From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm2-f2.google.com (mail-wm2-f2.google.com [74.125.225.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 31CAE2EAB6F for ; Wed, 15 Jul 2026 13:34:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.225.130 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784122481; cv=none; b=tf8ZhrAinXAzwrv6n6UNkaa6uFsIVF4IMBnPqfZq5HiNnzxJAXzY9FKxgz+hGlQox+0dQeBii/EOhd+hXG2e66redq7SOgHApXjgJE5q8pUGICXqYtmkiusBCio02Z5KaTOKoE3PiLtHSILMWWsXiwLRI382VoxYhPIcDsLJ8og= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784122481; c=relaxed/simple; bh=7kOnVrDgGdifj9QY0fXvftFGiW2qVdDptZ7neLyplqk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=SCy3nRv58ypGcLfDPJShxd5rfmo5pJ6r2F/PrOG7lclRCgutocqFzinNfgpyFAzPbRgEeXQDxn6m5ezhg1pI3zk2vw3YJvYc5fBpTgKnXLrgiQ3nN93nLm4U5NNihiSqn/0oYi7FsF3lc07g2ZIUr44xlch6NOLZ8jcHQcs8zoE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Pb0kqd9z; arc=none smtp.client-ip=74.125.225.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Pb0kqd9z" Received: by mail-wm2-f2.google.com with SMTP id 5b1f17b1804b1-4926d058720so5658475e9.0 for ; Wed, 15 Jul 2026 06:34:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1784122476; x=1784727276; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=gpdCEuNC6+ipebO3NzplfX4VLPuQi09kjzb5eK7FZmM=; b=Pb0kqd9zqfqr5HF+LSG37Rnug0Rh61OyAgJ+nywuhe1O2YJfIWiTUvNvXa4jrIsywI C25ptdAN2xl8qNntHLCwBHTAlFIpmlvW6jAfDXRbiT8CYEek24Cu4Ry3XVN+TnEzOjS7 IwcCoPEY/0HoTYK8g+OA5SnfeJldw1CPPfmfPW1WrNwzB3O2mpSgBxE9rM2E7a36yyde +HpBYqroDgIygy1u69GvATLsxjSc7l3tOVcuaq/r0C2mFStk0BJdAyA2ujCAJvkTJcu1 KwLZ5Zj7LBcGAQecfcDoBwOuBZnQuGCJpENWpNekxHitzNERIlmhmchxOAQOYkywPxlh fNug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784122476; x=1784727276; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=gpdCEuNC6+ipebO3NzplfX4VLPuQi09kjzb5eK7FZmM=; b=ar3cbaGP9Gp8mXqHAXz3KPlK42rhAnkguL+3TwXgz0WopUr68Bv7g3m3MSInTP7PZ3 9rPteliNpMmJ7GFF3Z2x8c4eNu/MFMp17wiXRjnNZY5m/KJaSSRx7OVdvY33ySOWDr09 PbOG0L18iHQYv6sM8mxy1c1TtiXkZ7tdaQUk2/HmGDomkhEFtYgyKILJyim/nRHX8FB+ f2/T6DpyPVDlWFNGO/Vx8+tUkRvW23v/OihRsYKiHmyxBuTA3I7BmdD0Qo9w9NioPMkb unErz+0vdRjRNQXhmPReyrlRJfabrrM0GUfSIvZUud06UEJESFsrzzeZhjHDHK5W8Wb4 pvUw== X-Forwarded-Encrypted: i=1; AHgh+RqnvfBJ1XBxDKm3dJIYmxFjRrnhUp9ON5xYj54JNiW+KX+dD14mxwxqdamSiz0LFIO2hkM1S+74dZTiXDW8R3s=@vger.kernel.org X-Gm-Message-State: AOJu0Yzu5t3lFn/rwJ/HmhXyOJzPsgmDJSbSRLXPk1Fp0MyqaLYysyhH tshjBzUrWBmyFbMmuMqZHIvIrfT2RJeh3BAYjoLPfhmLx1NaxwSG6nUn X-Gm-Gg: AfdE7cmfMDIsgJ3fS/+74onNFGxeLfnEvAD3hrW+PHGK3vUpfq0WqLi3sPC9NBgt6XH 8TdRd3QgAz+pEWICJGkC6++PO29noV6QXITnX2sZ2mJcP3jo09mEkSDNujgioK5BTgYjP57BysZ ue56hNBIdtDM7/8tGW85QAC3oCHKt28DMbjD15X89b7fbHS3UUp87HogOfc0B1l41IBVeXavlEg Zpc3oaHR82Dt8SIDWKng+pQ5LvXv+RfuwTAxWd6FaPJ68gCJVwIbZP3789O8Rac6+rd8wF6d9z6 x88gvCAHr5+U+kqSZWKFNlyX56M4i0UpG80c6FfCde/XJW30nvXa5QtUCBH2or3Q6NrmX4YO6DZ qZiyB22um7Z1UKDlITlYyjM7UhdTpz51VVi86w6bq+KQ1IqrDtMR/vo6hqaDyYyNPwsVFljXVt5 aKJHKw98NeIWiF57Hm153co/h4EY/YdMmoCHFwzbjO1rsWPVrWfLvIC6Z8G+ArcctaZnZnX0ncm j1gg1BSXZtMSfcr0Xr0hm0I2RQtpJVXxw== X-Received: by 2002:a05:600c:a00f:b0:495:3dd7:ef06 with SMTP id 5b1f17b1804b1-4953dd7f0bcmr26130985e9.12.1784122475929; Wed, 15 Jul 2026 06:34:35 -0700 (PDT) Received: from lima-kernel.. (host-123-106.campusbrigittenau.at. [78.104.123.106]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4950a322c86sm142033015e9.11.2026.07.15.06.34.