From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CEA1C433EF for ; Fri, 5 Nov 2021 20:43:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 75D3161362 for ; Fri, 5 Nov 2021 20:43:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232810AbhKEUqT (ORCPT ); Fri, 5 Nov 2021 16:46:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:41252 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233648AbhKEUqT (ORCPT ); Fri, 5 Nov 2021 16:46:19 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C10D061357; Fri, 5 Nov 2021 20:43:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1636145019; bh=A1b8T3O1T0WocifxUVe3XDB6mxulsM/WPJ8ZXiLYRy4=; h=Date:From:To:Subject:In-Reply-To:From; b=u3faRA7HpsYo4pkZtNx87bc/4o+AqbWN73KVDdAIiVS6eVjJqnAN8cNKfwRz2Jd/u DSZoRnJjoTvgrTfc1eFw15gVqYWB2k08X9WJlgjI2+IXsosUJF9WfPTSvURQbGXIVK zeu37hWkUUD+cHQGDgjGOR4f/vyQRpQrAp5vtAyY= Date: Fri, 05 Nov 2021 13:43:38 -0700 From: Andrew Morton To: akpm@linux-foundation.org, davis.george@siemens.com, erosca@de.adit-jv.com, koct9i@gmail.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, skhan@linuxfoundation.org, torvalds@linux-foundation.org Subject: [patch 172/262] selftests/vm/transhuge-stress: fix ram size thinko Message-ID: <20211105204338.945CWO140%akpm@linux-foundation.org> In-Reply-To: <20211105133408.cccbb98b71a77d5e8430aba1@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: "George G. Davis" Subject: selftests/vm/transhuge-stress: fix ram size thinko When executing transhuge-stress with an argument to specify the virtual memory size for testing, the ram size is reported as 0, e.g. transhuge-stress 384 thp-mmap: allocate 192 transhuge pages, using 384 MiB virtual memory and 0 MiB of ram thp-mmap: 0.184 s/loop, 0.957 ms/page, 2090.265 MiB/s 192 succeed, 0 failed This appears to be due to a thinko in commit 0085d61fe05e ("selftests/vm/transhuge-stress: stress test for memory compaction"), where, at a guess, the intent was to base "xyz MiB of ram" on `ram` size. Here are results after using `ram` size: thp-mmap: allocate 192 transhuge pages, using 384 MiB virtual memory and 14 MiB of ram Link: https://lkml.kernel.org/r/20210825135843.29052-1-george_davis@mentor.com Fixes: 0085d61fe05e ("selftests/vm/transhuge-stress: stress test for memory compaction") Signed-off-by: George G. Davis Cc: Konstantin Khlebnikov Cc: Eugeniu Rosca Cc: Shuah Khan Signed-off-by: Andrew Morton --- tools/testing/selftests/vm/transhuge-stress.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/tools/testing/selftests/vm/transhuge-stress.c~selftests-vm-transhuge-stress-fix-ram-size-thinko +++ a/tools/testing/selftests/vm/transhuge-stress.c @@ -79,7 +79,7 @@ int main(int argc, char **argv) warnx("allocate %zd transhuge pages, using %zd MiB virtual memory" " and %zd MiB of ram", len >> HPAGE_SHIFT, len >> 20, - len >> (20 + HPAGE_SHIFT - PAGE_SHIFT - 1)); + ram >> (20 + HPAGE_SHIFT - PAGE_SHIFT - 1)); pagemap_fd = open("/proc/self/pagemap", O_RDONLY); if (pagemap_fd < 0) _