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{ "id": 2224689, "url": "http://patchwork.ozlabs.org/api/1.2/covers/2224689/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/cover/cover.1776449736.git.dj@redhat.com/", "project": { "id": 41, "url": "http://patchwork.ozlabs.org/api/1.2/projects/41/?format=api", "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": "<cover.1776449736.git.dj@redhat.com>", "list_archive_url": null, "date": "2026-04-17T18:15:36", "name": "[v7,0/4] Add system-wide tunables", "submitter": { "id": 4388, "url": "http://patchwork.ozlabs.org/api/1.2/people/4388/?format=api", "name": "DJ Delorie", "email": "dj@redhat.com" }, "mbox": "http://patchwork.ozlabs.org/project/glibc/cover/cover.1776449736.git.dj@redhat.com/mbox/", "series": [ { "id": 500385, "url": "http://patchwork.ozlabs.org/api/1.2/series/500385/?format=api", "web_url": "http://patchwork.ozlabs.org/project/glibc/list/?series=500385", "date": "2024-02-21T23:49:50", "name": "Add system-wide tunables", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/500385/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2224689/comments/", "headers": { "Return-Path": "<libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org>", "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=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=Nvu2cEPn;\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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a=rsa-sha256; d=sourceware.org; s=key;\n t=1776449918; c=relaxed/simple;\n bh=NM19fZEOirnfoSBU+iTiHQ0NxlwnWfmNq9DF1O7Ho0k=;\n h=DKIM-Signature:Message-ID:From:Date:Subject:To;\n b=nfG0Y27DmQA4zoxH9SLc2qLxALOcVmr7S4xgY9az7KOo4ur4zqSx6U6WiAf6nwCKYhkKWtwxjrKlrIpnY+8SpUvo+6rywClw8pQzVKvI9f7SnfX3u3x0qj3TTq8jNm1MeApd5JQ5H8iHpBNG5Aw3Rfus0RJ6eCpsWn0NoquYSd4=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1776449918;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:content-type:content-type;\n bh=csdwXxkXy4bJM6su5uOTyFfrJ0pDKK7MZ0/RutJ+61E=;\n b=Nvu2cEPnUzAYy88zSKmCWLVmm+iEepHt35RUFOroQrmayTh+bT5ARLuvspzghbY5c1de2g\n Qybdc+z2kvSBBV5XY1FJpkej8vrcwS1VeyMH38aKjlax7KZ3X5Q9aJibWG0ejmEuLMs3kO\n XXMXr1QfSDcci+EO6TNm2DsyEVVqJYE=", "X-MC-Unique": "TokTt8InMFGxq9wvSqg4lQ-1", "X-Mimecast-MFC-AGG-ID": "TokTt8InMFGxq9wvSqg4lQ_1776449916", "Message-ID": "<cover.1776449736.git.dj@redhat.com>", "From": "DJ Delorie <dj@redhat.com>", "Date": "Fri, 17 Apr 2026 14:15:36 -0400", "Subject": "[PATCH v7 0/4] Add system-wide tunables", "To": "libc-alpha@sourceware.org", "X-Scanned-By": "MIMEDefang 3.0 on 10.30.177.17", "X-Mimecast-Spam-Score": "2", "X-Mimecast-MFC-PROC-ID": "k1esTqC-UfbL5-n8bQDVBbTbVgxJ7nhhAw1ZBvE1dHE_1776449916", "X-Mimecast-Originator": "redhat.com", "Content-type": "text/plain; charset=UTF-8", "X-BeenThere": "libc-alpha@sourceware.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Libc-alpha mailing list <libc-alpha.sourceware.org>", "List-Unsubscribe": "<https://sourceware.org/mailman/options/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>", "List-Archive": "<https://sourceware.org/pipermail/libc-alpha/>", "List-Post": "<mailto:libc-alpha@sourceware.org>", "List-Help": "<mailto:libc-alpha-request@sourceware.org?subject=help>", "List-Subscribe": "<https://sourceware.org/mailman/listinfo/libc-alpha>,\n <mailto:libc-alpha-request@sourceware.org?subject=subscribe>", "Errors-To": "libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org" }, "content": "This patch series is the initial implementation of system-wide\ntunables, which I mentioned a while ago.