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 064E2D5B17D for ; Mon, 15 Dec 2025 15:05:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 69DFE6B0062; Mon, 15 Dec 2025 10:04:59 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 627A46B0088; Mon, 15 Dec 2025 10:04:59 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4F0136B0089; Mon, 15 Dec 2025 10:04:59 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 376CD6B0062 for ; Mon, 15 Dec 2025 10:04:59 -0500 (EST) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 06A4813352C for ; Mon, 15 Dec 2025 15:04:59 +0000 (UTC) X-FDA: 84222027918.02.0C06D75 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf08.hostedemail.com (Postfix) with ESMTP id 5790016000A for ; Mon, 15 Dec 2025 15:04:57 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf08.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1765811097; a=rsa-sha256; cv=none; b=6A2HtfrJqxZgh3fn0Uj8tuaLgOzPIkmrA1EQy8WxIXEf7nw5uHCVBcI8xHKlPnZq3o6YnI 3muxZ96CGsFxkeFO9FOTOKCHPZzRpAYklEiY9JfdSdWPqgOWSHWdPC1XCsQGRLZu4UQBse Dltypd2JEVrDVqZob/VIjYbAbsVWKP8= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf08.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1765811097; 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; bh=c1HVE5iTJsVXawLpc/SH/1Lz2/bA9CTwze4YimX69RY=; b=rtZEPXb6o13cOYgUVYFWCqRWrY99KwDssR1nVHufQ4rJu1WuLKxrdzuGAF63RQXMSwrOWz tQGBrcE94vVW1zo/f1TZmJEMmrK0LRvCBjekgzo7/oxDVfBpboXPr1EZAwgWXUHWH5HATh GrD5z+QVMvLyduACizqhsTixgH/PMxs= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 62D991713; Mon, 15 Dec 2025 07:04:49 -0800 (PST) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 41F803F73B; Mon, 15 Dec 2025 07:04:51 -0800 (PST) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Alexander Gordeev , Andreas Larsson , Andrew Morton , Anshuman Khandual , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , David Woodhouse , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , "Ritesh Harjani (IBM)" , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Venkat Rao Bagalkote , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Subject: [PATCH v6 14/14] mm: Add basic tests for lazy_mmu Date: Mon, 15 Dec 2025 15:03:23 +0000 Message-ID: <20251215150323.2218608-15-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251215150323.2218608-1-kevin.brodsky@arm.com> References: <20251215150323.2218608-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5790016000A X-Rspamd-Server: rspam03 X-Stat-Signature: ezytfcfsgcq8y15pg5o8rmatbj1exorq X-Rspam-User: X-HE-Tag: 1765811097-667963 X-HE-Meta: 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 7KuUeRsj dOFGBhUTrtyv63TDuIg9toXovbw9HJGwCz6axKHDMPDuWnwyPiyn7L+rlViV0j/Pi8QsieU7/3xg65hthTV5ouA5ExFMWwioMFxTaTIUbpnEgVqTiiw1eX+ceI94toVv6VV4w/WEF/5Ec+mLLvodVTOs2Pwddjgixnqu1KrHdl5c0miGF+j6aOgRjO8hkqeRwAFOcjJxeBu8NMxzfnxAtsKVpt66wOxPjQuzW36/uuFMiktPWtbko9Go0PlomQirNuagDvPGYt8zHkZ2dSvcGM2wPTA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add basic KUnit tests for the generic aspects of the lazy MMU mode: ensure that it appears active when it should, depending on how enable/disable and pause/resume pairs are nested. Signed-off-by: Kevin Brodsky --- mm/Kconfig | 12 ++++++ mm/Makefile | 1 + mm/tests/lazy_mmu_mode_kunit.c | 71 ++++++++++++++++++++++++++++++++++ 3 files changed, 84 insertions(+) create mode 100644 mm/tests/lazy_mmu_mode_kunit.c diff --git a/mm/Kconfig b/mm/Kconfig index 62073bd61544..ac48deb44884 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1471,6 +1471,18 @@ config ARCH_HAS_LAZY_MMU_MODE MMU-related architectural state to be deferred until the mode is exited. See for details. +config LAZY_MMU_MODE_KUNIT_TEST + tristate "KUnit tests for the lazy MMU mode" if !KUNIT_ALL_TESTS + depends on ARCH_HAS_LAZY_MMU_MODE + depends on KUNIT + default KUNIT_ALL_TESTS + help + Enable this option to check that the lazy MMU mode interface behaves + as expected. Only tests for the generic interface are included (not + architecture-specific behaviours). + + If unsure, say N. + source "mm/damon/Kconfig" endmenu diff --git a/mm/Makefile b/mm/Makefile index 2d0570a16e5b..9175f8cc6565 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -147,3 +147,4 @@ obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o obj-$(CONFIG_EXECMEM) += execmem.o obj-$(CONFIG_TMPFS_QUOTA) += shmem_quota.o obj-$(CONFIG_PT_RECLAIM) += pt_reclaim.o +obj-$(CONFIG_LAZY_MMU_MODE_KUNIT_TEST) += tests/lazy_mmu_mode_kunit.o diff --git a/mm/tests/lazy_mmu_mode_kunit.c b/mm/tests/lazy_mmu_mode_kunit.c new file mode 100644 index 000000000000..2720eb995714 --- /dev/null +++ b/mm/tests/lazy_mmu_mode_kunit.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include + +static void expect_not_active(struct kunit *test) +{ + KUNIT_EXPECT_FALSE(test, is_lazy_mmu_mode_active()); +} + +static void expect_active(struct kunit *test) +{ + KUNIT_EXPECT_TRUE(test, is_lazy_mmu_mode_active()); +} + +static void lazy_mmu_mode_active(struct kunit *test) +{ + expect_not_active(test); + + lazy_mmu_mode_enable(); + expect_active(test); + + { + /* Nested section */ + lazy_mmu_mode_enable(); + expect_active(test); + + lazy_mmu_mode_disable(); + expect_active(test); + } + + { + /* Paused section */ + lazy_mmu_mode_pause(); + expect_not_active(test); + + { + /* No effect (paused) */ + lazy_mmu_mode_enable(); + expect_not_active(test); + + lazy_mmu_mode_disable(); + expect_not_active(test); + + lazy_mmu_mode_pause(); + expect_not_active(test); + + lazy_mmu_mode_resume(); + expect_not_active(test); + } + + lazy_mmu_mode_resume(); + expect_active(test); + } + + lazy_mmu_mode_disable(); + expect_not_active(test); +} + +static struct kunit_case lazy_mmu_mode_test_cases[] = { + KUNIT_CASE(lazy_mmu_mode_active), + {} +}; + +static struct kunit_suite lazy_mmu_mode_test_suite = { + .name = "lazy_mmu_mode", + .test_cases = lazy_mmu_mode_test_cases, +}; +kunit_test_suite(lazy_mmu_mode_test_suite); + +MODULE_DESCRIPTION("Tests for the lazy MMU mode"); +MODULE_LICENSE("GPL"); -- 2.51.2