[{"id":3678474,"web_url":"http://patchwork.ozlabs.org/comment/3678474/","msgid":"","list_archive_url":null,"date":"2026-04-17T04:23:23","subject":"Re: [PATCH v10] elf: Add test for THP alignment of large load\n segments","submitter":{"id":4387,"url":"http://patchwork.ozlabs.org/api/people/4387/","name":"H.J. Lu","email":"hjl.tools@gmail.com"},"content":"On Fri, Apr 17, 2026 at 11:56 AM WANG Rui wrote:\n>\n> Add a new test to verify that large executable PT_LOAD segments are\n> mapped at addresses aligned to the THP size when the glibc tunable\n> glibc.elf.thp=1 is enabled and the system is configured to use THP\n> in \"always\" mode.\n>\n> The test loads a shared object with a sufficiently large executable\n> segment via dlopen and inspects /proc/self/maps to check that the\n> mapping address is aligned to the THP page size reported by the kernel.\n>\n> The test is skipped if the THP size cannot be determined or if THP is\n> not enabled in \"always\" mode.\n>\n> Signed-off-by: WANG Rui \n\nI'd like to combine your test change with my patch to enable\nTHP segment load with madvise enabled THP:\n\nhttps://patchwork.sourceware.org/project/glibc/list/?series=59892\n\nCan you provide feedback on my patch?\n\nThanks.\n\n> ---\n> Changes since [v9]:\n> * Use FAIL_UNSUPPORTED instead of printf.\n> * Skip tests when THP size exceeds MAX_THP_PAGESIZE.\n> * Add dependency of tst-thp-align on tst-thp-size-mod.\n> * Rebase onto current master.\n>\n> [v9]: https://sourceware.org/pipermail/libc-alpha/2026-April/176598.html\n> ---\n> sysdeps/unix/sysv/linux/Makefile | 5 +\n> sysdeps/unix/sysv/linux/tst-thp-align.c | 155 +++++++++++++++++++++\n> sysdeps/unix/sysv/linux/tst-thp-size-mod.S | 22 +++\n> 3 files changed, 182 insertions(+)\n> create mode 100644 sysdeps/unix/sysv/linux/tst-thp-align.c\n> create mode 100644 sysdeps/unix/sysv/linux/tst-thp-size-mod.S\n>\n> diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile\n> index b06afbdeaab..0d47e9af57e 100644\n> --- a/sysdeps/unix/sysv/linux/Makefile\n> +++ b/sysdeps/unix/sysv/linux/Makefile\n> @@ -698,6 +698,7 @@ $(objpfx)pldd: $(objpfx)xmalloc.o\n> tests += \\\n> tst-rseq-tls-range \\\n> tst-rseq-tls-range-4096 \\\n> + tst-thp-align \\\n> # tests\n> tests-static += \\\n> tst-rseq-tls-range-4096-static \\\n> @@ -705,17 +706,21 @@ tests-static += \\\n> # tests-static\n> modules-names += \\\n> tst-rseq-tls-range-mod \\\n> + tst-thp-size-mod \\\n> # modules-names\n> CFLAGS-tst-rseq-tls-range.c += -DMAIN_TLS_ALIGN=4\n> CFLAGS-tst-rseq-tls-range-4096.c += -DMAIN_TLS_ALIGN=4096\n> CFLAGS-tst-rseq-tls-range-static.c += -DMAIN_TLS_ALIGN=4\n> CFLAGS-tst-rseq-tls-range-4096-static.c += -DMAIN_TLS_ALIGN=4096\n> +LDFLAGS-tst-thp-size-mod.so += -Wl,-z,noseparate-code\n> $(objpfx)tst-rseq-tls-range.out: $(objpfx)tst-rseq-tls-range-mod.so\n> $(objpfx)tst-rseq-tls-range-4096.out: $(objpfx)tst-rseq-tls-range-mod.so\n> $(objpfx)tst-rseq-tls-range-static.out: $(objpfx)tst-rseq-tls-range-mod.so\n> $(objpfx)tst-rseq-tls-range-4096-static.out: $(objpfx)tst-rseq-tls-range-mod.so\n> +$(objpfx)tst-thp-align.out: $(objpfx)tst-thp-size-mod.so\n> tst-rseq-tls-range-static-ENV = LD_LIBRARY_PATH=$(objpfx):$(common-objpfx)\n> tst-rseq-tls-range-4096-static-ENV = LD_LIBRARY_PATH=$(objpfx):$(common-objpfx)\n> +tst-thp-align-ENV = GLIBC_TUNABLES=glibc.elf.thp=1\n>\n> test-internal-extras += tst-nolink-libc\n> ifeq ($(run-built-tests),yes)\n> diff --git a/sysdeps/unix/sysv/linux/tst-thp-align.c b/sysdeps/unix/sysv/linux/tst-thp-align.c\n> new file mode 100644\n> index 00000000000..0b3f18e000f\n> --- /dev/null\n> +++ b/sysdeps/unix/sysv/linux/tst-thp-align.c\n> @@ -0,0 +1,155 @@\n> +/* Test the THP compatible alignment of PT_LOAD segments.\n> +\n> + Copyright (C) 2026 Free Software Foundation, Inc.\n> +\n> + The GNU C Library is free software; you can redistribute it and/or\n> + modify it under the terms of the GNU Lesser General Public\n> + License as published by the Free Software Foundation; either\n> + version 2.1 of the License, or (at your option) any later version.\n> +\n> + The GNU C Library is distributed in the hope that it will be useful,\n> + but WITHOUT ANY WARRANTY; without even the implied warranty of\n> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n> + Lesser General Public License for more details.\n> +\n> + You should have received a copy of the GNU Lesser General Public\n> + License along with the GNU C Library; if not, see\n> + . */\n> +\n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +#include \n> +\n> +#define THP_SIZE_MOD_NAME \"tst-thp-size-mod.so\"\n> +#define MAX_THP_PAGESIZE (32 * 1024 * 1024)\n> +\n> +enum thp_mode_t\n> +{\n> + thp_mode_always,\n> + thp_mode_madvise,\n> + thp_mode_never,\n> + thp_mode_not_supported\n> +};\n> +\n> +static unsigned long int\n> +get_thp_size (void)\n> +{\n> + int fd = open (\"/sys/kernel/mm/transparent_hugepage/hpage_pmd_size\",\n> + O_RDONLY, 0);\n> + if (fd == -1)\n> + return 0;\n> +\n> + char str[INT_BUFSIZE_BOUND (unsigned long int)];\n> + ssize_t s = read (fd, str, sizeof (str));\n> + close (fd);\n> + if (s < 0)\n> + return 0;\n> +\n> + unsigned long int r = 0;\n> + for (ssize_t i = 0; i < s; i++)\n> + {\n> + if (str[i] == '\\n')\n> + break;\n> + r *= 10;\n> + r += str[i] - '0';\n> + }\n> + return r;\n> +}\n> +\n> +static enum thp_mode_t\n> +get_thp_mode (void)\n> +{\n> + int fd = open (\"/sys/kernel/mm/transparent_hugepage/enabled\", O_RDONLY, 0);\n> + if (fd == -1)\n> + return thp_mode_not_supported;\n> +\n> + static const char mode_always[] = \"[always] madvise never\\n\";\n> + static const char mode_madvise[] = \"always [madvise] never\\n\";\n> + static const char mode_never[] = \"always madvise [never]\\n\";\n> +\n> + char str[sizeof(mode_always)];\n> + ssize_t s = read (fd, str, sizeof (str));\n> + if (s >= sizeof str || s < 0)\n> + return thp_mode_not_supported;\n> + str[s] = '\\0';\n> + close (fd);\n> +\n> + if (s == sizeof (mode_always) - 1)\n> + {\n> + if (strcmp (str, mode_always) == 0)\n> + return thp_mode_always;\n> + else if (strcmp (str, mode_madvise) == 0)\n> + return thp_mode_madvise;\n> + else if (strcmp (str, mode_never) == 0)\n> + return thp_mode_never;\n> + }\n> + return thp_mode_not_supported;\n> +}\n> +\n> +static void\n> +check_align (void)\n> +{\n> + unsigned long int thp_size = get_thp_size ();\n> + enum thp_mode_t thp_mode = get_thp_mode ();\n> +\n> + if (thp_size == 0)\n> + {\n> + FAIL_UNSUPPORTED (\"unable to get THP size.