From patchwork Thu May 24 17:58:50 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 920047 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40sHWN0VRKz9s19 for ; Fri, 25 May 2018 04:11:12 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="nGM8nper"; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 40sHWM5v0XzF1Qy for ; Fri, 25 May 2018 04:11:11 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="nGM8nper"; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:400e:c05::242; helo=mail-pg0-x242.google.com; envelope-from=npiggin@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="nGM8nper"; dkim-atps=neutral Received: from mail-pg0-x242.google.com (mail-pg0-x242.google.com [IPv6:2607:f8b0:400e:c05::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40sHFg5VrLzF1Rb for ; Fri, 25 May 2018 03:59:19 +1000 (AEST) Received: by mail-pg0-x242.google.com with SMTP id e21-v6so1127990pgv.0 for ; Thu, 24 May 2018 10:59:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=R+lFYoroCbtw3G0UsBZurh+Z8+Vpx4wQpt9kugh/0Lo=; b=nGM8nperFRHPHChxYhq/1RuYodjma4RoretVIx8ru0vWZR7DTUmrbKen8lheoB6NUt W0iWqH7O+ifp/el6dtrbGfl+KmWRCg1fVyBrvYeUbbhxVYaDLD8CS3t3xjPgwEKMy9G3 /KvgfVF6NBBMpLc3av8l2uuCljeTq4fBYN5GuZoSrrOVzCtyZ2Tp1RxHoJJA/MNwL/w0 Y4gONJQpEi+rB6zX84eFFuZsjugW3qqI8yJCEZ9gB9c6j1SI1ncxMqlK46NVoefXboMP Ntk+B6aYVLAT4fDiHbHkiswHA13z2iU3JBAddybnirYxSWKo/lvdMMMvN7H/kEpCSIek P8Rg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=R+lFYoroCbtw3G0UsBZurh+Z8+Vpx4wQpt9kugh/0Lo=; b=H5WpzDp1g9Qd8s5YBGxrqYGvnlEn3LEqR44YLS1lqKIqs/oQ6VgHXaB5hQbjDvbIKB 1RbmzGDzbnTo0fb8gQFVjqtpUTZ7Zuyms4NlFe8LUibQRPocLj1s+X1UO5LyjQYW7ZiK ujafyV/pZgIOON9cAYagoAmUnsQgx/+IWOn/6iMnuVYMk88vT9zfUSBQNmZHsA3MLePY 5g4abmMfybHXOJy5c6Ovjo7vPDIY+BiUqE29IvhzJVc1hxTOEEvM4Q2ULbsvi2PFtcvI MwMd55tMzRGdVL+mX+sYjncsFIcS0lAdDJya8Ucb6nfFZqx8fuGdD70ETdU/uZKItjEg DAxg== X-Gm-Message-State: ALKqPwcEwyu5DE8uJ/E5V5u3aCnWsz8OTTnpQcEjpDsW+lSxPs5V5t5X qdqxaGHY4QB/SJ4XXRuk8PDsfULt X-Google-Smtp-Source: AB8JxZrEEZQLYx0DUaOUa8Ea3ZZlCtTvDh+vNd3kKa82maklzHJx9aUhfyJ+T16oJ5/zWeSKBjBVWA== X-Received: by 2002:a62:66dd:: with SMTP id s90-v6mr8275365pfj.123.1527184757841; Thu, 24 May 2018 10:59:17 -0700 (PDT) Received: from roar.au.ibm.com ([1.128.253.12]) by smtp.gmail.com with ESMTPSA id v14-v6sm34833483pfn.105.2018.05.24.10.59.15 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 May 2018 10:59:17 -0700 (PDT) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v3 4/7] powerpc/64s/radix: prefetch user address in update_mmu_cache Date: Fri, 25 May 2018 03:58:50 +1000 Message-Id: <20180524175853.19695-5-npiggin@gmail.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180524175853.19695-1-npiggin@gmail.com> References: <20180524175853.19695-1-npiggin@gmail.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nicholas Piggin Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Prefetch the faulting address in update_mmu_cache to give the page table walker perhaps 100 cycles head start as locks are dropped and the interrupt completed. Signed-off-by: Nicholas Piggin --- arch/powerpc/mm/mem.c | 4 +++- arch/powerpc/mm/pgtable-book3s64.c | 3 ++- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index c3c39b02b2ba..8cecda4bd66a 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -509,8 +509,10 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, */ unsigned long access, trap; - if (radix_enabled()) + if (radix_enabled()) { + prefetch((void *)address); return; + } /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ if (!pte_young(*ptep) || address >= TASK_SIZE) diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c index 994492453f0e..7ce889a7e5ce 100644 --- a/arch/powerpc/mm/pgtable-book3s64.c +++ b/arch/powerpc/mm/pgtable-book3s64.c @@ -145,7 +145,8 @@ pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmd) { - return; + if (radix_enabled()) + prefetch((void *)addr); } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */