tracing/kprobes: Add argument name support
Add argument name assignment support and remove "alias" lines from format. This allows user to assign unique name to each argument. For example, $ echo p do_sys_open dfd=a0 filename=a1 flags=a2 mode=a3 > kprobe_events This assigns dfd, filename, flags, and mode to 1st - 4th arguments respectively. Trace buffer shows those names too. <...>-1439 [000] 1200885.933147: do_sys_open+0x0/0xdf: dfd=ffffff9c filename=bfa898ac flags=8000 mode=0 This helps users to know what each value means. Users can filter each events by these names too. Note that you can not filter by argN anymore. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <20090910235337.22412.77383.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Masami Hiramatsu
Frederic Weisbecker
Родитель
e08d1c657f
Коммит
eca0d916f6
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@ -42,7 +42,8 @@ Synopsis of kprobe_events
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aN : Fetch function argument. (N >= 0)(*)
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rv : Fetch return value.(**)
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ra : Fetch return address.(**)
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+|-offs(FETCHARG) : fetch memory at FETCHARG +|- offs address.(***)
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+|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(***)
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NAME=FETCHARG: Set NAME as the argument name of FETCHARG.
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(*) aN may not correct on asmlinkaged functions and at the middle of
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function body.
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@ -62,12 +63,10 @@ enabled:
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You can enable/disable the probe by writing 1 or 0 on it.
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format:
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This shows the format of this probe event. It also shows aliases of arguments
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which you specified to kprobe_events.
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This shows the format of this probe event.
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filter:
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You can write filtering rules of this event. And you can use both of aliase
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names and field names for describing filters.
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You can write filtering rules of this event.
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id:
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This shows the id of this probe event.
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@ -85,10 +84,11 @@ Usage examples
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To add a probe as a new event, write a new definition to kprobe_events
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as below.
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echo p:myprobe do_sys_open a0 a1 a2 a3 > /sys/kernel/debug/tracing/kprobe_events
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echo p:myprobe do_sys_open dfd=a0 filename=a1 flags=a2 mode=a3 > /sys/kernel/debug/tracing/kprobe_events
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This sets a kprobe on the top of do_sys_open() function with recording
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1st to 4th arguments as "myprobe" event.
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1st to 4th arguments as "myprobe" event. As this example shows, users can
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choose more familiar names for each arguments.
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echo r:myretprobe do_sys_open rv ra >> /sys/kernel/debug/tracing/kprobe_events
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@ -99,7 +99,7 @@ recording return value and return address as "myretprobe" event.
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cat /sys/kernel/debug/tracing/events/kprobes/myprobe/format
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name: myprobe
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ID: 23
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ID: 75
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format:
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field:unsigned short common_type; offset:0; size:2;
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field:unsigned char common_flags; offset:2; size:1;
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@ -109,21 +109,15 @@ format:
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field: unsigned long ip; offset:16;tsize:8;
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field: int nargs; offset:24;tsize:4;
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field: unsigned long arg0; offset:32;tsize:8;
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field: unsigned long arg1; offset:40;tsize:8;
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field: unsigned long arg2; offset:48;tsize:8;
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field: unsigned long arg3; offset:56;tsize:8;
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field: unsigned long dfd; offset:32;tsize:8;
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field: unsigned long filename; offset:40;tsize:8;
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field: unsigned long flags; offset:48;tsize:8;
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field: unsigned long mode; offset:56;tsize:8;
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alias: a0; original: arg0;
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alias: a1; original: arg1;
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alias: a2; original: arg2;
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alias: a3; original: arg3;
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print fmt: "%lx: 0x%lx 0x%lx 0x%lx 0x%lx", ip, arg0, arg1, arg2, arg3
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print fmt: "%lx: dfd=%lx filename=%lx flags=%lx mode=%lx", ip, REC->dfd, REC->filename, REC->flags, REC->mode
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You can see that the event has 4 arguments and alias expressions
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corresponding to it.
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You can see that the event has 4 arguments as in the expressions you specified.
