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| Started by | Xishi Qiu <qiuxishi@huawei.com> |
|---|---|
| First post | 2015-11-20 09:20 +0100 |
| Last post | 2015-11-20 10:50 +0100 |
| Articles | 3 — 2 participants |
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[RFC] mm: direct mapping count in /proc/meminfo is error Xishi Qiu <qiuxishi@huawei.com> - 2015-11-20 09:20 +0100
Re: [RFC] mm: direct mapping count in /proc/meminfo is error Tang Chen <tangchen@cn.fujitsu.com> - 2015-11-20 09:50 +0100
Re: [RFC] mm: direct mapping count in /proc/meminfo is error Xishi Qiu <qiuxishi@huawei.com> - 2015-11-20 10:50 +0100
| From | Xishi Qiu <qiuxishi@huawei.com> |
|---|---|
| Date | 2015-11-20 09:20 +0100 |
| Subject | [RFC] mm: direct mapping count in /proc/meminfo is error |
| Message-ID | <qwP5h-4EO-51@gated-at.bofh.it> |
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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Tang Chen <tangchen@cn.fujitsu.com> |
|---|---|
| Date | 2015-11-20 09:50 +0100 |
| Message-ID | <qwPyj-4PB-37@gated-at.bofh.it> |
| In reply to | #1273809 |
Hi Shi, Would you please share where did you add the printk debug info ? 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Xishi Qiu <qiuxishi@huawei.com> |
|---|---|
| Date | 2015-11-20 10:50 +0100 |
| Message-ID | <qwQun-5rq-33@gated-at.bofh.it> |
| In reply to | #1273856 |
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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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