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Thu, 11 Sep 2025 21:37:37 -0400 X-MC-Unique: CIga5bGjOuq_NhGaIzdmDw-1 X-Mimecast-MFC-AGG-ID: CIga5bGjOuq_NhGaIzdmDw_1757641056 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E05641956087; Fri, 12 Sep 2025 01:37:35 +0000 (UTC) Received: from dell-per7425-02.rhts.eng.pek2.redhat.com (dell-per7425-02.rhts.eng.pek2.redhat.com [10.73.116.18]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 18FDD1800452; Fri, 12 Sep 2025 01:37:29 +0000 (UTC) From: Chunyu Hu To: akpm@linux-foundation.org, david@redhat.com, shuah@kernel.org, linux-mm@kvack.org Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, chuhu@redhat.com Subject: [PATCH v3 2/3] selftests/mm: alloc hugepages in va_high_addr_switch test Date: Fri, 12 Sep 2025 09:37:10 +0800 Message-ID: <20250912013711.3002969-3-chuhu@redhat.com> In-Reply-To: <20250912013711.3002969-2-chuhu@redhat.com> References: <20250912013711.3002969-1-chuhu@redhat.com> <20250912013711.3002969-2-chuhu@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: A73E7A0006 X-Stat-Signature: ccxb7qkncnqpnzghqjszq1oga74tirs1 X-Rspam-User: X-HE-Tag: 1757641061-780957 X-HE-Meta: U2FsdGVkX1+KDpi0Wcy0YkY/wUaWVuqUq0Xh4H9RjiiaOQXXIDc97tSlIAxLIYDh+rQVQ/2Sl1eIomklYWXcYQoATbw3OwKgqiRR5obDWbgIFlm46hj28Pr8l1q1oj15TWDSq8aC/bf7efi7cmV4rT2Xbv/soZurJ6yJXDpRU35KmBJeVK/qxoxKH5fWoi3Eo1of7fzYxQ2yK4GwYpdrAESzc6zl7bmknZ7LYpU3BBElE1EjKPKe3Yl2Zxa2gu06S4CzEftqWKdDkL3t4K5Gw2O4xomX+xGPpQpr5jX2sstmZH5u7ovhkl4MRdzArmFqwRfTG8YZ1iro0xUDURBOzshU8+jjAQBsjVe12o0KbnRukMC7uXLAi5LOOhc0Ipsfl1SpJy4XpMgfKOL49o7bGlFaMTzRIYs8GsQx14ZRjSTNojB3hsvC1F+4gLtupTpTtME9u5rPH8XKg0vv5VNchF50Wb73LPqR9c2ysJ7lPyNGb2afIGwDVUL+jtALptQ6lBv2I/LL8kgVpx1VKLk/RaayO0dIvn1PP1QASYoesHBAVvgqccW6pUT3qpdwMqbk1rcAMW5wnmtIE30bihj+CFj6HMmL/bSSYFidcoPh7g45cxuRd07MZg5aBpa+NHLBeI9+xSzc8oX3C96bjeDl5qBQhtQ/S5qccq7GVB6nVrfxq7bkMQOniuJ+Wm+WT2h0PCPNLoKQEArRN0835Qi7h2aWQZIuXC2bZvOxTBj1y3PkLntIjNRjf8ncabqr4pge8dJGWvTPglZ1oZQTDE4ckHqBTpeHKcGfolqKRovrINlj4pPu1iga1S7nanIfX9krz/CrZPX+4zmsHJVrvBa6OmzY5Nc4UIVLtbrMAyzJpeHAwZ0cYyyH7YNv1WPCU+k2niV/WyaifKBWqK4YMc8qwtcAuuZjb0yB1r6X4Wj7KdHipa/I/xbo5AopRnEEnJTOz4vhpW3LMiDs7MxpvH0 o3K7LGRw UMctdkUX3ExkS+sZzfuxxhmyTmQQNDZyyqHEouTzWjB67oPcm8aw02I/S24D9oYvv+QDWQmtE16Sq9Cp5Egilkh5Ie4G4NCziNAoyyhQMh9TTB+yQhEobxSyhqynQ/RLZxon66gUBXdamlWuzs1Hp9AhgEL9kHE6c+25ud5Mrd/3mOdOmoVPFpasnOSCw0tRNnjE4C2MjGHSQWbofBEbg/v4D1AuQNNRBreGOLlTCu4+EmkTP8Cy3mmPYgt5a1ELjm2yIWBgAYJOZdJUqPg7vjB+1krKCI/2oktLGNXkls0WjWBh96CCaZXnHrpArUZLOk7HJ06/nFwLsh2o6pqMAfnbmrUpaxNZZZmhtQmWWe2tliGXqzAMvSY29J1Dkk/g1OnsBglcT13xat8zpez2G3D9lCU6QJDCqCubW 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: Alloc hugepages in the test internally, so we don't fully rely on the run_vmtests.sh. If run_vmtests.sh does that great, free hugepages is enough for being used to run the test, leave it as it is, otherwise setup the hugepages in the test. Save the original nr_hugepages value and restore it after test finish, so leave a stable test envronment. Signed-off-by: Chunyu Hu --- .../selftests/mm/va_high_addr_switch.sh | 37 +++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/tools/testing/selftests/mm/va_high_addr_switch.sh b/tools/testing/selftests/mm/va_high_addr_switch.sh index 325de53966b6..a7d4b02b21dd 100755 --- a/tools/testing/selftests/mm/va_high_addr_switch.sh +++ b/tools/testing/selftests/mm/va_high_addr_switch.sh @@ -9,6 +9,7 @@ # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 +orig_nr_hugepages=0 skip() { @@ -76,5 +77,41 @@ check_test_requirements() esac } +save_nr_hugepages() +{ + orig_nr_hugepages=$(cat /proc/sys/vm/nr_hugepages) +} + +restore_nr_hugepages() +{ + echo "$orig_nr_hugepages" > /proc/sys/vm/nr_hugepages +} + +setup_nr_hugepages() +{ + local needpgs=$1 + while read -r name size unit; do + if [ "$name" = "HugePages_Free:" ]; then + freepgs="$size" + break + fi + done < /proc/meminfo + if [ "$freepgs" -ge "$needpgs" ]; then + return + fi + local hpgs=$((orig_nr_hugepages + needpgs)) + echo $hpgs > /proc/sys/vm/nr_hugepages + + local nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages) + if [ "$nr_hugepgs" != "$hpgs" ]; then + restore_nr_hugepages + skip "$0: no enough hugepages for testing" + fi +} + check_test_requirements +save_nr_hugepages +# 4 keep_mapped pages, and one for tmp usage +setup_nr_hugepages 5 ./va_high_addr_switch --run-hugetlb +restore_nr_hugepages -- 2.49.0