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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 02D56C34050 for ; Wed, 19 Feb 2020 08:45:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA8C121D56 for ; Wed, 19 Feb 2020 08:45:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="Z05PqepO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726604AbgBSIps (ORCPT ); Wed, 19 Feb 2020 03:45:48 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:29343 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726265AbgBSIps (ORCPT ); Wed, 19 Feb 2020 03:45:48 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 48MrsP1rpLz9v6b8; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=Z05PqepO; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id keiKTMYSteB4; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 48MrsN71T3z9v6b7; Wed, 19 Feb 2020 09:45:44 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1582101945; bh=5A070PBG/NLKWQpTrZybAuA+otVPzj/KnbWKO2e8w8o=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=Z05PqepONeujNziQ5YL8gnf1Z3+G6cb6ihOxmxz8uWdJtZ5jvdl2W5nDGv6hQ627P yeH79Ly2Y6BDHEAClz4F0Sl7Ug7F7nBhocpqGaYZNQCnKXBAU1M4joGRYAVfpvCCT5 7XWc5FDRGFtiGRD1v2TVtmoHayh/6+4PxTcYWAOs= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 055918B829; Wed, 19 Feb 2020 09:45:46 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 39Yl18DznLEK; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Received: from [172.25.230.102] (unknown [172.25.230.102]) by messagerie.si.c-s.fr (Postfix) with ESMTP id BA9888B756; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Subject: Re: Surprising code generated for vdso_read_begin() To: Arnd Bergmann , Segher Boessenkool Cc: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Thomas Gleixner , Vincenzo Frascino , Andy Lutomirski , the arch/x86 maintainers , linuxppc-dev , "linux-kernel@vger.kernel.org" , Linux ARM , "open list:BROADCOM NVRAM DRIVER" References: <20200109200733.GS3191@gate.crashing.org> <77a8bf25-6615-6c0a-56d4-eae7aa8a8f09@c-s.fr> <20200111113328.GX3191@gate.crashing.org> From: Christophe Leroy Message-ID: <305fcee5-2e1b-ea4d-9a2a-a0e8034d40a8@c-s.fr> Date: Wed, 19 Feb 2020 09:45:45 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 16/02/2020 à 19:10, Arnd Bergmann a écrit : > On Sat, Jan 11, 2020 at 12:33 PM Segher Boessenkool > wrote: >> >> On Fri, Jan 10, 2020 at 07:45:44AM +0100, Christophe Leroy wrote: >>> Le 09/01/2020 à 21:07, Segher Boessenkool a écrit : >>>> It looks like the compiler did loop peeling. What GCC version is this? >>>> Please try current trunk (to become GCC 10), or at least GCC 9? >>> >>> It is with GCC 5.5 >>> >>> https://mirrors.edge.kernel.org/pub/tools/crosstool/ doesn't have more >>> recent than 8.1 >> >> Arnd, can you update the tools? We are at 8.3 and 9.2 now :-) Or is >> this hard and/or painful to do? > > To follow up on this older thread, I have now uploaded 6.5, 7.5, 8.3 and 9.2 > binaries, as well as a recent 10.0 snapshot. > Thanks Arnd, I have built the VDSO with 9.2, I get less performant result than with 8.2 (same performance as with 5.5). After a quick look, I see: - Irrelevant NOPs to align loops and stuff, allthough -mpcu=860 should avoid that. - A