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Mon, 8 Sep 2025 12:48:04 +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-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 31F3830001B5; Mon, 8 Sep 2025 12:47:57 +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 v2 2/3] selftests/mm: alloc hugepages in va_high_addr_switch test Date: Mon, 8 Sep 2025 20:47:38 +0800 Message-ID: <20250908124740.2946005-3-chuhu@redhat.com> In-Reply-To: <20250908124740.2946005-2-chuhu@redhat.com> References: <20250908124740.2946005-1-chuhu@redhat.com> <20250908124740.2946005-2-chuhu@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: B880F1C0003 X-Stat-Signature: srwyfiwdt55stof6ci5azxz9jfwy6a4z X-HE-Tag: 1757335689-954553 X-HE-Meta: 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 cFofICVL GqM7Y/DSJlaPkpJGaTaGo90C39G6S9OPwrkT1h4ZxJqKU6V89S9O//MUm94eqO54B8V9WINCwhRQb8n8kWWuu3mFpbLo69W6yBMfkLgJtkZCc8GGA3sTBxdI8I0m6I0s7Kl1abp+zhNhKMLK/FZ1MxuCdiq1S1daOrQ/rpSnxKKzkJ51rVRAhio7Aja0oX6lLfGcNaI2FPyfpky7mocoo/nRLKwUWTobCLGCbfW5HwUIi37C2WVfzHxN8Di87aWKdezaze5qcce9OTyReN7xoHhh5HTSsztJSaqF//DDbMaNW04hKSmPB/s/Wu/XLqPwFwcgz5cc0C+BsUBAGE7j+ff9UsSnxR8cfQWPS0Mz18bG6iPTb05vPzla7fFmdKIsAQATAYTzP1ywZFCOKTpkvS1NsoX3PQYiofhkY 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