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 D7A41C77B73 for ; Thu, 20 Apr 2023 07:56:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234172AbjDTH4N (ORCPT ); Thu, 20 Apr 2023 03:56:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234191AbjDTH4L (ORCPT ); Thu, 20 Apr 2023 03:56:11 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0EFD49F for ; Thu, 20 Apr 2023 00:55:43 -0700 (PDT) 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 BB62B219DB; Thu, 20 Apr 2023 07:55:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1681977341; 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=1SC0XXh8aaIBVsT5La85YQEUgHVR6YINUs0uzF8+7gE=; b=FTkjr+r4F5kCZcHxv+uUdshNK5PVu179W3/fCSSHyoCpXjpH1bJEM/Y5v1T+zh3KMVYHbH mTMabm+TUvZ5ny+vuH7uGro+T9xkBe9B4wzQ78fW+DMCWuBLqKAfatQbh4YJ+vlbrPYyqy foGZE9O2o+hxdGIFWhrbzo/eEJ3530k= 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 99FD413584; Thu, 20 Apr 2023 07:55:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id Wuh4I/3vQGRGXAAAMHmgww (envelope-from ); Thu, 20 Apr 2023 07:55:41 +0000 Date: Thu, 20 Apr 2023 09:55:40 +0200 From: Michal Hocko To: Andrew Theurer Cc: Marcelo Tosatti , Andrew Morton , Christoph Lameter , Aaron Tomlin , Frederic Weisbecker , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Russell King , Huacai Chen , Heiko Carstens , x86@kernel.org, Vlastimil Babka Subject: Re: [PATCH v7 00/13] fold per-CPU vmstats remotely Message-ID: References: <20230320180332.102837832@redhat.com> <20230418150200.027528c155853fea8e4f58b2@linux-foundation.org> <98E08059-6607-43FF-84E3-BFF3FF193D09@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <98E08059-6607-43FF-84E3-BFF3FF193D09@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 19-04-23 08:44:23, Andrew Theurer wrote: > > On Apr 19, 2023, at 6:15 AM, Marcelo Tosatti wrote: > >> Andrew Theurer, can you please explain what problem is the vmstat_work > >> interruption causing in your testing? > > > > +CC Andrew. > > Nearly every telco we work with for 5G RAN is demanding <20 usec CPU > latency as measured by cyclictest & oslat. We cannot achieve under 20 > usec with the vmstats interruption. Are you able to get those latency requirements with PREEMPT_RT? -- Michal Hocko SUSE Labs