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=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 EE52BECDE32 for ; Wed, 17 Oct 2018 15:38:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B17B62150F for ; Wed, 17 Oct 2018 15:38:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b="K3MxQ+T9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B17B62150F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727665AbeJQXee (ORCPT ); Wed, 17 Oct 2018 19:34:34 -0400 Received: from a9-112.smtp-out.amazonses.com ([54.240.9.112]:40964 "EHLO a9-112.smtp-out.amazonses.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727048AbeJQXee (ORCPT ); Wed, 17 Oct 2018 19:34:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=ug7nbtf4gccmlpwj322ax3p6ow6yfsug; d=amazonses.com; t=1539790699; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:MIME-Version:Content-Type:Feedback-ID; bh=kFeDuZF+WukdfWtOGS/vzeuUzjLlBoNKTmu0Zujw1SQ=; b=K3MxQ+T9o2WtwioM86fWIgB1JfMmDhoLHnm9tL7okDN1s847t2jyhVRtBKXa1phG /Ya9M5kk4MaTmJm9sFL/Jr3bnGfF6PyIdsIPZrCzsTxWfnBSX6ugeeTpj/cAwsksklD LGKRRf3A2UlvY//msD03hbnzlbzWYSJQ3eOc3OA8= Date: Wed, 17 Oct 2018 15:38:19 +0000 From: Christopher Lameter X-X-Sender: cl@nuc-kabylake To: Vlastimil Babka cc: David Rientjes , Andrew Morton , Pekka Enberg , Joonsoo Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [patch] mm, slab: avoid high-order slab pages when it does not reduce waste In-Reply-To: <8eaaa366-415a-5d72-7720-82468d853efd@suse.cz> Message-ID: <0100016682ad79b9-b1dafb6b-98e2-4d43-835d-fded2028840d-000000@email.amazonses.com> References: <20181012151341.286cd91321cdda9b6bde4de9@linux-foundation.org> <0100016679e3c96f-c78df4e2-9ab8-48db-8796-271c4b439f16-000000@email.amazonses.com> <010001667d7476a2-f91dcf12-5e90-4ade-97e8-9fd651f7bf17-000000@email.amazonses.com> <8eaaa366-415a-5d72-7720-82468d853efd@suse.cz> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-SES-Outgoing: 2018.10.17-54.240.9.112 Feedback-ID: 1.us-east-1.fQZZZ0Xtj2+TD7V5apTT/NrT6QKuPgzCT/IC7XYgDKI=:AmazonSES Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 17 Oct 2018, Vlastimil Babka wrote: > I.e. the benefits vs drawbacks of higher order allocations for SLAB are > out of scope here. It would be nice if somebody evaluated them, but the > potential resulting change would be much larger than what concerns this > patch. But it would arguably also make SLAB more like SLUB, which you > already questioned at some point... Well if this leads to more code going into mm/slab_common.c then I would certainly welcome that.