\\n\");\n> + return;\n> + }\n> +\n> + if (thp_size > MAX_THP_PAGESIZE)\n> + {\n> + FAIL_UNSUPPORTED (\"THP size exceeds MAX_THP_PAGESIZE.\\n\");\n> + return;\n> + }\n> +\n> + if (thp_mode != thp_mode_always)\n> + {\n> + FAIL_UNSUPPORTED (\"THP mode is not always.\\n\");\n> + return;\n> + }\n> +\n> + FILE *f = xfopen (\"/proc/self/maps\", \"r\");\n> + char *line = NULL;\n> + size_t len;\n> +\n> + while (xgetline (&line, &len, f))\n> + {\n> + uintptr_t from, to;\n> + char *prot = NULL, *path = NULL;\n> + int r = sscanf (line, \"%\" SCNxPTR \"-%\" SCNxPTR \"%ms%*s%*s%*s%ms\",\n> + &from, &to, &prot, &path);\n> +\n> + TEST_VERIFY (r == 3 || r == 4);\n> +\n> + if (strstr (prot, \"x\") && strstr (path, THP_SIZE_MOD_NAME))\n> + TEST_COMPARE (from % thp_size, 0);\n> +\n> + free (path);\n> + }\n> +\n> + free (line);\n> + xfclose (f);\n> +}\n> +\n> +static int\n> +do_test (void)\n> +{\n> + void *dl;\n> +\n> + dl = xdlopen (THP_SIZE_MOD_NAME, RTLD_NOW);\n> + check_align ();\n> + xdlclose (dl);\n> +\n> + return 0;\n> +}\n> +\n> +#include \n> diff --git a/sysdeps/unix/sysv/linux/tst-thp-size-mod.S b/sysdeps/unix/sysv/linux/tst-thp-size-mod.S\n> new file mode 100644\n> index 00000000000..3084c2d0e2c\n> --- /dev/null\n> +++ b/sysdeps/unix/sysv/linux/tst-thp-size-mod.S\n> @@ -0,0 +1,22 @@\n> +/* A module that provides THP code size for testing.\n> +\n> + Copyright (C) 2026 Free Software Foundation, Inc.\n> + This file is part of the GNU C Library.\n> +\n> + The GNU C Library is free software; you can redistribute it and/or\n> + modify it under the terms of the GNU Lesser General Public\n> + License as published by the Free Software Foundation; either\n> + version 2.1 of the License, or (at your option) any later version.\n> +\n> + The GNU C Library is distributed in the hope that it will be useful,\n> + but WITHOUT ANY WARRANTY; without even the implied warranty of\n> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n> + Lesser General Public License for more details.\n> +\n> + You should have received a copy of the GNU Lesser General Public\n> + License along with the GNU C Library; if not, see\n> + . */\n> +\n> + .globl thp_size\n> +thp_size:\n> + .space 32 * 1024 * 1024\n> --\n> 2.53.0\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=QQGH5TSy;\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=QQGH5TSy","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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Thu, 16 Apr 2026\n 21:23:59 -0700 (PDT)","MIME-Version":"1.0","References":"<20260417035556.1778246-1-wangrui@loongson.cn>","In-Reply-To":"<20260417035556.1778246-1-wangrui@loongson.cn>","From":"\"H.J. Lu\" ","Date":"Fri, 17 Apr 2026 