kern/init.c
[KERNBASE, +oo]: kernel space
KERNBASE: 0xF0000000
[KERNBASE-4MB, KERNBASE]: kernel stack
[MEMORY MAP IO]
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/ mit6282-lab2.md
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June 14, 2020 09:59
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/ 如何安装kernel-debuginfo.md
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September 29, 2023 00:35
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/ offcpu-cost.stp
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May 28, 2020 08:53
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| #! /usr/bin/env stap | |
| # usage: | |
| # stap tools/offcpu-cost.stp -x ${pid} -D MAXSKIPPED=1000000 -t -v -w -T 1 | |
| global MAX_PROBE_NUM = 10000 # max context-switch number | |
| global cur_probe_num = 0 | |
| global begin_sleep_time | |
| global delta |
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/ comp_cost.cpp
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April 13, 2020 09:05
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| #include <iostream> | |
| #include <unordered_map> | |
| #include <vector> | |
| #include <stdint.h> | |
| #include <sys/time.h> | |
| using namespace std; | |
| int main() { |
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/ my_tips.md
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March 8, 2020 05:52
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/ perf_cmd.md
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March 6, 2020 09:42
- 查看top 20占用cpu线程
- ps -eT -o%cpu,pid,tid,ppid,comm | grep -v CPU | sort -n -r | head -20
- 查看系统
- top
- uptime
- vmstat 1 100
- iostat 1 100
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/ how_to_solve.md
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March 25, 2020 07:05
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| #! /usr/bin/env stap | |
| probe kernel.statement("do_generic_file_read@mm/filemap.c:1772") { | |
| printf("%s[%d] %s %ld:\n", execname(), tid(), pp(), $index); | |
| } | |
| probe kernel.function("submit_bio@block/blk-core.c") { | |
| printf("%s[%d] %s i_sector:%lu, size:%u\n", execname(), tid(), pp(), $bio->bi_sector, $bio->bi_size); | |
| } |
alwaysR9
/ download_centos_kernel_source_code.md
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January 17, 2020 15:41
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| echo 1 > /proc/sys/vm/drop_caches | |
| #dd if=data/cache.block.1 bs=4096k count=3000000 of=/dev/null iflag=direct & | |
| #dd if=data/cache.block.2 bs=4096k count=3000000 of=/dev/null iflag=direct & | |
| dd if=data/cache.block.1 bs=4096k count=3000000 of=/dev/null & | |
| dd if=data/cache.block.2 bs=4096k count=3000000 of=/dev/null & |
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