[{"id":3685235,"web_url":"http://patchwork.ozlabs.org/comment/3685235/","msgid":"","list_archive_url":null,"date":"2026-05-01T22:27:02","subject":"Re: [PATCH] hugepages: cache THP mode and page size [BZ #34083]","submitter":{"id":4387,"url":"http://patchwork.ozlabs.org/api/people/4387/","name":"H.J. Lu","email":"hjl.tools@gmail.com"},"content":"On Sat, May 2, 2026 at 4:59 AM Shamil Abdulaev wrote:\n>\n> __get_thp_mode and __get_thp_size read /sys files and are used by\n> both the dynamic linker and malloc. Cache their results in rtld_global\n> so the expensive THP probes are performed once per process.\n>\n> Tested on x86_64-linux-gnu. No new test failures.\n\nI took a different approach:\n\nhttps://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/hugepage/pr34083\n\nsince 2 THP optimizations can be controlled independently. They share\nthe same THP mode only if both are enabled.\n\n> Signed-off-by: Shamil Abdulaev \n> ---\n> elf/dl-support.c | 6 +++\n> sysdeps/generic/hugepages.h | 7 ++++\n> sysdeps/generic/ldsodefs.h | 6 +++\n> sysdeps/unix/sysv/linux/hugepages.c | 58 ++++++++++++++++++++++++-----\n> 4 files changed, 68 insertions(+), 9 deletions(-)\n>\n> diff --git a/elf/dl-support.c b/elf/dl-support.c\n> index 0508d6113b..ec77cb3e7a 100644\n> --- a/elf/dl-support.c\n> +++ b/elf/dl-support.c\n> @@ -144,6 +144,12 @@ int _dl_inhibit_cache;\n> /* All known directories in sorted order. */\n> struct r_search_path_elem *_dl_all_dirs;\n>\n> +/* Cached Transparent Huge Page mode and page size. */\n> +int _dl_thp_mode;\n> +unsigned long int _dl_thp_pagesize;\n> +int _dl_thp_mode_state;\n> +int _dl_thp_pagesize_state;\n> +\n> /* All directories after startup. */\n> struct r_search_path_elem *_dl_init_all_dirs;\n>\n> diff --git a/sysdeps/generic/hugepages.h b/sysdeps/generic/hugepages.h\n> index 5fc9b5c8de..68be2ee242 100644\n> --- a/sysdeps/generic/hugepages.h\n> +++ b/sysdeps/generic/hugepages.h\n> @@ -32,6 +32,13 @@ enum thp_mode_t\n> thp_mode_not_supported\n> };\n>\n> +enum thp_cache_state_t\n> +{\n> + thp_cache_uninitialized,\n> + thp_cache_initializing,\n> + thp_cache_initialized\n> +};\n> +\n> enum thp_mode_t __get_thp_mode (void) attribute_hidden;\n>\n> /* Return the supported huge page size from the REQUESTED sizes on PAGESIZE\n> diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h\n> index 15c4659853..4b2e337a81 100644\n> --- a/sysdeps/generic/ldsodefs.h\n> +++ b/sysdeps/generic/ldsodefs.h\n> @@ -395,6 +395,12 @@ struct rtld_global\n> /* List of search directories. */\n> EXTERN struct r_search_path_elem *_dl_all_dirs;\n>\n> + /* Cached Transparent Huge Page mode and page size. */\n> + EXTERN int _dl_thp_mode;\n> + EXTERN unsigned long int _dl_thp_pagesize;\n> + EXTERN int _dl_thp_mode_state;\n> + EXTERN int _dl_thp_pagesize_state;\n> +\n> /* Get architecture specific definitions. */\n> #define PROCINFO_DECL\n> #ifndef PROCINFO_CLASS\n> diff --git a/sysdeps/unix/sysv/linux/hugepages.c b/sysdeps/unix/sysv/linux/hugepages.c\n> index 46e05151a3..c32127f6a4 100644\n> --- a/sysdeps/unix/sysv/linux/hugepages.c\n> +++ b/sysdeps/unix/sysv/linux/hugepages.c\n> @@ -16,6 +16,8 @@\n> License along with the GNU C Library; see the file COPYING.LIB. If\n> not, see . */\n>\n> +#include \n> +#include \n> #include \n> #include \n> #include \n> @@ -25,18 +27,32 @@\n> unsigned long int\n> __get_thp_size (void)\n> {\n> + if (atomic_load_acquire (&GL (dl_thp_pagesize_state))\n> + == thp_cache_initialized)\n> + return GL (dl_thp_pagesize);\n> +\n> + int state = thp_cache_uninitialized;\n> + if (!atomic_compare_exchange_acquire (&GL (dl_thp_pagesize_state),\n> + &state, thp_cache_initializing))\n> + {\n> + while (atomic_load_acquire (&GL (dl_thp_pagesize_state))\n> + != thp_cache_initialized)\n> + atomic_spin_nop ();\n> + return GL (dl_thp_pagesize);\n> + }\n> +\n> + unsigned long int r = 0;\n> int fd = __open64_nocancel (\n> \"/sys/kernel/mm/transparent_hugepage/hpage_pmd_size\", O_RDONLY);\n> if (fd == -1)\n> - return 0;\n> + goto out;\n>\n> char str[INT_BUFSIZE_BOUND (unsigned long int)];\n> ssize_t s = __read_nocancel (fd, str, sizeof (str));\n> __close_nocancel (fd);\n> if (s < 0)\n> - return 0;\n> + goto out;\n>\n> - unsigned long int r = 0;\n> for (ssize_t i = 0; i < s; i++)\n> {\n> if (str[i] == '\\n')\n> @@ -44,16 +60,36 @@ __get_thp_size (void)\n> r *= 10;\n> r += str[i] - '0';\n> }\n> +\n> +out:\n> + GL (dl_thp_pagesize) = r;\n> + atomic_store_release (&GL (dl_thp_pagesize_state),\n> + thp_cache_initialized);\n> return r;\n> }\n>\n> enum thp_mode_t\n> __get_thp_mode (void)\n> {\n> + if (atomic_load_acquire (&GL (dl_thp_mode_state))\n> + == thp_cache_initialized)\n> + return (enum thp_mode_t) GL (dl_thp_mode);\n> +\n> + int state = thp_cache_uninitialized;\n> + if (!atomic_compare_exchange_acquire (&GL (dl_thp_mode_state),\n> + &state, thp_cache_initializing))\n> + {\n> + while (atomic_load_acquire (&GL (dl_thp_mode_state))\n> + != thp_cache_initialized)\n> + atomic_spin_nop ();\n> + return (enum thp_mode_t) GL (dl_thp_mode);\n> + }\n> +\n> + enum thp_mode_t mode = thp_mode_not_supported;\n> int fd = __open64_nocancel (\"/sys/kernel/mm/transparent_hugepage/enabled\",\n> O_RDONLY);\n> if (fd == -1)\n> - return thp_mode_not_supported;\n> + goto out;\n>\n> static const char mode_always[] = \"[always] madvise never\\n\";\n> static const char mode_madvise[] = \"always [madvise] never\\n\";\n> @@ -63,19 +99,23 @@ __get_thp_mode (void)\n> ssize_t s = __read_nocancel (fd, str, sizeof (str));\n> __close_nocancel (fd);\n> if (s >= sizeof str || s < 0)\n> - return thp_mode_not_supported;\n> + goto out;\n> str[s] = '\\0';\n>\n> if (s == sizeof (mode_always) - 1)\n> {\n> if (strcmp (str, mode_always) == 0)\n> - return thp_mode_always;\n> + mode = thp_mode_always;\n> else if (strcmp (str, mode_madvise) == 0)\n> - return thp_mode_madvise;\n> + mode = thp_mode_madvise;\n> else if (strcmp (str, mode_never) == 0)\n> - return thp_mode_never;\n> + mode = thp_mode_never;\n> }\n> - return thp_mode_not_supported;\n> +\n> +out:\n> + GL (dl_thp_mode) = mode;\n> + atomic_store_release (&GL (dl_thp_mode_state), thp_cache_initialized);\n> + return mode;\n> }\n>\n> #if !IS_IN (rtld)\n> --\n> 2.54.0\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=MHDyk3PA;\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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Fri, 01 May 2026\n 15:27:39 -0700 (PDT)","MIME-Version":"1.0","References":"\n ","In-Reply-To":"\n ","From":"\"H.J. Lu\" ","Date":"Sat, 2 May 2026 06:27:02 +0800","X-Gm-Features":"AVHnY4Jy_-sz_JNHnERWDT_E7v2JgRQpgRSap5XyA7MHzjPHq_y6ZkdlSgSp-Q0","Message-ID":"\n ","Subject":"Re: [PATCH] hugepages: cache THP mode and page size [BZ #34083]","To":"Shamil Abdulaev ","Cc":"libc-alpha@sourceware.org","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":3685258,"web_url":"http://patchwork.ozlabs.org/comment/3685258/","msgid":"<20260502083508.2988767-1-ashamil435@gmail.com>","list_archive_url":null,"date":"2026-05-02T08:35:08","subject":"Re: [PATCH] hugepages: cache THP mode and page size [BZ #34083]","submitter":{"id":93241,"url":"http://patchwork.ozlabs.org/api/people/93241/","name":"Shamil Abdulaev","email":"ashamil435@gmail.com"},"content":"On Sat, May 2, 2026 at 6:27 AM H.J. Lu wrote:\n> I took a different approach:\n> https://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/hugepage/pr34083\n>\n> since 2 THP optimizations can be controlled independently. They share\n> the same THP mode only if both are enabled.\n\nThanks for the pointer.\n\nYour \"Support THP segment load with madvise enabled THP\" series is at\nv6 and under review by Carlos -- great, that covers BZ #34079 / BZ #34080\nwell, and I am not trying to compete there.\n\nFor BZ #34083 specifically, the malloc commit b7b121c on your branch\n(\"malloc: Don't call __get_thp_mode/__get_thp_size twice\") does not\nappear to have been posted to libc-alpha. A search of the archive for\nthat subject returns no results, so currently the only public patch\naddressing #34083 is mine.\n\nIf you plan to post b7b121c as a follow-up to the v6 series, please let\nme know the timing and I am happy to wait, withdraw, or rebase.\nOtherwise, could my standalone caching fix for #34083 land? It is\nindependent of the madvise rework, and your malloc commit could rebase\non top trivially if you decide to post it later.\n\nThanks,\nShamil","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=IHD3RhFf;\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=IHD3RhFf","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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Lu","email":"hjl.tools@gmail.com"},"content":"On Sat, May 2, 2026 at 4:35 PM Shamil Abdulaev wrote:\n>\n> On Sat, May 2, 2026 at 6:27 AM H.J. Lu wrote:\n> > I took a different approach:\n> > https://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/hugepage/pr34083\n> >\n> > since 2 THP optimizations can be controlled independently. They share\n> > the same THP mode only if both are enabled.\n>\n> Thanks for the pointer.\n>\n> Your \"Support THP segment load with madvise enabled THP\" series is at\n> v6 and under review by Carlos -- great, that covers BZ #34079 / BZ #34080\n> well, and I am not trying to compete there.\n>\n> For BZ #34083 specifically, the malloc commit b7b121c on your branch\n> (\"malloc: Don't call __get_thp_mode/__get_thp_size twice\") does not\n> appear to have been posted to libc-alpha. A search of the archive for\n> that subject returns no results, so currently the only public patch\n> addressing #34083 is mine.\n>\n> If you plan to post b7b121c as a follow-up to the v6 series, please let\n> me know the timing and I am happy to wait, withdraw, or rebase.\n\nI will post my bz #34083 patch after my v6 THP patch is merged.\n\n> Otherwise, could my standalone caching fix for #34083 land? It is\n> independent of the madvise rework, and your malloc commit could rebase\n> on top trivially if you decide to post it later.