systemtapã®ã¹ã¯ãªããã§ã«ã¼ãã«é¢æ°ãå¼ã¶ã®ã¯ã©ãããã ã£ãï¼ã¨ããã¨ããã®ã¡ã¢ã§ãã cè¨èªã®é¢æ°ãä½ã£ã¦ããããå¼ã³åºãå½¢ã§å®è£ ãã¾ãããsystemtapã®ããã¥ã¢ã« 3 Components of a SystemTap scriptã®3.5~3.7ã«cã®é¢æ°ãçµã¿è¾¼ãæ¹æ³ã®èª¬æãããã¾ãã ã§ãã¨ããããä½ã£ãã®ããã¡ãã #!/usr/bin/env stap %{ #include <linux/sched.h> #include <linux/thread_info.h> %} function show_limit:long() %{ STAP_PRINTF("limit -> 0x%lx\n", current_thread_info()->addr_limit.seg); STAP_RETURN(0); %} probe kernel.function("_d
Understanding How Systemtap Works SystemTapã¯å®è¡ä¸ã®Linuxã·ã¹ãã ããåç´ãªã¹ã¯ãªããã§è©³ç´°ã«èª¿æ»åºæ¥ãããã«è¨è¨ããã¦ããã SystemTapã¹ã¯ãªããã®è£å´ã«ãã主ãªã¢ã¤ãã¢ã¯ãã¤ãã³ãã¨ãã³ãã©ã§ããã SystemTapãã¹ã¯ãªãããå®è¡ããã¨ãSystemTapã¯ã¤ãã³ããç£è¦ãã ããã¦ã¤ãã³ããçºçããã¨ãã³ãã©ãé«éãªãµãã«ã¼ãã³ã¨ãã¦å®è¡ããããã¦ã¾ãç£è¦ã«æ»ãã SystemTapã¯é¢æ°ã®åºå ¥ãã¿ã¤ãã¼ã®çºç«ãã»ãã·ã§ã³ã®åæãªã©ãå¤æ§ãªã¤ãã³ããç£è¦åºæ¥ãã ãã³ãã©ã¯ãä¸ç¨®ã®ã¹ã¯ãªããè¨èªã¨ãã¦ãã¤ãã³ãçºçæã®å¦çãè¨è¿°åºæ¥ãã 3.1 Architecture SystemTapã¹ã¯ãªããã®å®è¡ã¯ã以ä¸ã®ããã«é²è¡ããã ã¹ã¯ãªããããã§ãã¯ãã¦ãtapsetsãtapsetã©ã¤ãã©ãªã«ç½®ãæããã ã¹ã¯ãªããã
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SystemTap on CentOS Install systemtap and the kernel-devel package: yum install systemtap kernel-develUnfortunately CentOS doesn't come with any yum repository for the necessary debuginfo files. You can sometimes find precompiled packages at http://debuginfo.centos.org/ Make sure you download the debuginfo files matching your kernel exactly. You can find out which kernel release and architecture y
SystemTap ã¡ã¢ #0 ã®ç¶ããä»å㯠SystemTap Beginners Guide ã® 3.2. SystemTap Scripts ããæç²ã ã¹ã¯ãªããã®ãã©ã¼ããã SystemTap ã¹ã¯ãªããã®ãã©ã¼ãããã¯ãããªæãã probe event { statements } ãªã®ã§ãåå åºã¦ããã $ stap -v -e 'probe vfs.read { printf("read performed\n"); exit() }' ããã©ã¼ãããã¨ç §ããåããã¦èªã¿è§£ãã¨ããvfs.read ã¤ãã³ããçºçããã read performed ã¨è¡¨ç¤ºã㦠exit ãããã¨ãã£ãæå³ã«ãªãã { statements } ã®é¨å㯠handler ã¨å¼ã°ããevent 㨠ããã«å¯¾å¿ãã handler ãããã㦠probe ã¨å¼ã¶ãããã ã¹ã¯ãªããã®ä¸ã§
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