stack frame is set for saving r31 in __c_kernel_clock_gettime. GCC 8.1 don't need that, all VDSO functions are frameless with 8.1 Christophe 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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 009C4C34022 for ; Wed, 19 Feb 2020 08:47:35 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5C815208E4 for ; Wed, 19 Feb 2020 08:47:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="Z05PqepO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5C815208E4 Authentication-Results: mail.kernel.org; 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Wed, 19 Feb 2020 09:45:46 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 39Yl18DznLEK; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Received: from [172.25.230.102] (unknown [172.25.230.102]) by messagerie.si.c-s.fr (Postfix) with ESMTP id BA9888B756; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Subject: Re: Surprising code generated for vdso_read_begin() To: Arnd Bergmann , Segher Boessenkool References: <20200109200733.GS3191@gate.crashing.org> <77a8bf25-6615-6c0a-56d4-eae7aa8a8f09@c-s.fr> <20200111113328.GX3191@gate.crashing.org> From: Christophe Leroy Message-ID: <305fcee5-2e1b-ea4d-9a2a-a0e8034d40a8@c-s.fr> Date: Wed, 19 Feb 2020 09:45:45 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: the arch/x86 maintainers , "linux-kernel@vger.kernel.org" , "open list:BROADCOM NVRAM DRIVER" , Paul Mackerras , Andy Lutomirski , Thomas Gleixner , Vincenzo Frascino , linuxppc-dev , Linux ARM Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Le 16/02/2020 à 19:10, Arnd Bergmann a écrit : > On Sat, Jan 11, 2020 at 12:33 PM Segher Boessenkool > wrote: >> >> On Fri, Jan 10, 2020 at 07:45:44AM +0100, Christophe Leroy wrote: >>> Le 09/01/2020 à 21:07, Segher Boessenkool a écrit : >>>> It looks like the compiler did loop peeling. What GCC version is this? >>>> Please try current trunk (to become GCC 10), or at least GCC 9? >>> >>> It is with GCC 5.5 >>> >>> https://mirrors.edge.kernel.org/pub/tools/crosstool/ doesn't have more >>> recent than 8.1 >> >> Arnd, can you update the tools? We are at 8.3 and 9.2 now :-) Or is >> this hard and/or painful to do? > > To follow up on this older thread, I have now uploaded 6.5, 7.5, 8.3 and 9.2 > binaries, as well as a recent 10.0 snapshot. > Thanks Arnd, I have built the VDSO with 9.2, I get less performant result than with 8.2 (same performance as with 5.5). After a quick look, I see: - Irrelevant NOPs to align loops and stuff, allthough -mpcu=860 should avoid that. - A stack frame is set for saving r31 in __c_kernel_clock_gettime. GCC 8.1 don't need that, all VDSO functions are frameless with 8.1 Christophe 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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 BBFBEC34022 for ; Wed, 19 Feb 2020 08:46:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7F858208E4 for ; Wed, 19 Feb 2020 08:46:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="kKMU/8Mg"; 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Wed, 19 Feb 2020 09:45:44 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1582101945; bh=5A070PBG/NLKWQpTrZybAuA+otVPzj/KnbWKO2e8w8o=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=Z05PqepONeujNziQ5YL8gnf1Z3+G6cb6ihOxmxz8uWdJtZ5jvdl2W5nDGv6hQ627P