[{"id":3676465,"web_url":"http://patchwork.ozlabs.org/comment/3676465/","msgid":"","list_archive_url":null,"date":"2026-04-13T05:35:09","subject":"Re: [PATCH v9 0/6] elf: THP-aware load segment alignment","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\nHi,\n\nPlease take a look at users/hjl/hugepage/master branch:\n\nhttps://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/hugepage/marker\n\nIt includes\n\n30cd1f2158 elf: Support THP segment load with THP enabled with madvise\n6db7f33e4e Check if linker supports -z separate-code\n562148f88e x86-64: Disable THP segment load for tst-valgrind-smoke\n\nPlease test its performance under madvise THP kernel.\n\n\n> Changes since [v8]:\n> * Add a new test case.\n> * Minor formatting fixes.\n> * Mark _dl_map_segment_align with attribute_hidden.\n>\n> Changes since [v7]:\n> * Rename tunable glibc.elf.hugetlb to glibc.elf.thp.\n> * Rebase on current master.\n>\n> Changes since [v6]:\n> * Move MAX_THP_PAGESIZE to hugepages.\n> * Skip THP mode probing when DL_MAP_DEFAULT_THP_PAGESIZE is non-zero.\n>\n> Changes since [v5]:\n> * No functional changes.\n> * Add benchmark results to the commit message.\n>\n> Changes since [v4]:\n> * Merge malloc-hugepages into hugepages.\n> * Limit the glibc.elf.hugetlb tunable maximum value to 1.\n>\n> Changes since [v3]:\n> * Rebased on current master.\n> * Resolved conflicts with recently merged changes.\n> * No functional changes intended.\n>\n> Changes since [v2]:\n> * Refactor THP detection into a new generic hugepages abstraction,\n> moving helpers out of malloc-hugepages.\n> * Add a new tunable, `glibc.elf.hugetlb`, to control THP-aware ELF\n> segment alignment.\n> * Move the Linux implementation of `_dl_map_segment_align` to\n> sysdeps/unix/sysv/linux/, making it generic for Linux (including\n> 32-bit) and avoiding wordsize-64-specific overrides.\n> * Use `static inline` instead of `static __always_inline`.\n>\n> Changes since [v1]:\n> * Fix CI build failure (-Wunused-function).\n>\n> This patch series introduces a small extension point in the ELF loader to allow\n> architecture-specific adjustment of load segment alignment, and uses it to\n> improve Transparent Huge Page (THP) usage on Linux.\n>\n> Patch 1 removes a redundant declaration of `_dl_map_segments` from\n> dl-load.h, avoiding `-Wunused-function` build failures and keeping the\n> prototype colocated with its definition.\n>\n> Patch 2 adds a new helper, `_dl_map_segment_align`, which is called when\n> determining the maximum alignment for ELF load segments. The generic\n> implementation is a no-op and preserves existing behavior.\n>\n> Patch 3 introduces a new tunable, `glibc.elf.hugetlb`, which controls\n> THP-aware alignment of ELF loadable segments. By default, the value is 0\n> and existing behavior is preserved.\n>\n> Patch 4 provides a Linux implementation of `_dl_map_segment_align` that\n> opportunistically aligns large, suitably aligned, non-writable `PT_LOAD`\n> segments to the system’s default THP page size when THP is configured to\n> be used unconditionally and the tunable is enabled.\n>\n> Patch 5 enables this behavior by default on LoongArch64 Linux and defines\n> the default THP page size (32MB), matching the architecture’s PMD huge page\n> geometry.\n>\n> Patch 6 adds a new test for THP alignment of large load segments.\n>\n> [v8]: https://sourceware.org/pipermail/libc-alpha/2026-April/176440.html\n> [v7]: https://sourceware.org/pipermail/libc-alpha/2026-March/175776.html\n> [v6]: https://sourceware.org/pipermail/libc-alpha/2026-March/175737.html\n> [v5]: https://sourceware.org/pipermail/libc-alpha/2026-March/175694.html\n> [v4]: https://sourceware.org/pipermail/libc-alpha/2026-March/175644.html\n> [v3]: https://sourceware.org/pipermail/libc-alpha/2026-February/175464.html\n> [v2]: https://sourceware.org/pipermail/libc-alpha/2026-February/175394.html\n> [v1]: https://sourceware.org/pipermail/libc-alpha/2026-February/175359.html\n>\n> WANG Rui (6):\n> elf: Remove redundant _dl_map_segments declaration from dl-load.h\n> elf: Introduce _dl_map_segment_align hook for segment