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jul 2026 06:34:35 -0700 (PDT) From: Jaeyeon Lee To: Andrew Morton , David Hildenbrand , Shuah Khan Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Jaeyeon Lee Subject: [PATCH] selftests/mm: khugepaged: skip swap tests when swap is unavailable Date: Wed, 15 Jul 2026 15:34:17 +0200 Message-ID: <20260715133418.170386-1-jaeyeon.lee.dev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The collapse_swapin_single_pte and collapse_max_ptes_swap tests use MADV_PAGEOUT to swap out pages before verifying khugepaged collapse behavior. On systems without swap configured, MADV_PAGEOUT succeeds but the pages are not actually swapped out, so check_swap() returns false and the tests report a failure. These tests cannot run meaningfully without swap, so a missing swap area is an environment limitation rather than a test failure. Detect the absence of swap via /proc/swaps and skip the affected tests instead of failing them. Signed-off-by: Jaeyeon Lee --- tools/testing/selftests/mm/khugepaged.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/tools/testing/selftests/mm/khugepaged.c b/tools/testing/selftests/mm/khugepaged.c index 10e8dedcb087..f9b4ebe733ce 100644 --- a/tools/testing/selftests/mm/khugepaged.c +++ b/tools/testing/selftests/mm/khugepaged.c @@ -100,6 +100,22 @@ static void skip(const char *msg) exit_status = KSFT_SKIP; } +static bool swap_available(void) +{ + char buf[256]; + bool ret; + FILE *fp = fopen("/proc/swaps", "r"); + + if (!fp) + return false; + + fgets(buf, sizeof(buf), fp); + ret = !!fgets(buf, sizeof(buf), fp); + + fclose(fp); + return ret; +} + static void save_settings(void) { ksft_print_msg("Save THP and khugepaged settings..."); @@ -742,6 +758,9 @@ static void collapse_swapin_single_pte(struct collapse_context *c, struct mem_op ksft_exit_fail_perror("madvise(MADV_PAGEOUT)"); if (check_swap(p, page_size)) { success("OK"); + } else if (!swap_available()) { + skip("Swap is not available"); + goto out; } else { fail("Fail"); goto out; @@ -768,6 +787,9 @@ static void collapse_max_ptes_swap(struct collapse_context *c, struct mem_ops *o ksft_exit_fail_perror("madvise(MADV_PAGEOUT)"); if (check_swap(p, (max_ptes_swap + 1) * page_size)) { success("OK"); + } else if (!swap_available()) { + skip("Swap is not available"); + goto out; } else { fail("Fail"); goto out; @@ -785,6 +807,9 @@ static void collapse_max_ptes_swap(struct collapse_context *c, struct mem_ops *o ksft_exit_fail_perror("madvise(MADV_PAGEOUT)"); if (check_swap(p, max_ptes_swap * page_size)) { success("OK"); + } else if (!swap_available()) { + skip("Swap is not available"); + goto out; } else { fail("Fail"); goto out; base-commit: 7081238c5ca29839924f13bf5daa80763bc589f2 -- 2.43.0