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echo > /sys/kernel/debug/tracing/kprobe_events
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@ -135,12 +129,12 @@ corresponding to it.
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#
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# TASK-PID CPU# TIMESTAMP FUNCTION
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# | | | | |
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<...>-1447 [001] 1038282.286875: do_sys_open+0x0/0xd6: 0x3 0x7fffd1ec4440 0x8000 0x0
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<...>-1447 [001] 1038282.286878: sys_openat+0xc/0xe <- do_sys_open: 0xfffffffffffffffe 0xffffffff81367a3a
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<...>-1447 [001] 1038282.286885: do_sys_open+0x0/0xd6: 0xffffff9c 0x40413c 0x8000 0x1b6
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<...>-1447 [001] 1038282.286915: sys_open+0x1b/0x1d <- do_sys_open: 0x3 0xffffffff81367a3a
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<...>-1447 [001] 1038282.286969: do_sys_open+0x0/0xd6: 0xffffff9c 0x4041c6 0x98800 0x10
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<...>-1447 [001] 1038282.286976: sys_open+0x1b/0x1d <- do_sys_open: 0x3 0xffffffff81367a3a
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<...>-1447 [001] 1038282.286875: do_sys_open+0x0/0xd6: dfd=3 filename=7fffd1ec4440 flags=8000 mode=0
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<...>-1447 [001] 1038282.286878: sys_openat+0xc/0xe <- do_sys_open: rv=fffffffffffffffe ra=ffffffff81367a3a
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<...>-1447 [001] 1038282.286885: do_sys_open+0x0/0xd6: dfd=ffffff9c filename=40413c flags=8000 mode=1b6
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<...>-1447 [001] 1038282.286915: sys_open+0x1b/0x1d <- do_sys_open: rv=3 ra=ffffffff81367a3a
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<...>-1447 [001] 1038282.286969: do_sys_open+0x0/0xd6: dfd=ffffff9c filename=4041c6 flags=98800 mode=10
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<...>-1447 [001] 1038282.286976: sys_open+0x1b/0x1d <- do_sys_open: rv=3 ra=ffffffff81367a3a
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Each line shows when the kernel hits a probe, and <- SYMBOL means kernel
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@ -176,9 +176,14 @@ static __kprobes void free_indirect_fetch_data(struct indirect_fetch_data *data)
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}
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/**
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* kprobe_trace_core
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* Kprobe tracer core functions
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*/
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struct probe_arg {
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struct fetch_func fetch;
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const char *name;
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};
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struct trace_probe {
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struct list_head list;
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struct kretprobe rp; /* Use rp.kp for kprobe use */
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@ -187,12 +192,12 @@ struct trace_probe {
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struct ftrace_event_call call;
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struct trace_event event;
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unsigned int nr_args;
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struct fetch_func args[];
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struct probe_arg args[];
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};
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#define SIZEOF_TRACE_PROBE(n) \
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(offsetof(struct trace_probe, args) + \
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(sizeof(struct fetch_func) * (n)))
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(sizeof(struct probe_arg) * (n)))
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static int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs);
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static int kretprobe_trace_func(struct kretprobe_instance *ri,
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@ -301,15 +306,21 @@ error:
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return ERR_PTR(-ENOMEM);
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}
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static void free_probe_arg(struct probe_arg *arg)
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{
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if (arg->fetch.func == fetch_symbol)
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free_symbol_cache(arg->fetch.data);
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else if (arg->fetch.func == fetch_indirect)
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free_indirect_fetch_data(arg->fetch.data);
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kfree(arg->name);
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}
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static void free_trace_probe(struct trace_probe *tp)
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{
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int i;
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for (i = 0; i < tp->nr_args; i++)
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if (tp->args[i].func == fetch_symbol)
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free_symbol_cache(tp->args[i].data);
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else if (tp->args[i].func == fetch_indirect)
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free_indirect_fetch_data(tp->args[i].data);
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free_probe_arg(&tp->args[i]);
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kfree(tp->call.name);
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kfree(tp->symbol);
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@ -532,11 +543,13 @@ static int create_trace_probe(int argc, char **argv)
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* %REG : fetch register REG
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* Indirect memory fetch:
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* +|-offs(ARG) : fetch memory at ARG +|- offs address.
