[{"id":3677308,"web_url":"http://patchwork.ozlabs.org/comment/3677308/","msgid":"","list_archive_url":null,"date":"2026-04-14T16:34:59","subject":"Re: [PATCH v9 6/6] 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\nSee below for a few minor issues (you can just send an updated version of\nthis patch rather than the whole series - everything else looks good).\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+      printf (\"Skipping test: unable to get THP size.\\n\");\n+      return;\n+    }\n\nSince we want to skip, this should use FAIL_UNSUPPORTED instead of printf.\n\n+\n+  if (thp_mode != thp_mode_always)\n+    {\n+      printf (\"Skipping test: THP mode is not always.\\n\");\n+      return;\n+    }\n\nSame here.\n\nAlso I think we should skip if thp_size > 32 * 1024 * 1024 since we won't do\nthe alignment in that case.\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\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=ZWsd0M2K;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=ZWsd0M2K;\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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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n DB1PEPF000509EC.eurprd03.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","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":3677384,"web_url":"http://patchwork.ozlabs.org/comment/3677384/","msgid":"","list_archive_url":null,"date":"2026-04-14T20:07:23","subject":"Re: [PATCH v9 6/6] 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 Mon, Apr 13, 2026 at 1:44 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> sysdeps/unix/sysv/linux/Makefile | 7 +-\n> sysdeps/unix/sysv/linux/tst-thp-align.c | 149 +++++++++++++++++++++\n> sysdeps/unix/sysv/linux/tst-thp-size-mod.S | 22 +++\n> 3 files changed, 176 insertions(+), 2 deletions(-)\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 9879fec9a93..6e237dd4934 100644\n> --- a/sysdeps/unix/sysv/linux/Makefile\n> +++ b/sysdeps/unix/sysv/linux/Makefile\n> @@ -695,19 +695,22 @@ install-bin += \\\n>\n> $(objpfx)pldd: $(objpfx)xmalloc.o\n>\n> -tests += tst-rseq-tls-range tst-rseq-tls-range-4096\n> +tests += tst-rseq-tls-range tst-rseq-tls-range-4096 tst-thp-align\n> tests-static += tst-rseq-tls-range-static tst-rseq-tls-range-4096-static\n> -modules-names += tst-rseq-tls-range-mod\n> +modules-names += tst-rseq-tls-range-mod tst-thp-size-mod\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: $(objpfx)tst-rseq-tls-range-mod.so\n> tst-rseq-tls-range-static-ENV = LD_LIBRARY_PATH=$(objpfx):$(common-objpfx)\n> tst-rseq-tls-range-4096-static-ENV = LD_LIBRARY_PATH=$(objpfx):$(common-objpfx)\n> +tst-thp-align-ENV = GLIBC_TUNABLES=glibc.elf.thp=1\n> +tst-thp-align-modules = tst-thp-size-mod\n^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nWhat is this for? tst-thp-align.out should depend on tst-thp-size-mod.so.\n\n>\n> test-internal-extras += tst-nolink-libc\n> ifeq ($(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..ec0a8d84a85\n> --- /dev/null\n> +++ b/sysdeps/unix/sysv/linux/tst-thp-align.c\n> @@ -0,0 +1,149 @@\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> +#include \n> +\n> +#define THP_SIZE_MOD_NAME \"tst-thp-size-mod.so\"\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> + printf (\"Skipping test: unable to get THP size.\\n\");\n> + return;\n> + }\n> +\n> + if (thp_mode != thp_mode_always)\n> + {\n> + printf (\"Skipping test: 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=qAFk1Ffd;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; 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=qAFk1Ffd","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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