From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f181.google.com (mail-yk0-f181.google.com [209.85.160.181]) by kanga.kvack.org (Postfix) with ESMTP id 1A7836B0253 for ; Fri, 20 Nov 2015 04:51:27 -0500 (EST) Received: by ykdr82 with SMTP id r82so152347108ykd.3 for ; Fri, 20 Nov 2015 01:51:26 -0800 (PST) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com. [58.251.152.64]) by mx.google.com with ESMTPS id y81si9546809ywy.200.2015.11.20.01.51.25 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 20 Nov 2015 01:51:26 -0800 (PST) Message-ID: <564EEC06.9030501@huawei.com> Date: Fri, 20 Nov 2015 17:46:46 +0800 From: Xishi Qiu MIME-Version: 1.0 Subject: Re: [RFC] mm: direct mapping count in /proc/meminfo is error References: <564ED708.5090405@huawei.com> <564EDD3F.6070302@cn.fujitsu.com> In-Reply-To: <564EDD3F.6070302@cn.fujitsu.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Tang Chen Cc: Andrew Morton , zhong jiang , Minchan Kim , Mel Gorman , Linux MM , LKML On 2015/11/20 16:43, Tang Chen wrote: > Hi Shi, > > Would you please share where did you add the printk debug info ? > Sure, at the end of init_mem_mapping(), I add a new function, like arch_report_meminfo(), just change "seq_printf" to "printk". Thanks, Xishi Qiu > Thanks. :) > > On 11/20/2015 04:17 PM, Xishi Qiu wrote: >> I find the direct mapping count in /proc/meminfo is error. >> The value should be equal to the size of init_memory_mapping which >> showed in boot log. >> >> I add some print to show direct_pages_count[] immediately after >> init_memory_mapping(). The reason is that we double counting. >> >> Here is the log(kernel v4.4): >> ... >> [ 0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff] // called from "init_memory_mapping(0, ISA_END_ADDRESS);" >> [ 0.000000] [mem 0x00000000-0x000fffff] page 4k >> [ 0.000000] BRK [0x01ebf000, 0x01ebffff] PGTABLE >> [ 0.000000] BRK [0x01ec0000, 0x01ec0fff] PGTABLE >> [ 0.000000] BRK [0x01ec1000, 0x01ec1fff] PGTABLE >> [ 0.000000] init_memory_mapping: [mem 0xc3fe00000-0xc3fffffff] // called from "memory_map_top_down(ISA_END_ADDRESS, end);" >> [ 0.000000] [mem 0xc3fe00000-0xc3fffffff] page 1G // increase count of PG_LEVEL_1G in c00000000(48G)-c3fffffff(49G) one time >> [ 0.000000] init_memory_mapping: [mem 0xc20000000-0xc3fdfffff] >> [ 0.000000] [mem 0xc20000000-0xc3fdfffff] page 1G // increase count of PG_LEVEL_1G in c00000000(48G)-c3fffffff(49G) two time >> [ 0.000000] init_memory_mapping: [mem 0x00100000-0xbf78ffff] >> [ 0.000000] [mem 0x00100000-0x001fffff] page 4k >> [ 0.000000] [mem 0x00200000-0x3fffffff] page 2M >> [ 0.000000] [mem 0x40000000-0x7fffffff] page 1G >> [ 0.000000] [mem 0x80000000-0xbf5fffff] page 2M >> [ 0.000000] [mem 0xbf600000-0xbf78ffff] page 4k >> [ 0.000000] init_memory_mapping: [mem 0x100000000-0xc1fffffff] >> [ 0.000000] [mem 0x100000000-0xc1fffffff] page 1G // increase count of PG_LEVEL_1G in c00000000(48G)-c3fffffff(49G) three time >> ... >> [ 0.000000] DirectMap4k: 3648 kB >> [ 0.000000] DirectMap2M: 2084864 kB >> [ 0.000000] DirectMap1G: 50331648 kB >> >> euler-linux:~ # cat /proc/meminfo | grep DirectMap >> DirectMap4k: 91712 kB >> DirectMap2M: 4093952 kB >> DirectMap1G: 48234496 kB >> >> >> total DirectMap is 48234496 + 4093952 + 91712 = 52420160kb >> 50331648 + 2084864 + 3648 = 52420160kb >> total init_memory_mapping is 50323008kb >> >> 52420160kb - 50323008kb = 2097152kb = 2G >> >> However I haven't find a better way to fix it, any ideas? >> >> Thanks, >> Xishi Qiu >> >> >> . >> > > > . > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org