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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 E6D4FC432C1 for ; Mon, 23 Sep 2019 21:24:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C2A2421E6F for ; Mon, 23 Sep 2019 21:24:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2503034AbfIWVYJ (ORCPT ); Mon, 23 Sep 2019 17:24:09 -0400 Received: from out03.mta.xmission.com ([166.70.13.233]:34567 "EHLO out03.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388395AbfIWVYJ (ORCPT ); Mon, 23 Sep 2019 17:24:09 -0400 Received: from in02.mta.xmission.com ([166.70.13.52]) by out03.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.87) (envelope-from ) id 1iCVoW-0001PW-Bn; Mon, 23 Sep 2019 15:24:08 -0600 Received: from ip68-227-160-95.om.om.cox.net ([68.227.160.95] helo=x220.xmission.com) by in02.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.87) (envelope-from ) id 1iCVoV-0001wk-Qg; Mon, 23 Sep 2019 15:24:08 -0600 From: ebiederm@xmission.com (Eric W. Biederman) To: Michal Hocko Cc: Andrew Morton , Heinrich Schuchardt , LKML References: <20190917100350.GB1872@dhcp22.suse.cz> <38349607-b09c-fa61-ccbb-20bee9f282a3@gmx.de> <20190917153830.GE1872@dhcp22.suse.cz> <87ftku96md.fsf@x220.int.ebiederm.org> <20190918071541.GB12770@dhcp22.suse.cz> <87h8585bej.fsf@x220.int.ebiederm.org> <20190922065801.GB18814@dhcp22.suse.cz> <875zlk3tz9.fsf@x220.int.ebiederm.org> <20190923080808.GA6016@dhcp22.suse.cz> Date: Mon, 23 Sep 2019 16:23:40 -0500 In-Reply-To: <20190923080808.GA6016@dhcp22.suse.cz> (Michal Hocko's message of "Mon, 23 Sep 2019 10:08:08 +0200") Message-ID: <87mueuu2oz.fsf@x220.int.ebiederm.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1iCVoV-0001wk-Qg;;;mid=<87mueuu2oz.fsf@x220.int.ebiederm.org>;;;hst=in02.mta.xmission.com;;;ip=68.227.160.95;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1+hxpSDtOo3FHzcbUiojMZiFj7TaPT97BQ= X-SA-Exim-Connect-IP: 68.227.160.95 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: Re: threads-max observe limits X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Michal, Thinking about this I have a hunch about what changed. I think at some point we changed from 4k to 8k kernel stacks. So I suspect if your client is seeing a lower threads-max it is because the size of the kernel data structures increased. Eric