[kgtp] r922 committed - Add $current_task_pid
- From: kgtp@xxxxxxxxxxxxxx
- To: kgtp@xxxxxxxxxxxxx
- Date: Tue, 21 Feb 2012 04:07:43 +0000
Revision: 922
Author: teawater
Date: Mon Feb 20 20:06:54 2012
Log: Add $current_task_pid
http://code.google.com/p/kgtp/source/detail?r=922
Modified:
/trunk/gtp.c
/trunk/gtp.txt
/trunk/gtp_for_review.patch
/wiki/HOWTO.wiki
=======================================
--- /trunk/gtp.c Fri Feb 17 06:49:57 2012
+++ /trunk/gtp.c Mon Feb 20 20:06:54 2012
@@ -432,6 +432,7 @@
GTP_VAR_SOFTIRQ_COUNT_ID,
GTP_VAR_IRQ_COUNT_ID,
GTP_VAR_PIPE_TRACE_ID,
+ GTP_VAR_CURRENT_TASK_PID_ID,
GTP_VAR_SPECIAL_MAX = GTP_VAR_PIPE_TRACE_ID,
};
@@ -464,6 +465,15 @@
#undef PREV_VAR
#define PREV_VAR (>p_var_current_task)
+static struct gtp_var gtp_var_current_task_pid = {
+ .next = PREV_VAR,
+ .num = GTP_VAR_CURRENT_TASK_PID_ID,
+ .src = "0:1:63757272656e745f7461736b5f706964",
+ .per_cpu = NULL,
+};
+#undef PREV_VAR
+#define PREV_VAR (>p_var_current_task_pid)
+
static struct gtp_var gtp_var_current_thread_info = {
.next = PREV_VAR,
.num = GTP_VAR_CURRENT_THREAD_INFO_ID,
@@ -2407,6 +2417,12 @@
else
return (uint64_t)(CORE_ADDR)get_current();
break;
+ case GTP_VAR_CURRENT_TASK_PID_ID:
+ if (gts->ri)
+ return (uint64_t)(CORE_ADDR)gts->ri->task->pid;
+ else
+ return (uint64_t)(CORE_ADDR)get_current()->pid;
+ break;
case GTP_VAR_CURRENT_THREAD_INFO_ID:
return (uint64_t)(CORE_ADDR)current_thread_info();
break;
=======================================
--- /trunk/gtp.txt Fri Feb 17 07:11:56 2012
+++ /trunk/gtp.txt Mon Feb 20 20:06:54 2012
@@ -2,7 +2,7 @@
=========================================
By Hui Zhu <teawater@xxxxxxxxx>
https://code.google.com/p/kgtp/wiki/HOWTO
- 2012-02-17
+ 2012-02-21
Table of contents
-----------------
@@ -34,7 +34,7 @@
How to use trace state variables
Simple trace state variables
Per_cpu trace state variables
- Special trace state variables $current_task,
+ Special trace state variables $current_task, $current_task_pid,
$current_thread_info, $cpu_id, $dump_stack, $printk_level,
$printk_format, $printk_tmp, $clock, $rdtsc, $hardirq_count,
$softirq_count and $irq_count
@@ -635,9 +635,9 @@
of each CPU.
-Special trace state variables $current_task, $current_thread_info, $cpu_id,
-$dump_stack, $printk_level, $printk_format, $printk_tmp, $clock, $rdtsc,
-$hardirq_count, $softirq_count and $irq_count
+Special trace state variables $current_task, $current_task_pid,
+$current_thread_info, $cpu_id, $dump_stack, $printk_level, $printk_format,
+$printk_tmp, $clock, $rdtsc, $hardirq_count, $softirq_count and $irq_count
---------------------------------------------------------------------------
KGTP special trace state variables $current_task, $current_thread_info,
@@ -646,6 +646,8 @@
or actions.
Access $current_task in tracepoint condition and action will get that
returns
of get_current().
+Access $current_task_pid in tracepoint condition and action will get that
+returns of get_current()->pid.
Access $current_thread_info in tracepoint condition and action will get
that
returns of current_thread_info().
