From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751913AbeDEIFx (ORCPT ); Thu, 5 Apr 2018 04:05:53 -0400 Received: from mail-pl0-f68.google.com ([209.85.160.68]:37290 "EHLO mail-pl0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751726AbeDEIFu (ORCPT ); Thu, 5 Apr 2018 04:05:50 -0400 X-Google-Smtp-Source: AIpwx49doOW0U9jqEakBTlyXKq1m0mWBbKMhrUpfdBZ0DEQ7z9U+M95lLc8Sj/28NA1Knfooya8Orw== From: Jia He To: Russell King , Catalin Marinas , Will Deacon , Mark Rutland , Ard Biesheuvel , Andrew Morton , Michal Hocko Cc: Wei Yang , Kees Cook , Laura Abbott , Vladimir Murzin , Philip Derrin , AKASHI Takahiro , James Morse , Steve Capper , Pavel Tatashin , Gioh Kim , Vlastimil Babka , Mel Gorman , Johannes Weiner , Kemi Wang , Petr Tesarik , YASUAKI ISHIMATSU , Andrey Ryabinin , Nikolay Borisov , Daniel Jordan , Daniel Vacek , Eugeniu Rosca , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Jia He , Jia He Subject: [PATCH v7 4/5] arm: arm64: introduce pfn_valid_region() Date: Thu, 5 Apr 2018 01:04:37 -0700 Message-Id: <1522915478-5044-5-git-send-email-hejianet@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1522915478-5044-1-git-send-email-hejianet@gmail.com> References: <1522915478-5044-1-git-send-email-hejianet@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where possible") optimized the loop in memmap_init_zone(). But there is still some room for improvement. E.g. in early_pfn_valid(), we can record the last returned memblock region. If current pfn and last pfn are in the same memory region, we needn't do the unnecessary binary searches because memblock_is_nomap is the same result for whole memory region. Signed-off-by: Jia He --- include/linux/arm96_common.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/linux/arm96_common.h b/include/linux/arm96_common.h index 2f4dea4..bb86bd3 100644 --- a/include/linux/arm96_common.h +++ b/include/linux/arm96_common.h @@ -48,5 +48,29 @@ ulong __init_memblock memblock_next_valid_pfn(ulong pfn) return PHYS_PFN(regions[early_region_idx].base); } EXPORT_SYMBOL(memblock_next_valid_pfn); + +int pfn_valid_region(ulong pfn) +{ + ulong start_pfn, end_pfn; + struct memblock_type *type = &memblock.memory; + struct memblock_region *regions = type->regions; + + if (early_region_idx != -1) { + start_pfn = PFN_DOWN(regions[early_region_idx].base); + end_pfn = PFN_DOWN(regions[early_region_idx].base + + regions[early_region_idx].size); + + if (pfn >= start_pfn && pfn < end_pfn) + return !memblock_is_nomap( + ®ions[early_region_idx]); + } + + early_region_idx = memblock_search_pfn_regions(pfn); + if (early_region_idx == -1) + return false; + + return !memblock_is_nomap(®ions[early_region_idx]); +} +EXPORT_SYMBOL(pfn_valid_region); #endif /*CONFIG_HAVE_ARCH_PFN_VALID*/ #endif /*__ARM96_COMMON_H*/ -- 2.7.4