alignment tuning\n> tunables: Add glibc.elf.thp tunable for THP-aware segment alignment\n> elf: Align large load segments to PMD huge page size for THP\n> loongarch: Enable THP-aligned load segments by default on 64-bit\n> elf: Add test for THP alignment of large load segments\n>\n> elf/dl-load.c | 4 +\n> elf/dl-load.h | 5 +-\n> elf/dl-tunables.list | 8 +\n> manual/tunables.texi | 24 +++\n> sysdeps/generic/dl-map-segment-align.h | 26 +++\n> sysdeps/unix/sysv/linux/Makefile | 8 +-\n> .../unix/sysv/linux/dl-map-segment-align.c | 55 +++++++\n> .../unix/sysv/linux/dl-map-segment-align.h | 27 ++++\n> .../unix/sysv/linux/loongarch/cpu-features.c | 6 +\n> .../loongarch/lp64/dl-map-segment-align.h | 22 +++\n> sysdeps/unix/sysv/linux/tst-thp-align.c | 149 ++++++++++++++++++\n> sysdeps/unix/sysv/linux/tst-thp-size-mod.S | 22 +++\n> 12 files changed, 352 insertions(+), 4 deletions(-)\n> create mode 100644 sysdeps/generic/dl-map-segment-align.h\n> create mode 100644 sysdeps/unix/sysv/linux/dl-map-segment-align.c\n> create mode 100644 sysdeps/unix/sysv/linux/dl-map-segment-align.h\n> create mode 100644 sysdeps/unix/sysv/linux/loongarch/lp64/dl-map-segment-align.h\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> --\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=i7hAvjDH;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; 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Sun, 12 Apr 2026\n 22:35:47 -0700 (PDT)","MIME-Version":"1.0","References":"<20260412174334.3111385-1-wangrui@loongson.cn>","In-Reply-To":"<20260412174334.3111385-1-wangrui@loongson.cn>","From":"\"H.J. Lu\" ","Date":"Mon, 13 Apr 2026 13:35:09 +0800","X-Gm-Features":"AQROBzBH7odfN5Fx5U-a8D8ZQ0rE9l-neVZ5snROSGHiSf5IUjlR1kd37-ru2b8","Message-ID":"\n ","Subject":"Re: [PATCH v9 0/6] elf: THP-aware load segment alignment","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":3677020,"web_url":"http://patchwork.ozlabs.org/comment/3677020/","msgid":"","list_archive_url":null,"date":"2026-04-14T04:23:47","subject":"Re: [PATCH v9 0/6] elf: THP-aware load segment alignment","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 1:35 PM H.J. Lu wrote:\n>\n> On Mon, Apr 13, 2026 at 1:44 AM WANG Rui wrote:\n> >\n>\n> Hi,\n>\n> Please take a look at users/hjl/hugepage/master branch:\n>\n> https://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/hugepage/marker\n>\n> It includes\n>\n> 30cd1f2158 elf: Support THP segment load with THP enabled with madvise\n> 6db7f33e4e Check if linker supports -z separate-code\n> 562148f88e x86-64: Disable THP segment load for tst-valgrind-smoke\n>\n> Please test its performance under madvise THP kernel.\n\nI updated users/hjl/hugepage/master branch to fix a few bugs and\nremove merging 2 PT_LOAD segments.\n\n>\n> > Changes since [v8]:\n> > * Add a new test case.\n> > * Minor formatting fixes.\n> > * Mark _dl_map_segment_align with attribute_hidden.\n> >\n> > Changes since [v7]:\n> > * Rename tunable glibc.elf.hugetlb to glibc.elf.thp.\n> > * Rebase on current master.\n> >\n> > Changes since [v6]:\n> > * Move MAX_THP_PAGESIZE to hugepages.\n> > * Skip THP mode probing when DL_MAP_DEFAULT_THP_PAGESIZE is non-zero.\n> >\n> > Changes since [v5]:\n> > * No functional changes.\n> > * Add benchmark results to the commit message.\n> >\n> > Changes since [v4]:\n> > * Merge malloc-hugepages into hugepages.\n> > * Limit the glibc.elf.hugetlb tunable maximum value to 1.\n> >\n> > Changes since [v3]:\n> > * Rebased on current master.\n> > * Resolved conflicts with recently merged changes.\n> > * No functional changes intended.\n> >\n> > Changes since [v2]:\n> > * Refactor THP detection into a new generic hugepages abstraction,\n> > moving helpers out of malloc-hugepages.\n> > * Add a new tunable, `glibc.elf.hugetlb`, to control THP-aware ELF\n> > segment alignment.\n> > * Move the Linux implementation of `_dl_map_segment_align` to\n> > sysdeps/unix/sysv/linux/, making it generic for Linux (including\n> > 32-bit) and avoiding wordsize-64-specific overrides.\n> > * Use `static inline` instead of `static __always_inline`.