yeH79Ly2Y6BDHEAClz4F0Sl7Ug7F7nBhocpqGaYZNQCnKXBAU1M4joGRYAVfpvCCT5 7XWc5FDRGFtiGRD1v2TVtmoHayh/6+4PxTcYWAOs= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 055918B829; Wed, 19 Feb 2020 09:45:46 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 39Yl18DznLEK; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Received: from [172.25.230.102] (unknown [172.25.230.102]) by messagerie.si.c-s.fr (Postfix) with ESMTP id BA9888B756; Wed, 19 Feb 2020 09:45:45 +0100 (CET) Subject: Re: Surprising code generated for vdso_read_begin() To: Arnd Bergmann , Segher Boessenkool References: <20200109200733.GS3191@gate.crashing.org> <77a8bf25-6615-6c0a-56d4-eae7aa8a8f09@c-s.fr> <20200111113328.GX3191@gate.crashing.org> From: Christophe Leroy Message-ID: <305fcee5-2e1b-ea4d-9a2a-a0e8034d40a8@c-s.fr> Date: Wed, 19 Feb 2020 09:45:45 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Language: fr X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200219_004552_553555_989E6B58 X-CRM114-Status: GOOD ( 12.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Benjamin Herrenschmidt , the arch/x86 maintainers , "linux-kernel@vger.kernel.org" , "open list:BROADCOM NVRAM DRIVER" , Paul Mackerras , Andy Lutomirski , Michael Ellerman , Thomas Gleixner , Vincenzo Frascino , linuxppc-dev , Linux ARM Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org CgpMZSAxNi8wMi8yMDIwIMOgIDE5OjEwLCBBcm5kIEJlcmdtYW5uIGEgw6ljcml0wqA6Cj4gT24g U2F0LCBKYW4gMTEsIDIwMjAgYXQgMTI6MzMgUE0gU2VnaGVyIEJvZXNzZW5rb29sCj4gPHNlZ2hl ckBrZXJuZWwuY3Jhc2hpbmcub3JnPiB3cm90ZToKPj4KPj4gT24gRnJpLCBKYW4gMTAsIDIwMjAg YXQgMDc6NDU6NDRBTSArMDEwMCwgQ2hyaXN0b3BoZSBMZXJveSB3cm90ZToKPj4+IExlIDA5LzAx LzIwMjAgw6AgMjE6MDcsIFNlZ2hlciBCb2Vzc2Vua29vbCBhIMOpY3JpdCA6Cj4+Pj4gSXQgbG9v a3MgbGlrZSB0aGUgY29tcGlsZXIgZGlkIGxvb3AgcGVlbGluZy4gIFdoYXQgR0NDIHZlcnNpb24g aXMgdGhpcz8KPj4+PiBQbGVhc2UgdHJ5IGN1cnJlbnQgdHJ1bmsgKHRvIGJlY29tZSBHQ0MgMTAp LCBvciBhdCBsZWFzdCBHQ0MgOT8KPj4+Cj4+PiBJdCBpcyB3aXRoIEdDQyA1LjUKPj4+Cj4+PiBo dHRwczovL21pcnJvcnMuZWRnZS5rZXJuZWwub3JnL3B1Yi90b29scy9jcm9zc3Rvb2wvIGRvZXNu J3QgaGF2ZSBtb3JlCj4+PiByZWNlbnQgdGhhbiA4LjEKPj4KPj4gQXJuZCwgY2FuIHlvdSB1cGRh dGUgdGhlIHRvb2xzPyAgV2UgYXJlIGF0IDguMyBhbmQgOS4yIG5vdyA6LSkgIE9yIGlzCj4+IHRo aXMgaGFyZCBhbmQvb3IgcGFpbmZ1bCB0byBkbz8KPiAKPiBUbyBmb2xsb3cgdXAgb24gdGhpcyBv bGRlciB0aHJlYWQsIEkgaGF2ZSBub3cgdXBsb2FkZWQgNi41LCA3LjUsIDguMyBhbmQgOS4yCj4g YmluYXJpZXMsIGFzIHdlbGwgYXMgYSByZWNlbnQgMTAuMCBzbmFwc2hvdC4KPiAKClRoYW5rcyBB cm5kLAoKSSBoYXZlIGJ1aWx0IHRoZSBWRFNPIHdpdGggOS4yLCBJIGdldCBsZXNzIHBlcmZvcm1h bnQgcmVzdWx0IHRoYW4gd2l0aCAKOC4yIChzYW1lIHBlcmZvcm1hbmNlIGFzIHdpdGggNS41KS4K CkFmdGVyIGEgcXVpY2sgbG9vaywgSSBzZWU6Ci0gSXJyZWxldmFudCBOT1BzIHRvIGFsaWduIGxv b3BzIGFuZCBzdHVmZiwgYWxsdGhvdWdoIC1tcGN1PTg2MCBzaG91bGQgCmF2b2lkIHRoYXQuCi0g QSBzdGFjayBmcmFtZSBpcyBzZXQgZm9yIHNhdmluZyByMzEgaW4gX19jX2tlcm5lbF9jbG9ja19n ZXR0aW1lLiBHQ0MgCjguMSBkb24ndCBuZWVkIHRoYXQsIGFsbCBWRFNPIGZ1bmN0aW9ucyBhcmUg ZnJhbWVsZXNzIHdpdGggOC4xCgpDaHJpc3RvcGhlCgpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51 eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5v cmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==