\n>\n> Thanks,\n> Shamil","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=U7o7hSwB;\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=U7o7hSwB","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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Sat, 02 May 2026\n 01:41:11 -0700 (PDT)","MIME-Version":"1.0","References":"\n \n \n <20260502083508.2988767-1-ashamil435@gmail.com>","In-Reply-To":"<20260502083508.2988767-1-ashamil435@gmail.com>","From":"\"H.J. Lu\" ","Date":"Sat, 2 May 2026 16:40:34 +0800","X-Gm-Features":"AVHnY4KkYKZ9WdB97pjRCDXGmLAdamZXcRWwUj8Qutfe9jq945apGHAWi7UTMCs","Message-ID":"\n ","Subject":"Re: [PATCH] hugepages: cache THP mode and page size [BZ #34083]","To":"Shamil Abdulaev ","Cc":"libc-alpha@sourceware.org","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":3685262,"web_url":"http://patchwork.ozlabs.org/comment/3685262/","msgid":"","list_archive_url":null,"date":"2026-05-02T08:54:26","subject":"Re: [PATCH] hugepages: cache THP mode and page size [BZ #34083]","submitter":{"id":93241,"url":"http://patchwork.ozlabs.org/api/people/93241/","name":"Shamil Abdulaev","email":"ashamil435@gmail.com"},"content":"> I will post my bz #34083 patch after my v6 THP patch is merged.\n\nUnderstood, withdrawing mine. Thanks.\n\n\nOn Sat, May 02, 2026 11:41 AM, \"H.J. Lu\" wrote:\n\n> On Sat, May 2, 2026 at 4:35 PM Shamil Abdulaev \n> wrote:\n> >\n> > On Sat, May 2, 2026 at 6:27 AM H.J. Lu wrote:\n> > > I took a different approach:\n> > >\n> https://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/hugepage/pr34083\n> > >\n> > > since 2 THP optimizations can be controlled independently. They share\n> > > the same THP mode only if both are enabled.\n> >\n> > Thanks for the pointer.\n> >\n> > Your \"Support THP segment load with madvise enabled THP\" series is at\n> > v6 and under review by Carlos -- great, that covers BZ #34079 / BZ #34080\n> > well, and I am not trying to compete there.\n> >\n> > For BZ #34083 specifically, the malloc commit b7b121c on your branch\n> > (\"malloc: Don't call __get_thp_mode/__get_thp_size twice\") does not\n> > appear to have been posted to libc-alpha. A search of the archive for\n> > that subject returns no results, so currently the only public patch\n> > addressing #34083 is mine.\n> >\n> > If you plan to post b7b121c as a follow-up to the v6 series, please let\n> > me know the timing and I am happy to wait, withdraw, or rebase.\n>\n> I will post my bz #34083 patch after my v6 THP patch is merged.\n>\n> > Otherwise, could my standalone caching fix for #34083 land? It is\n> > independent of the madvise rework, and your malloc commit could rebase\n> > on top trivially if you decide to post it later.\n> >\n> > Thanks,\n> > Shamil\n>\n>\n>\n> --\n> H.J.\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=BNZfyHDe;\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=BNZfyHDe","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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Sat, 02 May 2026\n 01:55:01 -0700 (PDT)","MIME-Version":"1.0","References":"\n \n \n <20260502083508.2988767-1-ashamil435@gmail.com>\n ","In-Reply-To":"\n ","From":"Shamil Abdulaev ","Date":"Sat, 2 May 2026 11:54:26 +0300","X-Gm-Features":"AVHnY4LmBA48kW6-1VqTWZ5VmcfHiTK2B2fwDvyF4pi26uFBLLfG8lk3mV-tzho","Message-ID":"\n ","Subject":"Re: [PATCH] hugepages: cache THP mode and page size [BZ #34083]","To":"hjl.tools@gmail.com","Cc":"libc-alpha@sourceware.org","Content-Type":"multipart/alternative; boundary=\"00000000000053a8360650d1da94\"","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"}}]