK1ciw22AJQi7MXonTGQljuFm_Q_1776690930","X-Mimecast-Originator":"redhat.com","Content-Language":"en-US","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-BeenThere":"libc-alpha@sourceware.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Libc-alpha mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org"}},{"id":3679612,"web_url":"http://patchwork.ozlabs.org/comment/3679612/","msgid":"","list_archive_url":null,"date":"2026-04-20T21:45:58","subject":"Re: [PATCH v4] elf: Support THP segment load with madvise enabled THP","submitter":{"id":4387,"url":"http://patchwork.ozlabs.org/api/people/4387/","name":"H.J. Lu","email":"hjl.tools@gmail.com"},"content":"On Mon, Apr 20, 2026 at 9:15 PM Carlos O'Donell wrote:\n>\n> On 4/18/26 11:15 PM, H.J. Lu wrote:\n> > Changes from v3:\n> >\n> > 1. Fold the -z separate-code linker option check.\n> > 2. Move DL_MAP_DEFAULT_THP_PAGESIZE to \n> > and default it to 0.\n> > 3. Don't run strace tests for cross-compiling.\n> > 4. Remove return after FAIL_UNSUPPORTED in THP test.\n> >\n> > Changes from v2:\n> >\n> > 1. Keep _dl_map_segment_align name.\n> > 2. Pass size_t to _dl_map_segment_align.\n> > 3. Enable THP if THP is always enabled in the kernel.\n> > 4. Disable THP if THP page size > MAX_THP_PAGESIZE\n> >\n> > Changes from v1:\n> >\n> > 1. Rebased against the v10 THP test patch from WANG Rui .\n> > 2. Keep DL_MAP_DEFAULT_THP_PAGESIZE.\n> >\n>\n> This has a 32-bit Arm regression:\n> https://patchwork.sourceware.org/project/glibc/patch/CAMe9rOqKfFXMDY07GRuppudP3V9fsCDXoyxDesPMNQLDrRhzvg@mail.gmail.com/\n>\n> Produces 4 regressions:\n> |\n> | regressions.sum:\n> | Running glibc:elf ...\n> | FAIL: elf/tst-thp-1-no-s-code-pde\n> | FAIL: elf/tst-thp-1-no-s-code-static\n> | FAIL: elf/tst-thp-1-pde\n> | FAIL: elf/tst-thp-1-static\n>\n> I know you're already in discussions with Linaro about this issue.\n>\n> Please be aware that the Linaro report should have all the information you need.\n>\n\nIt looks like PIE works and PDE doesn't work on arm.\nMy arm cross glibc test binaries look like\n\n[hjl@gnu-zen4-1 glibc]$ readelf -lW elf/tst-thp-1-pde\n\nElf file type is EXEC (Executable file)\nEntry point 0x2003dc\nThere are 11 program headers, starting at offset 52\n\nProgram Headers:\n Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align\n ARM_EXIDX 0x2400e24 0x02400e24 0x02400e24 0x000c8 0x000c8 R 0x4\n PHDR 0x000034 0x00000034 0x00000034 0x00160 0x00160 R 0x4\n INTERP 0x010194 0x00010194 0x00010194 0x00019 0x00019 R 0x1\n [Requesting program interpreter: /lib/ld-linux-armhf.so.3]\n LOAD 0x000000 0x00000000 0x00000000 0x11374 0x11374 R 0x200000\n LOAD 0x200000 0x00200000 0x00200000 0x20032d0 0x20032d0 R E 0x200000\n LOAD 0x2400000 0x02400000 0x02400000 0x00f10 0x00f10 R 0x200000\n LOAD 0x25ffebc 0x027ffebc 0x027ffebc 0x002a4 0x002c4 RW 0x200000\n DYNAMIC 0x25fff08 0x027fff08 0x027fff08 0x000f8 0x000f8 RW 0x4\n NOTE 0x2400ef0 0x02400ef0 0x02400ef0 0x00020 0x00020 R 0x4\n GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x10\n GNU_RELRO 0x25ffebc 0x027ffebc 0x027ffebc 0x00144 0x00144 R 0x1\n\n Section to Segment mapping:\n Segment Sections...\n 00 .ARM.exidx\n 01\n 02 .interp\n 03 .interp .hash .gnu.hash .dynsym .dynstr .gnu.version\n.gnu.version_r .rel.dyn .rel.plt\n 04 .init .plt .text .fini\n 05 .rodata .ARM.extab .ARM.exidx .eh_frame .note.ABI-tag\n 06 .init_array .fini_array .data.rel.ro .dynamic .got .data .bss\n 07 .dynamic\n 08 .note.ABI-tag\n 09\n 10 .init_array .fini_array .data.rel.ro .dynamic\n[hjl@gnu-zen4-1 glibc]$\n\nNo idea why these tests failed on arm.\n\nThese are what I asked Linaro. I couldn't find them in the Linaro report.\nI haven't heard back from them.\n\n---\n>\n> Produces 4 regressions:\n> |\n> | regressions.sum:\n> | Running glibc:elf ...\n> | FAIL: elf/tst-thp-1-no-s-code-pde\n> | FAIL: elf/tst-thp-1-no-s-code-static\n> | FAIL: elf/tst-thp-1-pde\n> | FAIL: elf/tst-thp-1-static\n\nWhat do they report, like in elf/tst-thp-1-pde.out? What is in\n/sys/kernel/mm/transparent_hugepage/hpage_pmd_size?\n---","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=LkicP9nz;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; helo=vm01.sourceware.org;\n envelope-from=libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (2048-bit key,\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=LkicP9nz","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; spf=pass smtp.mailfrom=gmail.com","server2.sourceware.org;\n arc=pass smtp.remote-ip=2607:f8b0:4864:20::52c"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fzzbb3FFXz1yD8\n\tfor ; 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Mon, 20 Apr 2026\n 14:46:35 -0700 (PDT)","MIME-Version":"1.0","References":"\n \n <8dcc2eba-5118-48ad-a0b7-cc5ea122e187@redhat.com>","In-Reply-To":"<8dcc2eba-5118-48ad-a0b7-cc5ea122e187@redhat.com>","From":"\"H.J. Lu\" ","Date":"Tue, 21 Apr 2026 05:45:58 +0800","X-Gm-Features":"AQROBzDo7paOIGRaI1WQRd1Vrsh7hqGxfk9G6HjV7m_SdGTHPwff8SyuR7XTo5Q","Message-ID":"\n ","Subject":"Re: [PATCH v4] elf: Support THP segment load with madvise enabled THP","To":"\"Carlos O'Donell\" ","Cc":"GNU C Library , WANG Rui ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-BeenThere":"libc-alpha@sourceware.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Libc-alpha mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org"}}]