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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 1BDEAC636CC for ; Tue, 7 Feb 2023 13:42:41 +0000 (UTC) Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id 966623CC214 for ; Tue, 7 Feb 2023 14:42:38 +0100 (CET) Received: from in-5.smtp.seeweb.it (in-5.smtp.seeweb.it [217.194.8.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 83F313CB15E for ; Tue, 7 Feb 2023 14:42:25 +0100 (CET) Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) (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-5.smtp.seeweb.it (Postfix) with ESMTPS id 892A2600920 for ; Tue, 7 Feb 2023 14:42:24 +0100 (CET) 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-out1.suse.de (Postfix) with ESMTPS id A63CC38AEE; Tue, 7 Feb 2023 13:42:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1675777344; h=from:from:reply-to: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=EM0jkCctv6KMMVgX+scDTVfCZ1zmWVIRE/W4/0qfZIM=; b=FLMqSkNGMTrqdgO6VKXxxjWVFpanBVg/QmT6Lmr8hehCvAIq/LVm8BBagc8QjclXpJnk2Q 0OI2sHs2vaK2sD1EgGxwJZtkXrXcJflcHJJErR32eq92OUIj31XSTNDanYGtRbANRJF3wi InpgY8Of9/1PS5y1sBtYU3aeoudNAko= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1675777344; h=from:from:reply-to: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=EM0jkCctv6KMMVgX+scDTVfCZ1zmWVIRE/W4/0qfZIM=; b=z99c9qEvtA8wGCoyBbOcozPws25wIYib4Ixv8FNaEYlGniLUMMSjUKAJfH+TmokBebRtS8 u8qraEbJ32JumIDA== 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 69400139ED; Tue, 7 Feb 2023 13:42:24 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id Q+nzFUBV4mN/eAAAMHmgww (envelope-from ); Tue, 07 Feb 2023 13:42:24 +0000 Date: Tue, 7 Feb 2023 14:42:22 +0100 From: Petr Vorel To: Leo Yu-Chi Liang Message-ID: References: <20230207124008.1788759-1-ycliang@andestech.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230207124008.1788759-1-ycliang@andestech.com> X-Virus-Scanned: clamav-milter 0.102.4 at in-5.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH 1/1] tst_pids.c: fix fork failure on small memory systems 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: , Reply-To: Petr Vorel Cc: ltp@lists.linux.it 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 Leo, > Running syscalls/msgstress03 on a system with less than ~1 GB of RAM fails: > msgstress03 1 TFAIL : msgstress03.c:163: Fork failed (may be OK if under stress) > The reason is that besides /proc/sys/kernel/pid_max, /proc/sys/kernel/threads-max > is another factor determining how many processes a system could create. > Use the smaller number between pid_max and threads-max as the nprocs. Makes sense. Reviewed-by: Petr Vorel BTW IMHO it'd be better to rewrite f = popen("ps -eT | wc -l", "r"); to list count of /proc/[0-9]*/ in plain C (TODO for us). Kind regards, Petr -- Mailing list info: https://lists.linux.it/listinfo/ltp