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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03793C433FE for ; Thu, 24 Nov 2022 01:16:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 68C236B0071; Wed, 23 Nov 2022 20:16:24 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 63CB46B0072; Wed, 23 Nov 2022 20:16:24 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 52A686B0074; Wed, 23 Nov 2022 20:16:24 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 40ACA6B0071 for ; Wed, 23 Nov 2022 20:16:24 -0500 (EST) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id DADC7412A5 for ; Thu, 24 Nov 2022 01:16:23 +0000 (UTC) X-FDA: 80166570246.18.E5A26B3 Received: from out2.migadu.com (out2.migadu.com [188.165.223.204]) by imf19.hostedemail.com (Postfix) with ESMTP id 52CB81A000B for ; Thu, 24 Nov 2022 01:16:23 +0000 (UTC) Date: Wed, 23 Nov 2022 17:16:17 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1669252582; h=from:from:reply-to:subject:subject: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=X10ndcuj6qHWzQmi4w31+6lj2UzJf4XjRKHTMNK22xA=; b=e0Q3wb/H+DLIDd0sI4f0wcZ9ndVg9eOU4za2VvlRXG1glYig38lDN8jYW9chPpHFfsYm/Q LgRQJORtMKohoWvwd+/13AI8ddbb7/bQBGZoY7kzeXMdywfPYrubPq9VeyAsIMhRw9eNWq H+Z8YvM+em1ArcUWSfnyzQntsE+CRdk= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Roman Gushchin To: Vlastimil Babka Cc: Christoph Lameter , David Rientjes , Joonsoo Kim , Pekka Enberg , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Andrew Morton , Linus Torvalds , Matthew Wilcox , patches@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 05/12] mm, slub: lower the default slub_max_order with CONFIG_SLUB_TINY Message-ID: References: <20221121171202.22080-1-vbabka@suse.cz> <20221121171202.22080-6-vbabka@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221121171202.22080-6-vbabka@suse.cz> X-Migadu-Flow: FLOW_OUT ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669252583; a=rsa-sha256; cv=none; b=LRMIeLP64RswH3mIDY3a8ljNHNgpaN05PonYT/5HI1PSfVc343lEvxxk0usvpmoSSNqns2 pdDhos9QZm45bkAq0Q5VrBMbhGeq+JKJ4jnUhG8sza26OzLX6gooW1hh/6uCZLnsTrBMrk alqnLGbhY7fUZ9KdV2QLYA0FnvxwkQo= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="e0Q3wb/H"; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf19.hostedemail.com: domain of roman.gushchin@linux.dev designates 188.165.223.204 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669252583; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=X10ndcuj6qHWzQmi4w31+6lj2UzJf4XjRKHTMNK22xA=; b=mzVXW8zhKQzb/PWPMkg3a7vi7mIAGIY94tQiDCqIKrnCCusUBOqfkuQYGrMrHYT1tFGiis fZER/0cuEgKYFhgi3S0hOlUGzA5JVr85RZOfsEhGBxuS88HmmuPT7o2DylJf4OvvvdMrd+ roxDbcyv/OzBooIu2wvT9uejmNLkd78= X-Stat-Signature: mpt9kjswjs153na54nshotwxdqcwpu96 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 52CB81A000B Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="e0Q3wb/H"; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf19.hostedemail.com: domain of roman.gushchin@linux.dev designates 188.165.223.204 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev X-Rspam-User: X-HE-Tag: 1669252583-65178 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Nov 21, 2022 at 06:11:55PM +0100, Vlastimil Babka wrote: > With CONFIG_SLUB_TINY we want to minimize memory overhead. By lowering > the default slub_max_order we can make slab allocations use smaller > pages. However depending on object sizes, order-0 might not be the best > due to increased fragmentation. When testing on a 8MB RAM k210 system by > Damien Le Moal [1], slub_max_order=1 had the best results, so use that > as the default for CONFIG_SLUB_TINY. > > [1] https://lore.kernel.org/all/6a1883c4-4c3f-545a-90e8-2cd805bcf4ae@opensource.wdc.com/ > > Signed-off-by: Vlastimil Babka Acked-by: Roman Gushchin Thanks!