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=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT 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 E8FE8ECDFBB for ; Fri, 20 Jul 2018 11:04:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A5721206B7 for ; Fri, 20 Jul 2018 11:04:39 +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="U2ZRKMx0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A5721206B7 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 S1729302AbeGTLwU (ORCPT ); Fri, 20 Jul 2018 07:52:20 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:41296 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727408AbeGTLwU (ORCPT ); Fri, 20 Jul 2018 07:52:20 -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=7ouedsEnVmJZXV8iKYA9Gm2tBgsZ9qzzF0EIfIEvWSw=; b=U2ZRKMx0MAJYDKjDby+eP7Dgo itPVm3SsKippAICD641iA+sIxjFZnJCmXnG4Velz97S/pYMJVA2mAiNPb+2/u2WhsUJlI2axNbQwI QTHWZo6mjn22KMnNy+r+4CYlUYGZO1bsC2SjVkKfxofPxUfW0s64RygtER4uLBNgE5xhVi5sQSoSD GtHRT0AH1laG59r87sLMuyCvy1itmp0T3X7ZZcpd+vYWqfVimvnew/APEXxnBP9Im5dgxA/VNr44j HbVJGcJ4DZJF+opsvb3HxVA90xCI5ByO1GEq0d5vC9YPZ2wMo2f/eIiGwvAae8XMfVdd2t6Q6XBMl 2Sca4LwEg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fgTD1-0006o3-4h; Fri, 20 Jul 2018 11:04:27 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id CDAC920275F3E; Fri, 20 Jul 2018 13:04:24 +0200 (CEST) Date: Fri, 20 Jul 2018 13:04:24 +0200 From: Peter Zijlstra To: Andy Lutomirski Cc: Rik van Riel , Vitaly Kuznetsov , Andy Lutomirski , LKML , X86 ML , Mike Galbraith , kernel-team , Ingo Molnar , Dave Hansen Subject: Re: [PATCH 4/7] x86,tlb: make lazy TLB mode lazier Message-ID: <20180720110424.GA2512@hirez.programming.kicks-ass.net> References: <20180716190337.26133-1-riel@surriel.com> <20180716190337.26133-5-riel@surriel.com> <20180720093239.GO2494@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180720093239.GO2494@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 20, 2018 at 11:32:39AM +0200, Peter Zijlstra wrote: > + if (!next->mm) { // to kernel > + enter_lazy_tlb(prev->active_mm, next); > + > +#ifdef ARCH_NO_ACTIVE_MM > + next->active_mm = prev->active_mm; > + if (prev->mm) // from user > + mmgrab(prev->active_mm); else prev->active_mm = NULL; > +#endif > + } else { // to user > + switch_mm_irqs_off(prev->active_mm, next->mm, next); > + > +#ifdef ARCH_NO_ACTIVE_MM > + if (!prev->mm) { // from kernel > + /* will mmdrop() in finish_task_switch(). */ > + rq->prev_mm = prev->active_mm; > + prev->active_mm = NULL; > + } > +#endif > }