linux-kernel - Re: [PATCH UPDATED 3/3] tracing: Provide trace events interface for uprobes

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Date:	Thu, 12 Apr 2012 20:19:27 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anton Arapov <anton@...hat.com>
Subject: Re: [PATCH UPDATED 3/3] tracing: Provide trace events interface
 for uprobes

> > +
> > +    # echo 'p /bin/zsh:0x46420 %ip %ax' > uprobe_events
> > +
> > +Please note: User has to explicitly calculate the offset of the probepoint
> > +in the object. We can see the events that are registered by looking at the
> > +uprobe_events file.
> > +
> > +    # cat uprobe_events
> > +    p:uprobes/p_zsh_0x46420 /bin/zsh:0x0000000000046420
> 
> Doesn't uprobe_events show the arguments of existing events?
> And also, could you add an event format of above event here?
> 

[root@...kvm tracing]#  cat uprobe_events 
[root@...kvm tracing]# echo 'p /bin/zsh:0x46420 %ip %ax' > uprobe_events 
[root@...kvm tracing]#  cat uprobe_events 
p:uprobes/p_zsh_0x46420 /bin/zsh:0x00046420 arg1=%ip arg2=%ax
[root@...kvm tracing]#  cat events/uprobes/p_zsh_0x46420/format 
name: p_zsh_0x46420
ID: 922
format:
        field:unsigned short common_type;       offset:0;       size:2; signed:0;
        field:unsigned char common_flags;       offset:2;       size:1; signed:0;
        field:unsigned char common_preempt_count;       offset:3;       size:1; signed:0;
        field:int common_pid;   offset:4;       size:4; signed:1;
        field:int common_padding;       offset:8;       size:4; signed:1;

        field:unsigned long __probe_ip; offset:12;      size:4; signed:0;
        field:u32 arg1; offset:16;      size:4; signed:0;
        field:u32 arg2; offset:20;      size:4; signed:0;

print fmt: "(%lx) arg1=%lx arg2=%lx", REC->__probe_ip, REC->arg1, REC->arg2
[root@...kvm tracing]# 

Will update the Documentation file  with correct output of "cat
uprobe_events". Do you want the format file to be added to the
Documentation?

-- 
Thanks and Regards
Srikar

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