From: Masami Hiramatsu <mhiramat@redhat.com>
To: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
lkml<linux-kernel@vger.kernel.org>
Cc: systemtap <systemtap@sources.redhat.com>,
kvm <kvm@vger.kernel.org>,
DLE <dle-develop@lists.sourceforge.net>,
"Masami Hiramatsu" <mhiramat@redhat.com>,
"Ananth N Mavinakayanahalli" <ananth@in.ibm.com>,
"Avi Kivity" <avi@redhat.com>, "Andi Kleen" <ak@linux.intel.com>,
"Christoph Hellwig" <hch@infradead.org>,
"Frank Ch. Eigler" <fche@redhat.com>,
"Frederic Weisbecker" <fweisbec@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>, "Ingo Molnar" <mingo@elte.hu>,
"Jason Baron" <jbaron@redhat.com>,
"Jim Keniston" <jkenisto@us.ibm.com>,
"K.Prasad" <prasad@linux.vnet.ibm.com>,
"Lai Jiangshan" <laijs@cn.fujitsu.com>,
"Li Zefan" <lizf@cn.fujitsu.com>,
PrzemysławPawełczyk <przemyslaw@pawelczyk.it>,
"Roland McGrath" <roland@redhat.com>,
"Sam Ravnborg" <sam@ravnborg.org>,
"Srikar Dronamraju" <srikar@linux.vnet.ibm.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Tom Zanussi" <tzanussi@gmail.com>,
"Vegard Nossum" <vegard.nossum@gmail.com>
Subject: [PATCH -tip v14 12/12] tracing: Add kprobes event profiling interface
Date: Thu, 13 Aug 2009 20:33:00 -0000 [thread overview]
Message-ID: <20090813203541.31965.8452.stgit@localhost.localdomain> (raw)
In-Reply-To: <20090813203403.31965.20973.stgit@localhost.localdomain>
Add profiling interaces for each kprobes event. This interface provides
how many times each probe hit or missed.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Avi Kivity <avi@redhat.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: Jim Keniston <jkenisto@us.ibm.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: PrzemysÅaw PaweÅczyk <przemyslaw@pawelczyk.it>
Cc: Roland McGrath <roland@redhat.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
---
Documentation/trace/kprobetrace.txt | 8 +++++++
kernel/trace/trace_kprobe.c | 43 +++++++++++++++++++++++++++++++++++
2 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt
index 5e59e85..3de7517 100644
--- a/Documentation/trace/kprobetrace.txt
+++ b/Documentation/trace/kprobetrace.txt
@@ -70,6 +70,14 @@ filter:
names and field names for describing filters.
+Event Profiling
+---------------
+ You can check the total number of probe hits and probe miss-hits via
+/sys/kernel/debug/tracing/kprobe_profile.
+ The first column is event name, the second is the number of probe hits,
+the third is the number of probe miss-hits.
+
+
Usage examples
--------------
To add a probe as a new event, write a new definition to kprobe_events
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 0e8498e..0f5d0a6 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -184,6 +184,7 @@ struct trace_probe {
struct kprobe kp;
struct kretprobe rp;
};
+ unsigned long nhit;
const char *symbol; /* symbol name */
struct ftrace_event_call call;
struct trace_event event;
@@ -781,6 +782,37 @@ static const struct file_operations kprobe_events_ops = {
.write = probes_write,
};
+/* Probes profiling interfaces */
+static int probes_profile_seq_show(struct seq_file *m, void *v)
+{
+ struct trace_probe *tp = v;
+
+ seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit,
+ probe_is_return(tp) ? tp->rp.kp.nmissed : tp->kp.nmissed);
+
+ return 0;
+}
+
+static const struct seq_operations profile_seq_op = {
+ .start = probes_seq_start,
+ .next = probes_seq_next,
+ .stop = probes_seq_stop,
+ .show = probes_profile_seq_show
+};
+
+static int profile_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &profile_seq_op);
+}
+
+static const struct file_operations kprobe_profile_ops = {
+ .owner = THIS_MODULE,
+ .open = profile_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
/* Kprobe handler */
static __kprobes int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