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* Alias name of args:
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* NAME=FETCHARG : set NAME as alias of FETCHARG.
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*/
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struct trace_probe *tp;
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int i, ret = 0;
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int is_return = 0;
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char *symbol = NULL, *event = NULL;
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char *symbol = NULL, *event = NULL, *arg = NULL;
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unsigned long offset = 0;
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void *addr = NULL;
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char buf[MAX_EVENT_NAME_LEN];
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@ -596,12 +609,21 @@ static int create_trace_probe(int argc, char **argv)
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/* parse arguments */
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ret = 0;
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for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
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if (strlen(argv[i]) > MAX_ARGSTR_LEN) {
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pr_info("Argument%d(%s) is too long.\n", i, argv[i]);
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/* Parse argument name */
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arg = strchr(argv[i], '=');
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if (arg)
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*arg++ = '\0';
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else
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arg = argv[i];
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tp->args[i].name = kstrdup(argv[i], GFP_KERNEL);
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/* Parse fetch argument */
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if (strlen(arg) > MAX_ARGSTR_LEN) {
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pr_info("Argument%d(%s) is too long.\n", i, arg);
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ret = -ENOSPC;
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goto error;
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}
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ret = parse_probe_arg(argv[i], &tp->args[i], is_return);
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ret = parse_probe_arg(arg, &tp->args[i].fetch, is_return);
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if (ret)
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goto error;
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}
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@ -664,12 +686,12 @@ static int probes_seq_show(struct seq_file *m, void *v)
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seq_printf(m, " 0x%p", tp->rp.kp.addr);
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for (i = 0; i < tp->nr_args; i++) {
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ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]);
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ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i].fetch);
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if (ret < 0) {
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pr_warning("Argument%d decoding error(%d).\n", i, ret);
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return ret;
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}
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seq_printf(m, " %s", buf);
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seq_printf(m, " %s=%s", tp->args[i].name, buf);
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}
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seq_printf(m, "\n");
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return 0;
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@ -824,7 +846,7 @@ static __kprobes int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
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entry->nargs = tp->nr_args;
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entry->ip = (unsigned long)kp->addr;
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for (i = 0; i < tp->nr_args; i++)
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entry->args[i] = call_fetch(&tp->args[i], regs);
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entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
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if (!filter_current_check_discard(buffer, call, entry, event))
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trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
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@ -858,7 +880,7 @@ static __kprobes int kretprobe_trace_func(struct kretprobe_instance *ri,
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entry->func = (unsigned long)tp->rp.kp.addr;
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entry->ret_ip = (unsigned long)ri->ret_addr;
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for (i = 0; i < tp->nr_args; i++)
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entry->args[i] = call_fetch(&tp->args[i], regs);
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entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
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if (!filter_current_check_discard(buffer, call, entry, event))
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trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
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@ -872,9 +894,13 @@ print_kprobe_event(struct trace_iterator *iter, int flags)
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{
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struct kprobe_trace_entry *field;
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struct trace_seq *s = &iter->seq;
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struct trace_event *event;
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struct trace_probe *tp;
