From patchwork Thu Sep 26 15:20:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13813451 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E32241531DB for ; Thu, 26 Sep 2024 15:20:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727364059; cv=none; b=Qsn7y52t9RSeowb7kNQ6P8gyyc1JByOlYnpZvY2V7VbwZzU9zbT6qumpF1EU9TFmjVKIO398X5u0oVfosm38y+CT0sihgecuvRsEC+r4q3H1jW5xVM+wO+UAB0nGYPSFcUhva1JBHWU5XXvyTosE903eGRqIbcQy1RwCkMukfb4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727364059; c=relaxed/simple; bh=txWuXuILBv5S6sJcY8jEKBUNzgwD+nBQjS66HY/0zYE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MQTCEkfHY4rxNwSrocmCoKgHVwhpgDShcTYSLBC7j9BERRv7tEFvts220a+ZjXSgR3FshiMISX7BzwbWoMp6Eb8MZ0sI2PXM4Tkrja7kpGOjtvjpuH4CjpuHaopbbvpPZw9CP1dKDHeyEpWlcO08e6NFp2PyaAUeSQ1z7BFsJKI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=cYZgwxvY; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="cYZgwxvY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727364056; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dEU685hmTiGjO6vRfe2s3dQC7sd7dLb6c9biHu+eUc8=; b=cYZgwxvYFkqYW/I/Sdd0MU3zB8yIio3VM0/N6TaYxmEZRfDVwX9AuIgljR9o6uFsKXmcaK r+MatfWjlHCGli9m1ySOYd8r4XB230TDiL7XsxzFroCKSnHIxUvPPujj1JS47OKlP54hyC iSsHNtGsTaHtyIp7DSiBUzkOSEsVCgc= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-620-e8N7HJqHNUW0sILja7qzCw-1; Thu, 26 Sep 2024 11:20:54 -0400 X-MC-Unique: e8N7HJqHNUW0sILja7qzCw-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (unknown [10.30.177.40]) (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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 3681B190FEFC; Thu, 26 Sep 2024 15:20:53 +0000 (UTC) Received: from t14s.fritz.box (unknown [10.22.16.71]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C20001944D16; Thu, 26 Sep 2024 15:20:50 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, David Hildenbrand , Andrew Morton , Shuah Khan , Mario Casquero , Breno Leitao Subject: [PATCH v1 1/2] selftests/mm: hugetlb_fault_after_madv: use default hguetlb page size Date: Thu, 26 Sep 2024 17:20:43 +0200 Message-ID: <20240926152044.2205129-2-david@redhat.com> In-Reply-To: <20240926152044.2205129-1-david@redhat.com> References: <20240926152044.2205129-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 We currently assume that the hugetlb page size is 2 MiB, which is why we mmap() a 2 MiB range. Is the default hugetlb size is larger, mmap() will fail because the range is not suitable. If the default hugetlb size is smaller (e.g., s390x), mmap() will fail because we would need more than one hugetlb page, but just asserted that we have exactly one. So let's simply use the default hugetlb page size instead of hard-coded 2 MiB, so the test isn't unconditionally skipped on architectures like s390x. Before this patch on s390x: $ ./hugetlb_fault_after_madv 1..0 # SKIP Failed to allocated huge page With this change on s390x: $ ./hugetlb_fault_after_madv While at it, make "huge_ptr" static. Reported-by: Mario Casquero Signed-off-by: David Hildenbrand Reviewed-by: Shuah Khan --- .../selftests/mm/hugetlb_fault_after_madv.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/mm/hugetlb_fault_after_madv.c b/tools/testing/selftests/mm/hugetlb_fault_after_madv.c index 73b81c632366..ff3ba675278d 100644 --- a/tools/testing/selftests/mm/hugetlb_fault_after_madv.c +++ b/tools/testing/selftests/mm/hugetlb_fault_after_madv.c @@ -9,10 +9,10 @@ #include "vm_util.h" #include "../kselftest.h" -#define MMAP_SIZE (1 << 21) #define INLOOP_ITER 100 -char *huge_ptr; +static char *huge_ptr; +static size_t huge_page_size; /* Touch the memory while it is being madvised() */ void *touch(void *unused) @@ -30,7 +30,7 @@ void *madv(void *unused) usleep(rand() % 10); for (int i = 0; i < INLOOP_ITER; i++) - madvise(huge_ptr, MMAP_SIZE, MADV_DONTNEED); + madvise(huge_ptr, huge_page_size, MADV_DONTNEED); return NULL; } @@ -47,6 +47,10 @@ int main(void) srand(getpid()); + huge_page_size = default_huge_page_size(); + if (!huge_page_size) + ksft_exit_skip("Could not detect default hugetlb page size."); + free_hugepages = get_free_hugepages(); if (free_hugepages != 1) { ksft_exit_skip("This test needs one and only one page to execute. Got %lu\n", @@ -54,7 +58,7 @@ int main(void) } while (max--) { - huge_ptr = mmap(NULL, MMAP_SIZE, PROT_READ | PROT_WRITE, + huge_ptr = mmap(NULL, huge_page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, -1, 0); @@ -66,7 +70,7 @@ int main(void) pthread_join(thread1, NULL); pthread_join(thread2, NULL); - munmap(huge_ptr, MMAP_SIZE); + munmap(huge_ptr, huge_page_size); } return KSFT_PASS;