Received: by 2002:ac0:a582:0:0:0:0:0 with SMTP id m2-v6csp809812imm; Wed, 17 Oct 2018 08:39:06 -0700 (PDT) X-Google-Smtp-Source: ACcGV63QmxckH9y3h9uRap+TWlloiMDNoGwYhWZmUbo6cs4j8fqiz21nDy3JhCsgK6FIarfjxLif X-Received: by 2002:a63:df03:: with SMTP id u3-v6mr6101803pgg.362.1539790746646; Wed, 17 Oct 2018 08:39:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1539790746; cv=none; d=google.com; s=arc-20160816; b=yGcsEVPkjfY7EycG02QlFV+iDyhi867aJI0SK2nCmJOVV3BrFumWdAA0/FuafJG3Kp 1peFPnZQiR8eyuBTx1hy6qqmMDmk0rGwpN2UI0+R+pCFWqvoFpdz7UmKh0lrBilZn/7m AMyym4RhO7vudd+08ye35MNegxcU1X0n+8W9CW8+GrD3tFDktyO9xXSKdntgfw8zfMVl OgACm39KyKnq7dIUfwFuQg6SfK/GyKv5KJrW3Yz740tj5jWHZMbBbGNV8Cuk7rbUJWW/ FFMekAl4bXBkDK318v+yAfkSIE5thA8w55dhYW/c1JwGEvTFM3136Wd9UfE5e/dgySuo 6JSg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:feedback-id:mime-version:user-agent :references:message-id:in-reply-to:subject:cc:to:from:date :dkim-signature; bh=kFeDuZF+WukdfWtOGS/vzeuUzjLlBoNKTmu0Zujw1SQ=; b=iNUjEJDZVLuAsu5pht9IlCypgZbTxMKF+9lXMmRAM/NYdD4BRj2ezZyeUfZE1rEmA8 xLRgxtdZRPoCjosPNkJ6o7RhzIEqdYmhfaYCx6uLqyC9UBks0lZVtpDYiALbJeYrKmHR PsMiphwY13qNKuOotGz3yBfUsOJA0T2kOYRqPIxJ/oc0F4VwQP0UNVyyWJv42romH1AR abfSVfom+wYHOpJv8IxYAu4cnGHruO7dTkRG6CXIN9MqBgHy7JKeRq5vuKl8LLQS4tju BpiX3msykM+5zVHcJ9auZ/2EaW/aL11VOGQKf2o60Xmmdb+vZfzlkkZbdsOp4ib0eQAh zUXg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazonses.com header.s=ug7nbtf4gccmlpwj322ax3p6ow6yfsug header.b=K3MxQ+T9; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b13-v6si17879060pgj.154.2018.10.17.08.38.50; Wed, 17 Oct 2018 08:39:06 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@amazonses.com header.s=ug7nbtf4gccmlpwj322ax3p6ow6yfsug header.b=K3MxQ+T9; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727635AbeJQXee (ORCPT + 99 others); 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.