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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D82ECC433EF for ; Mon, 25 Apr 2022 19:01:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244778AbiDYTEH (ORCPT ); Mon, 25 Apr 2022 15:04:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48518 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244772AbiDYTEE (ORCPT ); Mon, 25 Apr 2022 15:04:04 -0400 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 74D0B44740 for ; Mon, 25 Apr 2022 12:00:59 -0700 (PDT) Received: by mail-pj1-x104a.google.com with SMTP id m12-20020a17090a71cc00b001d692bcbae1so1484211pjs.5 for ; Mon, 25 Apr 2022 12:00:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=eqHPhXVFsY1aWd5kzuU1eL2wsGrZ6tPFgC+x7Ju6qxo=; b=PBg+H68ojw1koOQnEJrZ6MMtj1acWkPTyAwFIkSY0wqW+D0Ubjw5x2Ksetg2ivOCuZ 5+tPJvp8xXIWyTgLtC+OXULAzhoJB2tO+3NY5OZB2VK0H+IoAxoJ8VoDcAmflY6BOnuZ drcAFgQM1a/JXp2LFIgumdKBshtSyBa72bu7b+fT/jUHqCsFpJwyLx4jLvX1rBMK8Z4s SzNgZFO9Pt8mEDE9EBL/QcCwmtAnQ/dCvFYOcWA5AQ4H3e0AstKYC+NIlkg1m6J2jkIK +O74AyMLPo8rXFTpkOOt9jzBOKCtuVYM0QLUxRJQhzNOwiQgVR+/6fI4u/oBy+9Lpov5 1sZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=eqHPhXVFsY1aWd5kzuU1eL2wsGrZ6tPFgC+x7Ju6qxo=; b=AKOs3d3QZ+xlGLxFaxch3z3QLgE7i7pYNDSHr9oaKsROJRFOxM34dC7EA3vNuvAlaE cuiQJxlAUE776qHUJkmitvSuSzcIQGwq28JiLiVjKaaETaprD0Rn/YZWSleREnRjtyMI 7iHrPwSievxJ6ug3vgBkNF/DV5JRoucKiDduIE3tEYOFdtSKN9TfhWF/ChpF/JFnBvys 8q10BQkAxfsXXWWKjWeZYuYJha6MwNhO0hc/pl+AoDIPli48WPh80HDppW1g9AAuBTMT Srjpji9/fdD/5NKXoYT4GEx0fcUlFwgU0u+e7x9i4tF14j/2IQuwiaHg7XUph4IlRe6F TRtA== X-Gm-Message-State: AOAM531P6rUS5Xkb3df5OA5jk0xkjaFz/93WiWwWOjiuwuUaNFX1rccX CEo1eQA6AJjTGpAP5e8Y1ow38ibRNE/sxla6 X-Google-Smtp-Source: ABdhPJx21kD4fs+Pmg4O/2ap8I01dUttJqH2BxaSjv6wllmIYa+0VJzGMqxovlYs0K2IGdPVqKy9drNg7BmOd4FK X-Received: from yosry.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:2327]) (user=yosryahmed job=sendgmr) by 2002:a65:4c8e:0:b0:3aa:24bf:9e63 with SMTP id m14-20020a654c8e000000b003aa24bf9e63mr16510838pgt.592.1650913258801; Mon, 25 Apr 2022 12:00:58 -0700 (PDT) Date: Mon, 25 Apr 2022 19:00:39 +0000 In-Reply-To: <20220425190040.2475377-1-yosryahmed@google.com> Message-Id: <20220425190040.2475377-4-yosryahmed@google.com> Mime-Version: 1.0 References: <20220425190040.2475377-1-yosryahmed@google.com> X-Mailer: git-send-email 2.36.0.rc2.479.g8af0fa9b8e-goog Subject: [PATCH v5 3/4] selftests: cgroup: fix alloc_anon_noexit() instantly freeing memory From: Yosry Ahmed To: Johannes Weiner , Michal Hocko , Shakeel Butt , Andrew Morton , Roman Gushchin Cc: David Rientjes , Tejun Heo , Zefan Li , Jonathan Corbet , Shuah Khan , Yu Zhao , Dave Hansen , Wei Xu , Greg Thelen , Chen Wandun , Vaibhav Jain , "=?UTF-8?q?Michal=20Koutn=C3=BD?=" , Tim Chen , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Yosry Ahmed Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, alloc_anon_noexit() calls alloc_anon() which instantly frees the allocated memory. alloc_anon_noexit() is usually used with cg_run_nowait() to run a process in the background that allocates memory. It makes sense for the background process to keep the memory allocated and not instantly free it (otherwise there is no point of running it in the background). Signed-off-by: Yosry Ahmed Acked-by: Roman Gushchin Acked-by: Shakeel Butt --- tools/testing/selftests/cgroup/test_memcontrol.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c index 36ccf2322e21..f2ffb3a30194 100644 --- a/tools/testing/selftests/cgroup/test_memcontrol.c +++ b/tools/testing/selftests/cgroup/test_memcontrol.c @@ -211,13 +211,17 @@ static int alloc_pagecache_50M_noexit(const char *cgroup, void *arg) static int alloc_anon_noexit(const char *cgroup, void *arg) { int ppid = getppid(); + size_t size = (unsigned long)arg; + char *buf, *ptr; - if (alloc_anon(cgroup, arg)) - return -1; + buf = malloc(size); + for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + *ptr = 0; while (getppid() == ppid) sleep(1); + free(buf); return 0; } -- 2.36.0.rc2.479.g8af0fa9b8e-goog