\n> >\n> > Changes since [v1]:\n> > * Fix CI build failure (-Wunused-function).\n> >\n> > This patch series introduces a small extension point in the ELF loader to allow\n> > architecture-specific adjustment of load segment alignment, and uses it to\n> > improve Transparent Huge Page (THP) usage on Linux.\n> >\n> > Patch 1 removes a redundant declaration of `_dl_map_segments` from\n> > dl-load.h, avoiding `-Wunused-function` build failures and keeping the\n> > prototype colocated with its definition.\n> >\n> > Patch 2 adds a new helper, `_dl_map_segment_align`, which is called when\n> > determining the maximum alignment for ELF load segments. The generic\n> > implementation is a no-op and preserves existing behavior.\n> >\n> > Patch 3 introduces a new tunable, `glibc.elf.hugetlb`, which controls\n> > THP-aware alignment of ELF loadable segments. By default, the value is 0\n> > and existing behavior is preserved.\n> >\n> > Patch 4 provides a Linux implementation of `_dl_map_segment_align` that\n> > opportunistically aligns large, suitably aligned, non-writable `PT_LOAD`\n> > segments to the system’s default THP page size when THP is configured to\n> > be used unconditionally and the tunable is enabled.\n> >\n> > Patch 5 enables this behavior by default on LoongArch64 Linux and defines\n> > the default THP page size (32MB), matching the architecture’s PMD huge page\n> > geometry.\n> >\n> > Patch 6 adds a new test for THP alignment of large load segments.\n> >\n> > [v8]: https://sourceware.org/pipermail/libc-alpha/2026-April/176440.html\n> > [v7]: https://sourceware.org/pipermail/libc-alpha/2026-March/175776.html\n> > [v6]: https://sourceware.org/pipermail/libc-alpha/2026-March/175737.html\n> > [v5]: https://sourceware.org/pipermail/libc-alpha/2026-March/175694.html\n> > [v4]: https://sourceware.org/pipermail/libc-alpha/2026-March/175644.html\n> > [v3]: https://sourceware.org/pipermail/libc-alpha/2026-February/175464.html\n> > [v2]: https://sourceware.org/pipermail/libc-alpha/2026-February/175394.html\n> > [v1]: https://sourceware.org/pipermail/libc-alpha/2026-February/175359.html\n> >\n> > WANG Rui (6):\n> > elf: Remove redundant _dl_map_segments declaration from dl-load.h\n> > elf: Introduce _dl_map_segment_align hook for segment alignment tuning\n> > tunables: Add glibc.elf.thp tunable for THP-aware segment alignment\n> > elf: Align large load segments to PMD huge page size for THP\n> > loongarch: Enable THP-aligned load segments by default on 64-bit\n> > elf: Add test for THP alignment of large load segments\n> >\n> > elf/dl-load.c | 4 +\n> > elf/dl-load.h | 5 +-\n> > elf/dl-tunables.list | 8 +\n> > manual/tunables.texi | 24 +++\n> > sysdeps/generic/dl-map-segment-align.h | 26 +++\n> > sysdeps/unix/sysv/linux/Makefile | 8 +-\n> > .../unix/sysv/linux/dl-map-segment-align.c | 55 +++++++\n> > .../unix/sysv/linux/dl-map-segment-align.h | 27 ++++\n> > .../unix/sysv/linux/loongarch/cpu-features.c | 6 +\n> > .../loongarch/lp64/dl-map-segment-align.h | 22 +++\n> > sysdeps/unix/sysv/linux/tst-thp-align.c | 149 ++++++++++++++++++\n> > sysdeps/unix/sysv/linux/tst-thp-size-mod.S | 22 +++\n> > 12 files changed, 352 insertions(+), 4 deletions(-)\n> > create mode 100644 sysdeps/generic/dl-map-segment-align.h\n> > create mode 100644 sysdeps/unix/sysv/linux/dl-map-segment-align.c\n> > create mode 100644 sysdeps/unix/sysv/linux/dl-map-segment-align.h\n> > create mode 100644 sysdeps/unix/sysv/linux/loongarch/lp64/dl-map-segment-align.h\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> > --\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=Wajvdzzf;\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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Mon, 13 Apr 2026\n 21:24:24 -0700 (PDT)","MIME-Version":"1.0","References":"<20260412174334.3111385-1-wangrui@loongson.cn>\n ","In-Reply-To":"\n ","From":"\"H.J. Lu\" ","Date":"Tue, 14 Apr 2026 12:23:47 +0800","X-Gm-Features":"AQROBzB_4TFOKobujNLHy-N6y2yC_jqQt-xlEt99elkMWX5eBbRRM7xouvoAcW0","Message-ID":"\n ","Subject":"Re: [PATCH v9 0/6] elf: THP-aware load segment alignment","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"}}]