Eric Lee / smarc-fsl-linux-kernel

01 Nov, 2012

1 commit

07 May, 2012

2 commits

  • f3f096cfe   tracing: Provide trace events interface for uprobes ... Browse Code »
    43

    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 reaches 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

    Signed-off-by: Srikar Dronamraju
    Acked-by: Steven Rostedt
    Acked-by: Masami Hiramatsu
    Cc: Linus Torvalds
    Cc: Ananth N Mavinakayanahalli
    Cc: Jim Keniston
    Cc: Linux-mm
    Cc: Oleg Nesterov
    Cc: Andi Kleen
    Cc: Christoph Hellwig
    Cc: Arnaldo Carvalho de Melo
    Cc: Anton Arapov
    Cc: Peter Zijlstra
    Link: http://lkml.kernel.org/r/20120411103043.GB29437@linux.vnet.ibm.com
    Signed-off-by: Ingo Molnar

    Srikar Dronamraju
     
  • 8ab83f564   tracing: Extract out common code for kprobes/uprobes trace events ... Browse Code »

    Move parts of trace_kprobe.c that can be shared with upcoming
    trace_uprobe.c. Common code to kernel/trace/trace_probe.h and
    kernel/trace/trace_probe.c. There are no functional changes.

    Signed-off-by: Srikar Dronamraju
    Acked-by: Steven Rostedt
    Acked-by: Masami Hiramatsu
    Cc: Linus Torvalds
    Cc: Ananth N Mavinakayanahalli
    Cc: Jim Keniston
    Cc: Linux-mm
    Cc: Oleg Nesterov
    Cc: Andi Kleen
    Cc: Christoph Hellwig
    Cc: Arnaldo Carvalho de Melo
    Cc: Anton Arapov
    Cc: Peter Zijlstra
    Link: http://lkml.kernel.org/r/20120409091144.8343.76218.sendpatchset@srdronam.in.ibm.com
    Signed-off-by: Ingo Molnar

    Srikar Dronamraju