Messages in this thread | | | Date | Mon, 16 Apr 2012 18:43:52 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH 3/3] tracing: Provide trace events interface for uprobes |
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(2012/04/16 18:19), Srikar Dronamraju wrote: > From: Srikar Dronamraju <srikar@linux.vnet.ibm.com> > > Implements trace_event support for uprobes. In its current form it can > be used to put probes at a specified offset in a file and dump the > required registers when the code flow passes through the probed address. > > The following example shows how to dump the instruction pointer and %ax > a register at the probed text address. Here we are trying to probe > zfree in /bin/zsh > > # cd /sys/kernel/debug/tracing/ > # cat /proc/`pgrep zsh`/maps | grep /bin/zsh | grep r-xp > 00400000-0048a000 r-xp 00000000 08:03 130904 /bin/zsh > # objdump -T /bin/zsh | grep -w zfree > 0000000000446420 g DF .text 0000000000000012 Base zfree > # echo 'p /bin/zsh:0x46420 %ip %ax' > uprobe_events > # cat uprobe_events > p:uprobes/p_zsh_0x46420 /bin/zsh:0x0000000000046420 > # echo 1 > events/uprobes/enable > # sleep 20 > # echo 0 > events/uprobes/enable > # cat trace > # tracer: nop > # > # TASK-PID CPU# TIMESTAMP FUNCTION > # | | | | | > zsh-24842 [006] 258544.995456: p_zsh_0x46420: (0x446420) arg1=446421 arg2=79 > zsh-24842 [007] 258545.000270: p_zsh_0x46420: (0x446420) arg1=446421 arg2=79 > zsh-24842 [002] 258545.043929: p_zsh_0x46420: (0x446420) arg1=446421 arg2=79 > zsh-24842 [004] 258547.046129: p_zsh_0x46420: (0x446420) arg1=446421 arg2=79 > > Acked-by: Steven Rostedt <rostedt@goodmis.org> > Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Looks good for me :)
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Thanks!
-- Masami HIRAMATSU Software Platform Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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