12:23:23 +0800","X-Gm-Features":"AQROBzAsFgdnvCu2DHwTCEgnqR90dT-l-h2R543zetkSWSQHoZe72J-cr3qE9fc","Message-ID":"\n ","Subject":"Re: [PATCH v10] elf: Add test for THP alignment of large load\n segments","To":"WANG Rui ","Cc":"libc-alpha@sourceware.org,\n Adhemerval Zanella ,\n Dev Jain ,\n Florian Weimer , Wilco Dijkstra ,\n Xi Ruoyao , WANG Xuerui ,\n caiyinyu ,\n mengqinggang , Huacai Chen ","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"}},{"id":3678536,"web_url":"http://patchwork.ozlabs.org/comment/3678536/","msgid":"","list_archive_url":null,"date":"2026-04-17T07:44:57","subject":"Re: [PATCH v10] elf: Add test for THP alignment of large load\n segments","submitter":{"id":4387,"url":"http://patchwork.ozlabs.org/api/people/4387/","name":"H.J. Lu","email":"hjl.tools@gmail.com"},"content":"On Fri, Apr 17, 2026 at 12:23 PM H.J. Lu wrote:\n>\n> On Fri, Apr 17, 2026 at 11:56 AM WANG Rui wrote:\n> >\n> > Add a new test to verify that large executable PT_LOAD segments are\n> > mapped at addresses aligned to the THP size when the glibc tunable\n> > glibc.elf.thp=1 is enabled and the system is configured to use THP\n> > in \"always\" mode.\n> >\n> > The test loads a shared object with a sufficiently large executable\n> > segment via dlopen and inspects /proc/self/maps to check that the\n> > mapping address is aligned to the THP page size reported by the kernel.\n> >\n> > The test is skipped if the THP size cannot be determined or if THP is\n> > not enabled in \"always\" mode.\n> >\n> > Signed-off-by: WANG Rui \n>\n> I'd like to combine your test change with my patch to enable\n> THP segment load with madvise enabled THP:\n>\n> https://patchwork.sourceware.org/project/glibc/list/?series=59892\n>\n> Can you provide feedback on my patch?\n\nThe updated patch is at\n\nhttps://patchwork.sourceware.org/project/glibc/patch/CAMe9rOryN0j-SZT_C4EYzEHt+B7kQTvC5t4GaQ3H8dPXG+aejg@mail.gmail.com/\n\n> Thanks.\n>\n> > ---\n> > Changes since [v9]:\n> > * Use FAIL_UNSUPPORTED instead of printf.\n> > * Skip tests when THP size exceeds MAX_THP_PAGESIZE.\n> > * Add dependency of tst-thp-align on tst-thp-size-mod.\n> > * Rebase onto current master.\n> >\n> > [v9]: https://sourceware.org/pipermail/libc-alpha/2026-April/176598.html\n> > ---\n> > sysdeps/unix/sysv/linux/Makefile | 5 +\n> > sysdeps/unix/sysv/linux/tst-thp-align.c | 155 +++++++++++++++++++++\n> > sysdeps/unix/sysv/linux/tst-thp-size-mod.S | 22 +++\n> > 3 files changed, 182 insertions(+)\n> > create mode 100644 sysdeps/unix/sysv/linux/tst-thp-align.c\n> > create mode 100644 sysdeps/unix/sysv/linux/tst-thp-size-mod.S\n> >\n> > diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile\n> > index b06afbdeaab..0d47e9af57e 100644\n> > --- a/sysdeps/unix/sysv/linux/Makefile\n> > +++ b/sysdeps/unix/sysv/linux/Makefile\n> > @@ -698,6 +698,7 @@ $(objpfx)pldd: $(objpfx)xmalloc.o\n> > tests += \\\n> > tst-rseq-tls-range \\\n> > tst-rseq-tls-range-4096 \\\n> > + tst-thp-align \\\n> > # tests\n> > tests-static += \\\n> > tst-rseq-tls-range-4096-static \\\n> > @@ -705,17 +706,21 @@ tests-static += \\\n> > # tests-static\n> > modules-names += \\\n> > tst-rseq-tls-range-mod \\\n> > + tst-thp-size-mod \\\n> > # modules-names\n> > CFLAGS-tst-rseq-tls-range.c += -DMAIN_TLS_ALIGN=4\n> > CFLAGS-tst-rseq-tls-range-4096.c += -DMAIN_TLS_ALIGN=4096\n> > CFLAGS-tst-rseq-tls-range-static.c += -DMAIN_TLS_ALIGN=4\n> > CFLAGS-tst-rseq-tls-range-4096-static.c += -DMAIN_TLS_ALIGN=4096\n> > +LDFLAGS-tst-thp-size-mod.so += -Wl,-z,noseparate-code\n> > $(objpfx)tst-rseq-tls-range.out: $(objpfx)tst-rseq-tls-range-mod.so\n> > $(objpfx)tst-rseq-tls-range-4096.out: $(objpfx)tst-rseq-tls-range-mod.so\n> > $(objpfx)tst-rseq-tls-range-static.out: $(objpfx)tst-rseq-tls-range-mod.so\n> > $(objpfx)tst-rseq-tls-range-4096-static.out: $(objpfx)tst-rseq-tls-range-mod.so\n> > +$(objpfx)tst-thp-align.out: $(objpfx)tst-thp-size-mod.so\n> > tst-rseq-tls-range-static-ENV = LD_LIBRARY_PATH=$(objpfx):$(common-objpfx)\n> > tst-rseq-tls-range-4096-static-ENV = LD_LIBRARY_PATH=$(objpfx):$(common-objpfx)\n> > +tst-thp-align-ENV = GLIBC_TUNABLES=glibc.elf.thp=1\n> >\n> > test-internal-extras += tst-nolink-libc\n> > ifeq ($(run-built-tests),yes)\n> > diff --git a/sysdeps/unix/sysv/linux/tst-thp-align.c b/sysdeps/unix/sysv/linux/tst-thp-align.c\n> > new file mode 100644\n> > index 00000000000..0b3f18e000f\n> > --- /dev/null\n> > +++ b/sysdeps/unix/sysv/linux/tst-thp-align.c\n> > @@ -0,0 +1,155 @@\n> > +/* Test the THP compatible alignment of PT_LOAD segments.\n> > +\n> > + Copyright (C) 2026 Free Software Foundation, Inc.\n> > +\n> > + The GNU C Library is free software; you can redistribute it and/or\n> > + modify it under the terms of the GNU Lesser General Public\n> > + License as published by the Free Software Foundation; either\n> > + version 2.1 of the License, or (at your option) any later version.\n> > +\n> > + The GNU C Library is distributed in the hope that it will be useful,\n> > + but WITHOUT ANY WARRANTY; without even the implied warranty of\n> > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n> > + Lesser General Public License for more details.\n> > +\n> > + You should have received a copy of the GNU Lesser General Public\n> > + License along with the GNU C Library; if not, see\n> > + . */\n> > +\n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +#include \n> > +\n> > +#define THP_SIZE_MOD_NAME \"tst-thp-size-mod.so\"\n> > +#define MAX_THP_PAGESIZE (32 * 1024 * 1024)\n> > +\n> > +enum thp_mode_t\n> > +{\n> > + thp_mode_always,\n> > + thp_mode_madvise,\n> > + thp_mode_never,\n> > + thp_mode_not_supported\n> > +};\n> > +\n> > +static unsigned long int\n> > +get_thp_size (void)\n> > +{\n> > + int fd = open (\"/sys/kernel/mm/transparent_hugepage/hpage_pmd_size\",\n> > + O_RDONLY, 0);\n> > + if (fd == -1)\n> > + return 0;\n> > +\n> > + char str[INT_BUFSIZE_BOUND (unsigned long int)];\n> > + ssize_t s = read (fd, str, sizeof (str));\n> > + close (fd);\n> > + if (s < 0)\n> > + return 0;\n> > +\n> > + unsigned long int r = 0;\n> > + for (ssize_t i = 0; i < s; i++)\n> > + {\n> > + if (str[i] == '\\n')\n> > + break;\n> > + r *= 10;\n> > + r += str[i] - '0';\n> > + }\n> > + return r;\n> > +}\n> > +\n> > +static enum thp_mode_t\n> > +get_thp_mode (void)\n> > +{\n> > + int fd = open (\"/sys/kernel/mm/transparent_hugepage/enabled\", O_RDONLY, 0);\n> > + if (fd == -1)\n> > + return thp_mode_not_supported;\n> > +\n> > + static const char mode_always[] = \"[always] madvise never\\n\";\n> > + static const char mode_madvise[] = \"always [madvise] never\\n\";\n> > + static const char mode_never[] = \"always madvise [never]\\n\";\n> > +\n> > + char str[sizeof(mode_always)];\n> > + ssize_t s = read (fd, str, sizeof (str));\n> > + if (s >= sizeof str || s < 0)\n> > + return thp_mode_not_supported;\n> > + str[s] = '\\0';\n> > + close (fd);\n> > +\n> > + if (s == sizeof (mode_always) - 1)\n> > + {\n> > + if (strcmp (str, mode_always) == 0)\n> > + return thp_mode_always;\n> > + else if (strcmp (str, mode_madvise) == 0)\n> > + return thp_mode_madvise;\n> > + else if (strcmp (str, mode_never) == 0)\n> > + return thp_mode_never;\n> > + }\n> > + return thp_mode_not_supported;\n> > +}\n> > +\n> > +static void\n> > +check_align (void)\n> > +{\n> > + unsigned long int thp_size = get_thp_size ();\n> > + enum thp_mode_t thp_mode = get_thp_mode ();\n> > +\n> > + if (thp_size == 0)\n> > + {\n> > + FAIL_UNSUPPORTED (\"unable to get THP size.\\n\");\n> > + return;\n> > + }\n> > +\n> > + if (thp_size > MAX_THP_PAGESIZE)\n> > + {\n> > + FAIL_UNSUPPORTED (\"THP size exceeds MAX_THP_PAGESIZE.\\n\");\n> > + return;\n> > + }\n> > +\n> > + if (thp_mode != thp_mode_always)\n> > + {\n> > + FAIL_UNSUPPORTED (\"THP mode is not always.\\n\");\n> > + return;\n> > + }\n> > +\n> > + FILE *f = xfopen (\"/proc/self/maps\", \"r\");\n> > + char *line = NULL;\n> > + size_t len;\n> > +\n> > + while (xgetline (&line, &len, f))\n> > + {\n> > + uintptr_t from, to;\n> > + char *prot = NULL, *path = NULL;\n> > + int r = sscanf (line, \"%\" SCNxPTR \"-%\" SCNxPTR \"%ms%*s%*s%*s%ms\",\n> > + &from, &to, &prot, &path);\n> > +\n> > + TEST_VERIFY (r == 3 || r == 4);\n> > +\n> > + if (strstr (prot, \"x\") && strstr (path, THP_SIZE_MOD_NAME))\n> > + TEST_COMPARE (from % thp_size, 0);\n> > +\n> > + free (path);\n> > + }\n> > +\n> > + free (line);\n> > + xfclose (f);\n> > +}\n> > +\n> > +static int\n> > +do_test (void)\n> > +{\n> > + void *dl;\n> > +\n> > + dl = xdlopen (THP_SIZE_MOD_NAME, RTLD_NOW);\n> > + check_align ();\n> > + xdlclose (dl);\n> > +\n> > + return 0;\n> > +}\n> > +\n> > +#include \n> > diff --git a/sysdeps/unix/sysv/linux/tst-thp-size-mod.S b/sysdeps/unix/sysv/linux/tst-thp-size-mod.S\n> > new file mode 100644\n> > index 00000000000..3084c2d0e2c\n> > --- /dev/null\n> > +++ b/sysdeps/unix/sysv/linux/tst-thp-size-mod.S\n> > @@ -0,0 +1,22 @@\n> > +/* A module that provides THP code size for testing.\n> > +\n> > + Copyright (C) 2026 Free Software Foundation, Inc.\n> > + This file is part of the GNU C Library.