{"id":2219872,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2219872/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/patch/20260405035323.558335-4-wangrui@loongson.cn/","project":{"id":41,"url":"http://patchwork.ozlabs.org/api/1.2/projects/41/?format=json","name":"GNU C Library","link_name":"glibc","list_id":"libc-alpha.sourceware.org","list_email":"libc-alpha@sourceware.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260405035323.558335-4-wangrui@loongson.cn>","list_archive_url":null,"date":"2026-04-05T03:53:19","name":"[v8,3/6] elf: Introduce _dl_map_segment_align hook for segment alignment tuning","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"87a10db106a442b395e249703e2fe0eefc659bec","submitter":{"id":85150,"url":"http://patchwork.ozlabs.org/api/1.2/people/85150/?format=json","name":"WANG Rui","email":"wangrui@loongson.cn"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/glibc/patch/20260405035323.558335-4-wangrui@loongson.cn/mbox/","series":[{"id":498763,"url":"http://patchwork.ozlabs.org/api/1.2/series/498763/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/list/?series=498763","date":"2026-04-05T03:53:16","name":"elf: THP-aware load segment alignment","version":8,"mbox":"http://patchwork.ozlabs.org/series/498763/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2219872/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2219872/checks/","tags":{},"related":[],"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 spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; 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server2.sourceware.org","From":"WANG Rui ","To":"libc-alpha@sourceware.org","Cc":"Adhemerval Zanella ,\n Dev Jain , Florian Weimer ,\n Wilco Dijkstra , Xi Ruoyao ,\n WANG Xuerui , caiyinyu ,\n mengqinggang ,\n Huacai Chen , hjl.tools@gmail.com,\n WANG Rui ","Subject":"[PATCH v8 3/6] elf: Introduce _dl_map_segment_align hook for segment\n alignment tuning","Date":"Sun, 5 Apr 2026 11:53:19 +0800","Message-ID":"<20260405035323.558335-4-wangrui@loongson.cn>","X-Mailer":"git-send-email 2.53.0","In-Reply-To":"<20260405035323.558335-1-wangrui@loongson.cn>","References":"<20260405035323.558335-1-wangrui@loongson.cn>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"qMiowJBxDOHK3NFpP1JlAA--.44692S5","X-CM-SenderInfo":"pzdqw2txl6z05rqj20fqof0/","X-Coremail-Antispam":"1Uk129KBj93XoWxCFyktFW8tF4Dtr1ftw1xtFc_yoW5Ww45pF\n 97CF4rKF1rJF17CFZ3t3W2kr15X3WrGF4YyrnxuwnrZrs7GFy8XrZIv3WYgryrGrW8CF4S\n vFZFqF98Ca1rArcCm3ZEXasCq-sJn29KB7ZKAUJUUUU7529EdanIXcx71UUUUU7KY7ZEXa\n sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU\n 0xBIdaVrnRJUUUBYb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2\n IYs7xG6rWj6s0DM7CIcVAFz4kK6r1a6r1DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v\n e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI\n 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_\n Gr0_Gr1UM2kKe7AKxVWUXVWUAwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYI\n kI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUtVWr\n XwAv7VC2z280aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI4\n 8JMxkF7I0En4kS14v26r126r1DMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j\n 6r4UMxCIbckI1I0E14v26r1Y6r17MI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwV\n AFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv2\n 0xvE14v26ryj6F1UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4\n v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AK\n xVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7IU1mii3UUUUU==","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"},"content":"Introduce a new helper function, _dl_map_segment_align, to allow\narchitecture-specific adjustment of ELF load segment alignment during\nobject mapping.\n\nThe generic ELF loader now calls this hook when determining the maximum\nsegment alignment. The generic implementation is a no-op and preserves\nexisting behavior.\n\nThis provides a well-defined extension point for architectures that\nneed to adjust segment alignment policies (for example, to improve\nmapping efficiency or enable platform-specific optimizations) without\nembedding such logic directly in the generic loader.\n\nReviewed-by: Wilco Dijkstra \nSigned-off-by: WANG Rui \n---\n elf/dl-load.c | 4 ++++\n sysdeps/generic/dl-map-segment-align.h | 26 ++++++++++++++++++++++++++\n 2 files changed, 30 insertions(+)\n create mode 100644 sysdeps/generic/dl-map-segment-align.h","diff":"diff --git a/elf/dl-load.c b/elf/dl-load.c\nindex 7355eef8e76..f3d943e99c0 100644\n--- a/elf/dl-load.c\n+++ b/elf/dl-load.c\n@@ -71,6 +71,7 @@ struct filebuf\n #include \n #include \n #include \n+#include \n #include \n #include \n #include \n@@ -1171,6 +1172,9 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,\n \n \t /* Optimize a common case. */\n \t c->prot = pf_to_prot (ph->p_flags);\n+\n+\t /* Architecture-specific adjustment of segment alignment. */\n+\t p_align_max = _dl_map_segment_align (c, p_align_max);\n \t break;\n \n \tcase PT_TLS:\ndiff --git a/sysdeps/generic/dl-map-segment-align.h b/sysdeps/generic/dl-map-segment-align.h\nnew file mode 100644\nindex 00000000000..f4a671f25f8\n--- /dev/null\n+++ b/sysdeps/generic/dl-map-segment-align.h\n@@ -0,0 +1,26 @@\n+/* _dl_map_segment_align. Generic version.\n+ Copyright (C) 2026 Free Software Foundation, Inc.\n+ Copyright The GNU Toolchain Authors.\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+#include \n+\n+static inline ElfW(Addr)\n+_dl_map_segment_align (const struct loadcmd *c, ElfW(Addr) p_align_max)\n+{\n+ return p_align_max;\n+}\n","prefixes":["v8","3/6"]}