[{"id":3677606,"web_url":"http://patchwork.ozlabs.org/comment/3677606/","msgid":"<ad92RqkcuP26hiQ1@arm.com>","list_archive_url":null,"date":"2026-04-15T11:28:06","subject":"Re: [PATCH v2] tests: allow tests to append tunables","submitter":{"id":88214,"url":"http://patchwork.ozlabs.org/api/people/88214/","name":"Yury Khrustalev","email":"yury.khrustalev@arm.com"},"content":"On Mon, Apr 13, 2026 at 03:26:18PM +0100, Yury Khrustalev wrote:\n> Many tests use Glibc tunables. The tunable values are provided via\n> the GLIBC_TUNABLES env variable. Tests set it in makefiles using\n> \n>   tst-foo-ENV = GLIBC_TUNABLES=tunable=value\n> \n> This overwrites environment for this test, so if another env var is\n> set elsewhere, one of these changes would be lost. The correct way\n> should be to append to test's environment:\n> \n>   tst-foo-ENV += GLIBC_TUNABLES=tunable=value\n> \n> However, if two or more tunables need to be set for the same test,\n> the 'tunable=value' part should be appended to previously defined\n> GLIBC_TUNABLES env variable.\n> \n> This commit adds 'tunable-add' that can be used to correctly append\n> another tunable to a test's environment. We also change tests in the\n> malloc and misc folder.\n\nIf it is better to use something like as suggested in [1]\n\n  tst-foo-TUNABLES\n\ninstead of modifying the whole environment of the test via\n\n  tst-foo-ENV += GLIBC_TUNABLES=tunable=value\n\nor\n\n  $(eval $(call tunable-add, ...))\n\nI can certainly look into this and send another patch. This might be a\nbetter way of doing it.\n\nThanks,\nYury\n\n----\n[1]: https://inbox.sourceware.org/libc-alpha/53ce1324-63a9-488b-955b-99700e4fdcd6@linaro.org","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=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=jk/WpmLy;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=jk/WpmLy;\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 (1024-bit key,\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=jk/WpmLy;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=jk/WpmLy","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=arm.com","sourceware.org; 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