\n\nThe first part has ldconfig read tunable information from\n/etc/tunables.conf and store it to /etc/ld.so.cache. Reusing ldconfig\nmeans no new documentation or training would be required of sysadmins,\nor reprogramming of distro packaging.\n\nThe second part optimizes the loading of /etc/ld.so.cache and allows\nfor it to be loaded independently of searching for libraries, so that\ntunables information can be loaded as needed.\n\nThe third part applies the stored tunable information to the running\napplication.\n\nThe fourth part adds simple filtering, allowing the admin to override\nor augment tunables on a per-process basis, like this:\n\n glibc.malloc.whatever=10\n [proc:/usr/bin/qemu]\n glibc.malloc.whatever=20\n\nNote that such filters only last until EOF or the beginning of the\nnext included config file.\n\nChanges since v1: fixed format bug in error() and rebased. No other\n changes.\n\nChanges since v2: Added per-process filter. Rebased. Probably various\n tweaks and minor changes.\n\nChanges since v3/v4: printf cleanups, remove custom dl_str*()\n functions, off-by-one error, new [proc:*] syntax.\n\nChanges since v5:\n - rebase on ldconfig parseconf breakout\n - makes callback's line non-const\n - use error_at_line instead of printf\n - fix tunable list length logic\n - add ld.so.cache caching test\n - optimize cache \"dirty\" logic\n - remove unneded -DUSE_LDCONFIG\n - add AT_SECURE logic and filters\n - ldconfig parser: pass NULL line at file boundaries\n\nChanges since v6:\n - elf/tunconf.c : fix whitespace issues\n - elf/cache.c : free tunable_data\n - elf/cache.c : check extensions for overflow\n - elf/dl-cache.c : fix tmp_cachesize logic\n - elf/dl-cache.c : comment style tweaks\n - elf/dl-cache.c : remove superfluous comment\n - elf/dl-cache.c : additional data validation\n - elf/tunconf.c : fix whitespace issues\n - elf/tunconf.c : use error_at_line instead of printf\n - elf/tunconf.c : fix buffer overflow, add comments.\n\nDJ Delorie (4):\n Add system-wide tunables: ldconfig part\n Add system-wide tunables: cache ld.so.cache\n Add system-wide tunables: Apply tunables part\n Add system-wide tunables: Filters\n\n csu/libc-start.c | 2 +-\n elf/Makefile | 8 +\n elf/cache.c | 71 +++-\n elf/dl-cache.c | 303 ++++++++++----\n elf/dl-tunables.c | 137 +++++-\n elf/dl-tunables.h | 2 +-\n elf/ldconfig-parse.c | 6 +-\n elf/ldconfig.c | 26 +-\n elf/tst-ldconfig-cache.c | 134 ++++++\n elf/tst-ldconfig-cache.root/etc/ld.so.conf | 3 +\n elf/tst-ldconfig-cache.root/ldconfig.req | 0\n .../tst-ldconfig-cache.script | 7 +\n elf/tst-tunconf1.c | 36 ++\n elf/tst-tunconf1.root/etc/tunables.conf | 15 +\n elf/tst-tunconf1.root/ldconfig.run | 0\n elf/tst-tunconf1.root/postclean.req | 0\n elf/tunconf.c | 389 ++++++++++++++++++\n elf/tunconf.h | 46 +++\n sysdeps/generic/dl-cache.h | 6 +\n sysdeps/generic/ldconfig.h | 6 +-\n sysdeps/mach/hurd/dl-sysdep.c | 2 +-\n sysdeps/unix/sysv/linux/dl-sysdep.c | 2 +-\n 22 files changed, 1099 insertions(+), 102 deletions(-)\n create mode 100644 elf/tst-ldconfig-cache.c\n create mode 100644 elf/tst-ldconfig-cache.root/etc/ld.so.conf\n create mode 100644 elf/tst-ldconfig-cache.root/ldconfig.req\n create mode 100644 elf/tst-ldconfig-cache.root/tst-ldconfig-cache.script\n create mode 100644 elf/tst-tunconf1.c\n create mode 100644 elf/tst-tunconf1.root/etc/tunables.conf\n create mode 100644 elf/tst-tunconf1.root/ldconfig.run\n create mode 100644 elf/tst-tunconf1.root/postclean.req\n create mode 100644 elf/tunconf.c\n create mode 100644 elf/tunconf.h" }