From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E0979F46C46 for ; Mon, 6 Apr 2026 14:20:31 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5036B6B00CB; Mon, 6 Apr 2026 10:20:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4B4316B00CD; Mon, 6 Apr 2026 10:20:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3F1EE6B00CE; Mon, 6 Apr 2026 10:20:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 2FEB46B00CB for ; Mon, 6 Apr 2026 10:20:31 -0400 (EDT) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id E4D2F13ACEF for ; Mon, 6 Apr 2026 14:20:30 +0000 (UTC) X-FDA: 84628341420.02.3A29081 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf24.hostedemail.com (Postfix) with ESMTP id 4557F18000E for ; Mon, 6 Apr 2026 14:20:29 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=qPJrWVSY; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf24.hostedemail.com: domain of rppt@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=rppt@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1775485229; a=rsa-sha256; cv=none; b=Riu1MX+aN/+a9IMtC50cB+IwyfOwWFvTJs1/JDjjf6vj58pPGDPfAlY6oZ8lKT7G/SGcAL BdUfGdd/E/fAMhOdX46IEWp6g46s5RrogXTLqhT5SHTomv67bV9ggHmty8DQ8/8ZZHXg1j EiBcs5x9KugyHDSRQbtNwawsyRWt4jY= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=qPJrWVSY; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf24.hostedemail.com: domain of rppt@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=rppt@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1775485229; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=x3KYmiOhib6UgMB+RvvAlGmKtMO4Cjsc7yUgYi6viDk=; b=Pg8vLSZQ+LD0CeXfzzF2Lld8610zyVm/gnnlCJOfIH8cOnZ4eMJJyv2Svh4vAG70vFC56M 5xcdxBGTb81B9DyF0YjiWqCUkDseLlwkpdx+WhTAFKbB4J95uOuDyOpArsXGwcS/Of5iDz w5C778ML9EB0L3TAsj1dZCtQwnZdddk= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id D449B6012A; Mon, 6 Apr 2026 14:20:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4A920C4CEF7; Mon, 6 Apr 2026 14:20:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775485228; bh=tO4w/saWs4TngI1dGJjVb/BDaQv7f0xtr7dZaOtNvYY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qPJrWVSYPEcYgqWceoyxpdlNMa2cxJaWbuvyhl+Wf32f9z5uavVsPdQxgPzIrwgHQ N8JmXTzhzNKBsrEB70pVaZMU8CYlUI7oDNSG73oQXwTHZBInQf8/zwChhEaIZnzdVS Xwe6wmCtsUfN0mgHw1NR/CtQoMf0Q4dXbCl9SlPDX/LA8UuFZUz6m7xmu323Ikl8dr 0aNx9EcqzS47/Mpmpv03X7uHOccrv9ixIK7P8i2zRLkle+wyHtivXl0jNdkFuGxiEj 423+e1VWKXe/FPU3eIjleclk73L9pctdblACnQynTaVw1SujZj6LkUGuoIJX/kFibi aZ2lyEbPLiRrw== From: Mike Rapoport To: Andrew Morton , David Hildenbrand Cc: Baolin Wang , Barry Song , Dev Jain , Jason Gunthorpe , John Hubbard , "Liam R. Howlett" , Lance Yang , Leon Romanovsky , Lorenzo Stoakes , Mark Brown , Michal Hocko , Mike Rapoport , Nico Pache , Peter Xu , Ryan Roberts , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , Zi Yan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 28/53] selftests/mm: vm_util: add helpers to set and restore shm limits Date: Mon, 6 Apr 2026 17:17:10 +0300 Message-ID: <20260406141735.2179309-29-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260406141735.2179309-1-rppt@kernel.org> References: <20260406141735.2179309-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 5m1yrt63sm5p7no8s78i8yqxpzox7xk9 X-Rspamd-Queue-Id: 4557F18000E X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1775485229-892837 X-HE-Meta: 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 YvWraTdU fmn31YEFQOUtpn6wqAz4Us9pPcXsKyWdxWoIZOyFomAbLTkmgbNGSwE+D55Zj6GG+Pt3j5dAjnyVnXt03aLFuTdSqDKn+0TXGowsMz7hT8hO/PDDdsnb2ON2DtWZwoynNPVeYexFV6INoCIGdBkjSAQw0ABTjx4N+HSr4RzAVE9l+8mlsBNE1BjovzECVkgQX8OfISYbodJIAbv3by994Ih9/KwvN0bpWlptbBPnCRumQmm2GWLllP1Ugx7pJaAwtuHoYol1dSkjOP2oZCgN6bfkojg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: "Mike Rapoport (Microsoft)" hugetlb-shm and thuge-gen tests require that limits defined by /proc/sys/kernel/{shmmax,shmall} should be higher than certain values. Add helpers that allow setting these limits and restoring their settings on a test exit. They will be used later in hugetlb-shm and thuge-gen. Signed-off-by: Mike Rapoport (Microsoft) --- tools/testing/selftests/mm/vm_util.c | 28 ++++++++++++++++++++++++++++ tools/testing/selftests/mm/vm_util.h | 9 +++++++++ 2 files changed, 37 insertions(+) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 752566f75c0b..5a89c2d903be 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -761,3 +761,31 @@ void write_num(const char *path, unsigned long num) sprintf(buf, "%lu", num); write_file(path, buf, strlen(buf) + 1); } + +static unsigned long shmall, shmmax; + +void __shm_limits_restore(void) +{ + if (shmmax) + write_num("/proc/sys/kernel/shmmax", shmmax); + if (shmall) + write_num("/proc/sys/kernel/shmall", shmall); +} + +void shm_limits_prepare(unsigned long length) +{ + unsigned long nr = length / psize(); + unsigned long val; + + val = read_num("/proc/sys/kernel/shmmax"); + if (val < length) { + write_num("/proc/sys/kernel/shmmax", length); + shmmax = val; + } + + val = read_num("/proc/sys/kernel/shmall"); + if (val < nr) { + write_num("/proc/sys/kernel/shmall", nr); + shmall = val; + } +} diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index 5fc9707f6b9a..ea8fc8fdf0eb 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -168,3 +168,12 @@ void write_file(const char *path, const char *buf, size_t buflen); int read_file(const char *path, char *buf, size_t buflen); unsigned long read_num(const char *path); void write_num(const char *path, unsigned long num); + +void shm_limits_prepare(unsigned long length); +void __shm_limits_restore(void); + +#define SHM_LIMITS_RESTORE() \ +static void __attribute__((destructor)) shm_limits_restore(void) \ +{ \ + __shm_limits_restore(); \ +} -- 2.53.0