{
@@ -791,6 +823,8 @@ static __kprobes int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
unsigned long irq_flags;
struct ftrace_event_call *call = &tp->call;
+ tp->nhit++;
+
local_save_flags(irq_flags);
pc = preempt_count();
@@ -1143,9 +1177,18 @@ static __init int init_kprobe_trace(void)
entry = debugfs_create_file("kprobe_events", 0644, d_tracer,
NULL, &kprobe_events_ops);
+ /* Event list interface */
if (!entry)
pr_warning("Could not create debugfs "
"'kprobe_events' entry\n");
+
+ /* Profile interface */
+ entry = debugfs_create_file("kprobe_profile", 0444, d_tracer,
+ NULL, &kprobe_profile_ops);
+
+ if (!entry)
+ pr_warning("Could not create debugfs "
+ "'kprobe_profile' entry\n");
return 0;
}
fs_initcall(init_kprobe_trace);
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
next prev parent reply other threads:[~2009-08-13 20:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-13 20:31 [PATCH -tip v14 00/12] tracing: kprobe-based event tracer and x86 instruction decoder Masami Hiramatsu
2009-08-13 20:31 ` [PATCH -tip v14 02/12] x86: x86 instruction decoder build-time selftest Masami Hiramatsu
2009-08-13 20:31 ` [PATCH -tip v14 05/12] x86: add pt_regs register and stack access APIs Masami Hiramatsu
2009-08-13 20:31 ` [PATCH -tip v14 04/12] kprobes: cleanup fix_riprel() using insn decoder on x86 Masami Hiramatsu
2009-08-13 20:31 ` [PATCH -tip v14 01/12] x86: instruction decoder API Masami Hiramatsu
[not found] ` <20090819234227.GJ4972@nowhere>
2009-08-20 14:38 ` Masami Hiramatsu
[not found] ` <20090820002113.GK4972@nowhere>
2009-08-20 15:00 ` Masami Hiramatsu
[not found] ` <20090820152549.GD6389@nowhere>
2009-08-20 16:12 ` Masami Hiramatsu
[not found] ` <20090820180737.GA6229@nowhere>
2009-08-20 18:58 ` Masami Hiramatsu
2009-08-13 20:31 ` [PATCH -tip v14 03/12] kprobes: checks probe address is instruction boudary on x86 Masami Hiramatsu
[not found] ` <20090818230340.GF5231@nowhere>
2009-08-18 23:16 ` Masami Hiramatsu
[not found] ` <20090818234341.GG5231@nowhere>
2009-08-19 0:18 ` Masami Hiramatsu
2009-08-13 20:32 ` [PATCH -tip v14 09/12] tracing: Kprobe-tracer supports more than 6 arguments Masami Hiramatsu
2009-08-13 20:32 ` [PATCH -tip v14 10/12] tracing: Generate names for each kprobe event automatically Masami Hiramatsu
2009-08-13 20:32 ` [PATCH -tip v14 08/12] tracing: add kprobe-based event tracer Masami Hiramatsu
2009-08-13 20:33 ` [PATCH -tip v14 11/12] tracing: Kprobe tracer assigns new event ids for each event Masami Hiramatsu
2009-08-13 20:33 ` Masami Hiramatsu [this message]
2009-08-13 20:47 ` [PATCH -tip v14 07/12] tracing: Introduce TRACE_FIELD_ZERO() macro Masami Hiramatsu
[not found] ` <20090819010903.GI5231@nowhere>
2009-08-19 2:18 ` Masami Hiramatsu
2009-08-13 20:47 ` [PATCH -tip v14 06/12] tracing: ftrace dynamic ftrace_event_call support Masami Hiramatsu
2009-08-13 20:54 ` [TOOL] kprobestest : Kprobe stress test tool Masami Hiramatsu
[not found] ` <20090820184331.GA6078@nowhere>
2009-08-20 19:42 ` Masami Hiramatsu
[not found] ` <20090821000108.GC6078@nowhere>
2009-08-21 0:56 ` Masami Hiramatsu
2009-08-21 19:40 ` [PATCH tracing/kprobes 1/4] x86: Fix x86 instruction decoder selftest to check only .text Masami Hiramatsu
2009-08-21 19:40 ` [PATCH tracing/kprobes 3/4] tracing/kprobes: Fix format typo in trace_kprobes Masami Hiramatsu
2009-08-21 19:40 ` [PATCH tracing/kprobes 2/4] x86: Check awk features before generating inat-tables.c Masami Hiramatsu
2009-08-21 19:41 ` [PATCH tracing/kprobes 4/4] tracing/kprobes: Change trace_arg to probe_arg Masami Hiramatsu
2009-08-13 20:56 ` [TOOL] c2kpe: C expression to kprobe event format converter Masami Hiramatsu
[not found] ` <20090830195041.GA6189@nowhere>
2009-08-31 4:12 ` Masami Hiramatsu
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