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int i;
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field = (struct kprobe_trace_entry *)iter->ent;
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event = ftrace_find_event(field->ent.type);
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tp = container_of(event, struct trace_probe, event);
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if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
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goto partial;
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@ -883,7 +909,8 @@ print_kprobe_event(struct trace_iterator *iter, int flags)
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goto partial;
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for (i = 0; i < field->nargs; i++)
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if (!trace_seq_printf(s, " 0x%lx", field->args[i]))
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if (!trace_seq_printf(s, " %s=%lx",
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tp->args[i].name, field->args[i]))
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goto partial;
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if (!trace_seq_puts(s, "\n"))
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@ -899,9 +926,13 @@ print_kretprobe_event(struct trace_iterator *iter, int flags)
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{
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struct kretprobe_trace_entry *field;
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struct trace_seq *s = &iter->seq;
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struct trace_event *event;
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struct trace_probe *tp;
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int i;
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field = (struct kretprobe_trace_entry *)iter->ent;
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event = ftrace_find_event(field->ent.type);
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tp = container_of(event, struct trace_probe, event);
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if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET))
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goto partial;
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@ -916,7 +947,8 @@ print_kretprobe_event(struct trace_iterator *iter, int flags)
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goto partial;
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for (i = 0; i < field->nargs; i++)
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if (!trace_seq_printf(s, " 0x%lx", field->args[i]))
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if (!trace_seq_printf(s, " %s=%lx",
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tp->args[i].name, field->args[i]))
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goto partial;
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if (!trace_seq_puts(s, "\n"))
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@ -972,7 +1004,6 @@ static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
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{
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int ret, i;
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struct kprobe_trace_entry field;
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char buf[MAX_ARGSTR_LEN + 1];
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struct trace_probe *tp = (struct trace_probe *)event_call->data;
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ret = trace_define_common_fields(event_call);
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@ -981,16 +1012,9 @@ static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
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DEFINE_FIELD(unsigned long, ip, "ip", 0);
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DEFINE_FIELD(int, nargs, "nargs", 1);
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for (i = 0; i < tp->nr_args; i++) {
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/* Set argN as a field */
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sprintf(buf, "arg%d", i);
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DEFINE_FIELD(unsigned long, args[i], buf, 0);
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/* Set argument string as an alias field */
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ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]);
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if (ret < 0)
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return ret;
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DEFINE_FIELD(unsigned long, args[i], buf, 0);
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}
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/* Set argument names as fields */
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for (i = 0; i < tp->nr_args; i++)
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DEFINE_FIELD(unsigned long, args[i], tp->args[i].name, 0);
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return 0;
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}
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@ -998,7 +1022,6 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
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{
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int ret, i;
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struct kretprobe_trace_entry field;
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char buf[MAX_ARGSTR_LEN + 1];
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struct trace_probe *tp = (struct trace_probe *)event_call->data;
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ret = trace_define_common_fields(event_call);
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@ -1008,16 +1031,9 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
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DEFINE_FIELD(unsigned long, func, "func", 0);
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DEFINE_FIELD(unsigned long, ret_ip, "ret_ip", 0);
