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 X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 018EDC433F5 for ; Thu, 23 Sep 2021 13:10:35 +0000 (UTC) Received: from picard.linux.it (picard.linux.it [213.254.12.146]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4A8D26103D for ; Thu, 23 Sep 2021 13:10:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 4A8D26103D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux.it Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id 158343CA1CF for ; Thu, 23 Sep 2021 15:10:33 +0200 (CEST) Received: from in-3.smtp.seeweb.it (in-3.smtp.seeweb.it [IPv6:2001:4b78:1:20::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 59ACD3C79C0 for ; Thu, 23 Sep 2021 15:10:23 +0200 (CEST) Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) (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 in-3.smtp.seeweb.it (Postfix) with ESMTPS id DE9941A0043C for ; Thu, 23 Sep 2021 15:10:22 +0200 (CEST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 591511FFB0; Thu, 23 Sep 2021 13:10:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1632402622; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=W354F09ONwgX75K2dvTIcwQk0FN5LIkn8BFzLSh6MfQ=; b=KJZt5/bvOZx9r6zY+aIfRtwgz28imya9wUjE820w//za1WM3rYpu75hKX571x7nH7RrjC1 BVKgfs9wX1TZwUsMHofqzzaxkYbh1eAQsNRtSMcHjV+qH3qv8gEh/XVGiF9/N1nDwWzCkC JjQ5ok8/DK7azsXeUpfOmFbG8UettPI= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1632402622; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=W354F09ONwgX75K2dvTIcwQk0FN5LIkn8BFzLSh6MfQ=; b=13SqDIcgVH5/G/F3Ob3jDsiB3nFN5riyqr99sNM+6V1i9vkn+HVumMdaFX5wu/IKak1w/D csuc2KQ+csCyxCDw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 4557A13DD5; Thu, 23 Sep 2021 13:10:22 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id ruXiD758TGHsQAAAMHmgww (envelope-from ); Thu, 23 Sep 2021 13:10:22 +0000 Date: Thu, 23 Sep 2021 15:10:53 +0200 From: Cyril Hrubis To: Li Wang Message-ID: References: <20210817104625.2559362-1-liwang@redhat.com> <20210921203349.GA2014441@maple.netwinder.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Virus-Scanned: clamav-milter 0.102.4 at in-3.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [RFC PATCH] fallocate05: increase the fallocate and defallocate size X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: LTP List Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi! > > I do not think that it's a good idea to pass ~100MB buffer to a single > > write() > > and expect it to succeed anyways. > > > > I suddenly realized that it is 1MB buffer but not 100MB, so that block > number > is not the key point for OOM. > > 1 Block == 4k on x86_64, > 256 * 4k == 1024kB == 1MB Uff my bad. Indeed the problem is the tmpfs that have been added to the list of filesystems to test recently. -- Cyril Hrubis chrubis@suse.cz -- Mailing list info: https://lists.linux.it/listinfo/ltp