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=-0.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,T_DKIM_INVALID autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by aws-us-west-2-korg-lkml-1.web.codeaurora.org (Postfix) with ESMTP id 270CBC07D22 for ; Mon, 11 Jun 2018 17:11:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 16A4F208B8 for ; Mon, 11 Jun 2018 16:49:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="uU5dPS1I" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16A4F208B8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org 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 S933866AbeFKQtD (ORCPT ); Mon, 11 Jun 2018 12:49:03 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:40144 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933806AbeFKQtB (ORCPT ); Mon, 11 Jun 2018 12:49:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=7kKDm54KD/HKt7qzH4v1ERV3Sljr4RD3bPuNaw5g7Is=; b=uU5dPS1IPO53IdR8WGVoknLbF W528fzEC9/f3KplybDQu8QDKtZn6UeBxugygp32IvnjVjDVuEZ3Bl25VdL33hdI1G7F2bidtc7M+U 1ZGo56CS0ExASalIE6ERptBaix1MuVVucp7CfkgPqYQQC0ARWzEws/i/henY7pfYN650iosDhgueq fOBCFtZhN8+yLgJ3oIt18PlN+0ycztV2QZaqFV4DCOkbulIyBcrkDs0bzVpoz9g66jPftQi8N4AAK i2CQkFZ6nkVMahY7RLzQfQ9+FTKK1Li522V1XTp8rSTpCErhKuz2siVu/o1JlO+nBi7p3jxIfzryA DpRQX4DBw==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1fSQ04-0006Zb-1S; Mon, 11 Jun 2018 16:49:00 +0000 Date: Mon, 11 Jun 2018 09:48:59 -0700 From: Matthew Wilcox To: Christoph Hellwig Cc: Al Viro , Linus Torvalds , Linux Kernel Mailing List , linux-fsdevel , Stephane Eranian Subject: Re: perfmon trouble Message-ID: <20180611164859.GA28292@bombadil.infradead.org> References: <20180608184842.GD30522@ZenIV.linux.org.uk> <20180609051051.GF30522@ZenIV.linux.org.uk> <20180609155107.GH30522@ZenIV.linux.org.uk> <20180611021028.GT30522@ZenIV.linux.org.uk> <20180611162313.GA6942@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180611162313.GA6942@infradead.org> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 11, 2018 at 09:23:13AM -0700, Christoph Hellwig wrote: > Is perfmon even in still in use? If not it might be a good idea to > drop it for good. The problem is that even oprofile on ia64 depends on perfmon. We have about four options, none of which are terribly appealing: 1. rm -rf arch/ia64. Bit harsh to do this when hardware is still being produced. 2. rm -rf arch/ia64's support for profiling completely. Would anybody complain? 3. Convert ia64 over to perf interface. Who would do this work? 4. Fix the perfmon kernel and userspace to not assume this insane semantic. Flag day, blah, blah. Gentoo and Debian seem to be the only remaining living ports to Itanium and at least the Debian one is very unofficial.