From patchwork Wed Apr 3 08:38:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 13615383 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2C63EC6FD1F for ; Wed, 3 Apr 2024 08:39:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Pt6Tb7wmQOd0BgQpEaaInZdJtY9p8I9zbYhGH4MVfaw=; b=pYMYqjIjEsBbHQ 4cfcO8uiSryeuHDxca7mJfkQByoJRTE2ri+XuWoigVJ42JopanbQufJv9U2LK7l7hACvgEJHFII/p MOkg3qgU89+xn4pPhzGxDhzlMlwlyOy00Ipii3lzbRGJkUlC6v6DAikoGcqTte3mYja6UPz4ys50B GUg8eyIOZxx9I9CK4lhtQGeAx+iJoIhER0MBEOe2T+cX8WLJGokVEqx2oY49cRdB0v0vZ+fPX3BXy K+L7o5RXZZUFH7Kg6w6D/OScKVpou5TMFzkfMJ8jNy63870P8qskgp8Xz24M0nST+3gK6n6d7yfBI klh+ystXoAn8E08pvVnQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rrw9B-0000000EwZS-1AHL; Wed, 03 Apr 2024 08:39:05 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rrw8v-0000000EwJX-2xwj; Wed, 03 Apr 2024 08:38:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:Content-Transfer-Encoding :MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From: Sender:Reply-To:Content-ID:Content-Description; bh=dnCIzWeY1qqTgbyWio8O1U8KrwKcOC13DqOIgOib+lg=; b=Qk8Rlfearr7rsoxMj5+r50lIys A2hYn0SrFqZDoOU7/gvdKTcyegTI74sE2WL3sHMXovcnpyXDnFxIMYPY7bBb8QH45KWANwwUFtVV+ 6cM35HO4e2H5c+MqFE4E6cvNMgSnc/cblnXplK65UIkkMUWA95dhL3g8TlFf5FRIGn5xXQToeyty4 mbeQF814vsJi4Yd+Mq2BXXHzjrlWEmuVTM6RRNrz30ZMzjeMUctApeNr0AcSMQIUmD5oE+j3Iuolj 2xZjSX/h5vIAtdmNoS643NDjkmVd7AfytUAeOg7+pnqdmJZQI0qtUJZuwfYyH3+G0DxliIwHm2cFV VHA/qmJA==; Received: from szxga05-in.huawei.com ([45.249.212.191]) by desiato.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rrw8p-000000046AM-3osN; Wed, 03 Apr 2024 08:38:47 +0000 Received: from mail.maildlp.com (unknown [172.19.88.163]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4V8dP72twYz1h5XQ; Wed, 3 Apr 2024 16:35:39 +0800 (CST) Received: from dggpemm100001.china.huawei.com (unknown [7.185.36.93]) by mail.maildlp.com (Postfix) with ESMTPS id D79AA18001A; Wed, 3 Apr 2024 16:38:24 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Wed, 3 Apr 2024 16:38:23 +0800 From: Kefeng Wang To: CC: Russell King , Catalin Marinas , Will Deacon , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Gordeev , Gerald Schaefer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , , , , , , , , Kefeng Wang Subject: [PATCH v2 2/7] arm64: mm: accelerate pagefault when VM_FAULT_BADACCESS Date: Wed, 3 Apr 2024 16:38:00 +0800 Message-ID: <20240403083805.1818160-3-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> References: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm100001.china.huawei.com (7.185.36.93) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240403_093844_563978_7B356A24 X-CRM114-Status: GOOD ( 11.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The vm_flags of vma already checked under per-VMA lock, if it is a bad access, directly set fault to VM_FAULT_BADACCESS and handle error, no need to retry with mmap_lock again, the latency time reduces 34% in 'lat_sig -P 1 prot lat_sig' from lmbench testcase. Since the page faut is handled under per-VMA lock, count it as a vma lock event with VMA_LOCK_SUCCESS. Reviewed-by: Suren Baghdasaryan Signed-off-by: Kefeng Wang Reviewed-by: Catalin Marinas --- arch/arm64/mm/fault.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 9bb9f395351a..405f9aa831bd 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -572,7 +572,9 @@ static int __kprobes do_page_fault(unsigned long far, unsigned long esr, if (!(vma->vm_flags & vm_flags)) { vma_end_read(vma); - goto lock_mmap; + fault = VM_FAULT_BADACCESS; + count_vm_vma_lock_event(VMA_LOCK_SUCCESS); + goto done; } fault = handle_mm_fault(vma, addr, mm_flags | FAULT_FLAG_VMA_LOCK, regs); if (!(fault & (VM_FAULT_RETRY | VM_FAULT_COMPLETED)))