\n> > +\n> > + The GNU C Library is free software; you can redistribute it and/or\n> > + modify it under the terms of the GNU Lesser General Public\n> > + License as published by the Free Software Foundation; either\n> > + version 2.1 of the License, or (at your option) any later version.\n> > +\n> > + The GNU C Library is distributed in the hope that it will be useful,\n> > + but WITHOUT ANY WARRANTY; without even the implied warranty of\n> > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n> > + Lesser General Public License for more details.\n> > +\n> > + You should have received a copy of the GNU Lesser General Public\n> > + License along with the GNU C Library; if not, see\n> > + . */\n> > +\n> > + .globl thp_size\n> > +thp_size:\n> > + .space 32 * 1024 * 1024\n> > --\n> > 2.53.0\n> >\n>\n>\n> --\n> H.J.","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=QNfLpnVm;\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=QNfLpnVm","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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Lu\" ","Date":"Fri, 17 Apr 2026 15:44:57 +0800","X-Gm-Features":"AQROBzA5BEYG8M8hR5-tmaW4JMVeJSYrVrn0CIgGCQGzfYmlTkwkaOeLMJnPo7M","Message-ID":"\n ","Subject":"Re: [PATCH v10] elf: Add test for THP alignment of large load\n segments","To":"WANG Rui ","Cc":"libc-alpha@sourceware.org,\n Adhemerval Zanella ,\n Dev Jain ,\n Florian Weimer , Wilco Dijkstra ,\n Xi Ruoyao , WANG Xuerui ,\n caiyinyu ,\n mengqinggang , Huacai Chen ","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"}},{"id":3679365,"web_url":"http://patchwork.ozlabs.org/comment/3679365/","msgid":"","list_archive_url":null,"date":"2026-04-20T11:23:40","subject":"Re: [PATCH v10] elf: Add test for THP alignment of large load\n segments","submitter":{"id":67598,"url":"http://patchwork.ozlabs.org/api/people/67598/","name":"Wilco Dijkstra","email":"Wilco.Dijkstra@arm.com"},"content":"Hi Rui,\n \n> Add a new test to verify that large executable PT_LOAD segments are\n> mapped at addresses aligned to the THP size when the glibc tunable\n> glibc.elf.thp=1 is enabled and the system is configured to use THP\n> in \"always\" mode.\n>\n> The test loads a shared object with a sufficiently large executable\n> segment via dlopen and inspects /proc/self/maps to check that the\n> mapping address is aligned to the THP page size reported by the kernel.\n>\n> The test is skipped if the THP size cannot be determined or if THP is\n> not enabled in \"always\" mode.\n> \n> Signed-off-by: WANG Rui \n\nLGTM - it now says UNSUPPORTED if THP is not [always]. Committed.\n\nReviewed-by: Wilco Dijkstra  \n\nCheers,\nWilco","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=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=NIPAj2IL;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=NIPAj2IL;\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 (1024-bit key,\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=NIPAj2IL;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=NIPAj2IL","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=arm.com","sourceware.org; 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