From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Peter Xu Subject: [PATCH 18/26] mm/s390: Use general page fault accounting Date: Fri, 26 Jun 2020 18:36:27 -0400 Message-Id: <20200626223627.199861-1-peterx@redhat.com> In-Reply-To: <20200626223130.199227-1-peterx@redhat.com> References: <20200626223130.199227-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Peter Xu , Andrew Morton , Linus Torvalds , Gerald Schaefer , Andrea Arcangeli , Will Deacon , Michael Ellerman , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , linux-s390@vger.kernel.org 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. CC: Heiko Carstens CC: Vasily Gorbik CC: Christian Borntraeger CC: linux-s390@vger.kernel.org Signed-off-by: Peter Xu --- arch/s390/mm/fault.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index ab6d7eedcfab..4d62ca7d3e09 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -479,7 +479,7 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access) * 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) @@ -489,21 +489,7 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access) 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)) { -- 2.26.2