From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 408CC3E1209; Thu, 11 Jun 2026 11:28:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781177333; cv=none; b=Z6DoPwWp6AHuqNrPmlJYPdf3wBwzjmXAaAR2KFaD8QnPLmEd7CgZVt/gzB5IfLIPrXvW+rwvVmH+FhrZ/jpTIAnPK7Wr8xD0Wruuvt2S1A3ZS4FO1LoIPFYc6DdEZbQ6a1NZGgzyhDKglU/bnckEIwRjBwrjIqp1OU7XdibQJyY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781177333; c=relaxed/simple; bh=fDfCQJhcd09WYJANwFXRSGh4CZ6yAMijmlQan7cE+uA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=pDXwyfCXOVSQO+0skxwvbQHaG/GH9IftMc2TqckwyLLasSMzGiEDdvLxRhBRDMJU+YmTX8J46Ej0hWB8hSA2oKdkC5OpSZMQsX+o4nMwo7VTnaltIfh53PqiO8fPH4eDU40LPPs+EWe4dPDhQjrqZ62jryf71lF6IvOTc7J05Mg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=bHjGb2ot; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="bHjGb2ot" 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 967E41E2F; Thu, 11 Jun 2026 04:28:43 -0700 (PDT) Received: from [10.164.19.15] (unknown [10.164.19.15]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7C7B13F99C; Thu, 11 Jun 2026 04:28:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1781177328; bh=fDfCQJhcd09WYJANwFXRSGh4CZ6yAMijmlQan7cE+uA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=bHjGb2otGj8sHCXHA+REFVDEOzYnKhmAI5WIOTMF8IpIMBEg+oEHergt2V6NO2f45 d58PoItW0n3OB+mLvrQWvM7+7ob2xpfkyLXlPL3yO8bfEzjfBUrPQlFyjZuo6PJaCV Ymyyg4JfhH+bvIM6ayEiyn0uR2gVd4bTJzy27ayQ= Message-ID: <9f6ece0a-659d-4bbc-a61d-f70826026cf1@arm.com> Date: Thu, 11 Jun 2026 16:58:40 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests: mm: fix and speedup "droppable" test To: "David Hildenbrand (Arm)" , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , "Jason A. Donenfeld" , Anthony Yznaga , Mark Brown , Sarthak Sharma Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Aishwarya TCV References: <20260611-droppable_test-v1-1-b6a73d99f658@kernel.org> Content-Language: en-US From: Dev Jain In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/06/26 4:56 pm, David Hildenbrand (Arm) wrote: >>> + /* >>> + * Speculative reference can temporarily prevent some >>> + * pages from getting dropped. So sleep and retry. >>> + * >>> + * If a page is not droppable for 10s, something >>> + * is seriously messed up and we want to fail. >>> + */ >>> + if (dropped) >>> + break; >>> + sleep(1); >>> } >>> - kill(child, SIGTERM); >>> >>> - ksft_test_result_pass("MAP_DROPPABLE: PASS\n"); >>> - exit(KSFT_PASS); >>> + ksft_test_result(dropped, "madvise(MADV_PAGEOUT) behavior\n"); >> >> You meant "MAP_DROPPABLE" behaviour? Perhaps that can be folded in. > > No, I did mean "madvise(MADV_PAGEOUT)" behaves as expected with droppable pages. > > Reasoning being that we might want to add some other tests in the future that > trigger reclaim differently. Makes sense. > > Thanks! >