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=-7.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 9BED7C433E0 for ; Wed, 12 Aug 2020 01:38:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7DFC120658 for ; Wed, 12 Aug 2020 01:38:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597196319; bh=9OnJezykRwb6A6y4nYGRkWpeksfwxkP/HdhBrnZpKZk=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=txbEqSFUn6JypGMCar+LClSJIOc7tKxlM8uCOEjRaBFV5TzcfFXnBPD2BMKvJUwFq s5grlwrvMQlxbFSZWSDRHYaAo9NnZ5nQa9vQZFz8cxVdmhDr+o0s7Fd+7EhD7/6x/2 CNInald1rB6yGNHfqutmj7DYQxUrMpW4j2NX6rpE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726473AbgHLBij (ORCPT ); Tue, 11 Aug 2020 21:38:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:41096 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726235AbgHLBij (ORCPT ); Tue, 11 Aug 2020 21:38:39 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2A731207DA; Wed, 12 Aug 2020 01:38:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597196318; bh=9OnJezykRwb6A6y4nYGRkWpeksfwxkP/HdhBrnZpKZk=; h=Date:From:To:Subject:In-Reply-To:From; b=Q5Qzzg9W2kgEDkcEbHWXclcC5NEY494OJM/shHpLg66K7Lqr1GrEDrhLAghjRt4/5 MHil0QMgEukLIkMnctT8OEEaXiijASA806v3EGCfbQlJC0abB8LKDF6GNxaPNTFnOJ Q//S0JtG5rIkON+F8r5j09FwTn8ywzWtEVI/caG4= Date: Tue, 11 Aug 2020 18:38:37 -0700 From: Andrew Morton To: agordeev@linux.ibm.com, akpm@linux-foundation.org, borntraeger@de.ibm.com, gerald.schaefer@de.ibm.com, gor@linux.ibm.com, heiko.carstens@de.ibm.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, peterx@redhat.com, torvalds@linux-foundation.org Subject: [patch 158/165] mm/s390: use general page fault accounting Message-ID: <20200812013837.ooP7MlEI_%akpm@linux-foundation.org> In-Reply-To: <20200811182949.e12ae9a472e3b5e27e16ad6c@linux-foundation.org> User-Agent: s-nail v14.8.16 Sender: mm-commits-owner@vger.kernel.org Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Peter Xu Subject: mm/s390: use general page fault accounting Use the general page fault accounting by passing regs into handle_mm_fault(). It naturally solve the issue of multiple page fault accounting when page fault retry happened. Link: http://lkml.kernel.org/r/20200707225021.200906-19-peterx@redhat.com Signed-off-by: Peter Xu Acked-by: Gerald Schaefer Reviewed-by: Gerald Schaefer Cc: Alexander Gordeev Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Signed-off-by: Andrew Morton --- arch/s390/mm/fault.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) --- a/arch/s390/mm/fault.c~mm-s390-use-general-page-fault-accounting +++ a/arch/s390/mm/fault.c @@ -476,7 +476,7 @@ retry: * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags, NULL); + fault = handle_mm_fault(vma, address, flags, regs); if (fault_signal_pending(fault, regs)) { fault = VM_FAULT_SIGNAL; if (flags & FAULT_FLAG_RETRY_NOWAIT) @@ -486,21 +486,7 @@ retry: if (unlikely(fault & VM_FAULT_ERROR)) goto out_up; - /* - * Major/minor page fault accounting is only done on the - * initial attempt. If we go through a retry, it is extremely - * likely that the page will be found in page cache at that point. - */ if (flags & FAULT_FLAG_ALLOW_RETRY) { - if (fault & VM_FAULT_MAJOR) { - tsk->maj_flt++; - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, - regs, address); - } else { - tsk->min_flt++; - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, - regs, address); - } if (fault & VM_FAULT_RETRY) { if (IS_ENABLED(CONFIG_PGSTE) && gmap && (flags & FAULT_FLAG_RETRY_NOWAIT)) { _