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DEFINE_FIELD(int, nargs, "nargs", 1);
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for (i = 0; i < tp->nr_args; i++) {
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/* Set argN as a field */
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sprintf(buf, "arg%d", i);
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DEFINE_FIELD(unsigned long, args[i], buf, 0);
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/* Set argument string as an alias field */
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ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]);
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if (ret < 0)
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return ret;
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DEFINE_FIELD(unsigned long, args[i], buf, 0);
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}
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/* Set argument names as fields */
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for (i = 0; i < tp->nr_args; i++)
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DEFINE_FIELD(unsigned long, args[i], tp->args[i].name, 0);
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return 0;
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}
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@ -1025,31 +1041,21 @@ static int __probe_event_show_format(struct trace_seq *s,
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struct trace_probe *tp, const char *fmt,
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const char *arg)
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{
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int i, ret;
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char buf[MAX_ARGSTR_LEN + 1];
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int i;
|
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|
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/* Show aliases */
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for (i = 0; i < tp->nr_args; i++) {
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ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i]);
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if (ret < 0)
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return ret;
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if (!trace_seq_printf(s, "\talias: %s;\toriginal: arg%d;\n",
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buf, i))
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return 0;
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}
|
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/* Show format */
|
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if (!trace_seq_printf(s, "\nprint fmt: \"%s", fmt))
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return 0;
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|
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for (i = 0; i < tp->nr_args; i++)
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if (!trace_seq_puts(s, " 0x%lx"))
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if (!trace_seq_printf(s, " %s=%%lx", tp->args[i].name))
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return 0;
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if (!trace_seq_printf(s, "\", %s", arg))
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < tp->nr_args; i++)
|
||||
if (!trace_seq_printf(s, ", arg%d", i))
|
||||
if (!trace_seq_printf(s, ", REC->%s", tp->args[i].name))
|
||||
return 0;
|
||||
|
||||
return trace_seq_puts(s, "\n");
|
||||
|
|
@ -1071,17 +1077,14 @@ static int kprobe_event_show_format(struct ftrace_event_call *call,
|
|||
{
|
||||
struct kprobe_trace_entry field __attribute__((unused));
|
||||
int ret, i;
|
||||
char buf[8];
|
||||
struct trace_probe *tp = (struct trace_probe *)call->data;
|
||||
|
||||
SHOW_FIELD(unsigned long, ip, "ip");
|
||||
SHOW_FIELD(int, nargs, "nargs");
|
||||
|
||||
/* Show fields */
|
||||
for (i = 0; i < tp->nr_args; i++) {
|
||||
sprintf(buf, "arg%d", i);
|
||||
SHOW_FIELD(unsigned long, args[i], buf);
|
||||
}
|
||||
for (i = 0; i < tp->nr_args; i++)
|
||||
SHOW_FIELD(unsigned long, args[i], tp->args[i].name);
|
||||
trace_seq_puts(s, "\n");
|
||||
|
||||
return __probe_event_show_format(s, tp, "%lx:", "ip");
|
||||
|
|
@ -1092,7 +1095,6 @@ static int kretprobe_event_show_format(struct ftrace_event_call *call,
|
|||
{
|
||||
struct kretprobe_trace_entry field __attribute__((unused));
|
||||
int ret, i;
|
||||
char buf[8];
|
||||
struct trace_probe *tp = (struct trace_probe *)call->data;
|
||||
|
||||
SHOW_FIELD(unsigned long, func, "func");
|
||||
|
|
@ -1100,10 +1102,8 @@ static int kretprobe_event_show_format(struct ftrace_event_call *call,
|
|||
SHOW_FIELD(int, nargs, "nargs");
|
||||
|
||||
/* Show fields */
|
||||
for (i = 0; i < tp->nr_args; i++) {
|
||||
sprintf(buf, "arg%d", i);
|
||||
SHOW_FIELD(unsigned long, args[i], buf);
|
||||
}
|
||||
for (i = 0; i < tp->nr_args; i++)
|
||||
SHOW_FIELD(unsigned long, args[i], tp->args[i].name);
|
||||
trace_seq_puts(s, "\n");
|
||||
|
||||
return __probe_event_show_format(s, tp, "%lx <- %lx:",
|
||||
|
|
@ -1140,7 +1140,7 @@ static __kprobes int kprobe_profile_func(struct kprobe *kp,
|
|||
entry->nargs = tp->nr_args;
|
||||
entry->ip = (unsigned long)kp->addr;
|
||||
for (i = 0; i < tp->nr_args; i++)
|
||||
entry->args[i] = call_fetch(&tp->args[i], regs);
|
||||
entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
|
||||
perf_tpcounter_event(call->id, entry->ip, 1, entry, size);
|
||||
} while (0);
|
||||
return 0;
|
||||
|
|
@ -1175,7 +1175,7 @@ static __kprobes int kretprobe_profile_func(struct kretprobe_instance *ri,
|
|||
entry->func = (unsigned long)tp->rp.kp.addr;
|
||||
entry->ret_ip = (unsigned long)ri->ret_addr;
|
||||
for (i = 0; i < tp->nr_args; i++)
|
||||
entry->args[i] = call_fetch(&tp->args[i], regs);
|
||||
entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
|
||||
perf_tpcounter_event(call->id, entry->ret_ip, 1, entry, size);
|
||||
} while (0);
|
||||
return 0;
|
||||
|
|
|
|||
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Ссылка в новой задаче