From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f70.google.com (mail-pl0-f70.google.com [209.85.160.70]) by kanga.kvack.org (Postfix) with ESMTP id B2C5A6B0009 for ; Thu, 5 Apr 2018 04:05:38 -0400 (EDT) Received: by mail-pl0-f70.google.com with SMTP id f3-v6so18086451plf.1 for ; Thu, 05 Apr 2018 01:05:38 -0700 (PDT) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id 188sor1374832pgd.215.2018.04.05.01.05.37 for (Google Transport Security); Thu, 05 Apr 2018 01:05:37 -0700 (PDT) From: Jia He Subject: [PATCH v7 3/5] mm/memblock: introduce memblock_search_pfn_regions() Date: Thu, 5 Apr 2018 01:04:36 -0700 Message-Id: <1522915478-5044-4-git-send-email-hejianet@gmail.com> In-Reply-To: <1522915478-5044-1-git-send-email-hejianet@gmail.com> References: <1522915478-5044-1-git-send-email-hejianet@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: 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 This api is to find the memory region index of input pfn. With this helper, we can improve the loop in early_pfn_valid by recording last region index. If current pfn and last pfn are in the same memory region, we needn't do the unnecessary binary searches because the result of memblock_is_nomap is the same for whole memory region. Signed-off-by: Jia He --- include/linux/memblock.h | 2 ++ mm/memblock.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 0257aee..a0127b3 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -203,6 +203,8 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ +int memblock_search_pfn_regions(unsigned long pfn); + /** * for_each_free_mem_range - iterate through free memblock areas * @i: u64 used as loop variable diff --git a/mm/memblock.c b/mm/memblock.c index ba7c878..0f4004c 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1617,6 +1617,15 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr return -1; } +/* search memblock with the input pfn, return the region idx */ +int __init_memblock memblock_search_pfn_regions(unsigned long pfn) +{ + struct memblock_type *type = &memblock.memory; + int mid = memblock_search(type, PFN_PHYS(pfn)); + + return mid; +} + bool __init memblock_is_reserved(phys_addr_t addr) { return memblock_search(&memblock.reserved, addr) != -1; -- 2.7.4