Access $cpu_id in tracepoint condition and action will get that returns of
=======================================
--- /trunk/gtp_for_review.patch Sat Feb 18 19:09:33 2012
+++ /trunk/gtp_for_review.patch Mon Feb 20 20:06:54 2012
@@ -1,7 +1,5 @@
---
-
----
- Documentation/trace/gtp.txt | 1517 +++++
+ Documentation/trace/gtp.txt | 1519 +++++
Documentation/trace/gtp_quickstart.txt | 250
arch/arm/include/asm/gtp.h | 13
arch/mips/include/asm/gtp.h | 18
@@ -10,20 +8,20 @@
kernel/events/core.c | 14
lib/Kconfig.debug | 10
lib/Makefile | 4
- lib/gtp.c | 8452
+++++++++++++++++++++++++++++++++
+ lib/gtp.c | 8468
+++++++++++++++++++++++++++++++++
lib/gtp_rb.c | 495 +
scripts/gtp/getgtprsp.pl | 137
scripts/gtp/getmod.py | 132
- 13 files changed, 11061 insertions(+), 2 deletions(-)
+ 13 files changed, 11079 insertions(+), 2 deletions(-)
--- /dev/null
+++ b/Documentation/trace/gtp.txt
-@@ -0,0 +1,1517 @@
+@@ -0,0 +1,1519 @@
+ Linux Kernel GDB tracepoint module (KGTP)
+ =========================================
+ By Hui Zhu <teawater@xxxxxxxxx>
+ https://code.google.com/p/kgtp/wiki/HOWTO
-+ 2012-02-17
++ 2012-02-21
+
+Table of contents
+-----------------
@@ -55,7 +53,7 @@
+ How to use trace state variables
+ Simple trace state variables
+ Per_cpu trace state variables
-+ Special trace state variables $current_task,
++ Special trace state variables $current_task, $current_task_pid,
+ $current_thread_info, $cpu_id, $dump_stack, $printk_level,
+ $printk_format, $printk_tmp, $clock, $rdtsc, $hardirq_count,
+ $softirq_count and $irq_count
@@ -656,9 +654,9 @@
+of each CPU.
+
+
-+Special trace state variables $current_task, $current_thread_info,
$cpu_id,
-+$dump_stack, $printk_level, $printk_format, $printk_tmp, $clock, $rdtsc,
-+$hardirq_count, $softirq_count and $irq_count
++Special trace state variables $current_task, $current_task_pid,
++$current_thread_info, $cpu_id, $dump_stack, $printk_level, $printk_format,
++$printk_tmp, $clock, $rdtsc, $hardirq_count, $softirq_count and $irq_count
+---------------------------------------------------------------------------
+
+KGTP special trace state variables $current_task, $current_thread_info,
@@ -667,6 +665,8 @@
+or actions.
+Access $current_task in tracepoint condition and action will get that
returns
+of get_current().
++Access $current_task_pid in tracepoint condition and action will get that
++returns of get_current()->pid.
+Access $current_thread_info in tracepoint condition and action will get
that
+returns of current_thread_info().
+Access $cpu_id in tracepoint condition and action will get that returns of
@@ -1951,7 +1951,7 @@
+gtp.o: gtp_rb.c
--- /dev/null
+++ b/lib/gtp.c
-@@ -0,0 +1,8452 @@
+@@ -0,0 +1,8468 @@
+/*
+ * Kernel GDB tracepoint module.
+ *
@@ -2232,6 +2232,7 @@
+ GTP_VAR_SOFTIRQ_COUNT_ID,
+ GTP_VAR_IRQ_COUNT_ID,
+ GTP_VAR_PIPE_TRACE_ID,
++ GTP_VAR_CURRENT_TASK_PID_ID,
+ GTP_VAR_SPECIAL_MAX = GTP_VAR_PIPE_TRACE_ID,
+};
+
@@ -2264,6 +2265,15 @@
+#undef PREV_VAR
+#define PREV_VAR (>p_var_current_task)
+
++static struct gtp_var gtp_var_current_task_pid = {
++ .next = PREV_VAR,
++ .num = GTP_VAR_CURRENT_TASK_PID_ID,
++ .src = "0:1:63757272656e745f7461736b5f706964",
++ .per_cpu = NULL,
++};
++#undef PREV_VAR
++#define PREV_VAR (>p_var_current_task_pid)
++
+static struct gtp_var gtp_var_current_thread_info = {
+ .next = PREV_VAR,
+ .num = GTP_VAR_CURRENT_THREAD_INFO_ID,
@@ -3883,6 +3893,12 @@
+ else
+ return (uint64_t)(CORE_ADDR)get_current();
+ break;
++ case GTP_VAR_CURRENT_TASK_PID_ID:
++ if (gts->ri)
++ return (uint64_t)(CORE_ADDR)gts->ri->task->pid;
++ else
++ return (uint64_t)(CORE_ADDR)get_current()->pid;
++ break;
+ case GTP_VAR_CURRENT_THREAD_INFO_ID:
+ return (uint64_t)(CORE_ADDR)current_thread_info();
+ break;
=======================================
--- /wiki/HOWTO.wiki Fri Feb 17 07:11:56 2012
+++ /wiki/HOWTO.wiki Mon Feb 20 20:06:54 2012
@@ -1,5 +1,5 @@
#labels Phase-QA,Phase-Deploy
-Update in 2012-02-17
+Update in 2012-02-21
<wiki:toc max_depth="3" />
= What is KGTP =
*KGTP* is a *realtime* and *lightweight* Linux Kernel *debugger* and
*tracer*.<br><br>
@@ -386,11 +386,12 @@
}}}
These GDB commands define a tracepoint that count the times that call
vfs_read of each CPU.
-=== Special trace state variables $current_task, $current_thread_info,
$cpu_id, $dump_stack, $printk_level, $printk_format, $printk_tmp ,$clock,
$hardirq_count, $softirq_count and $irq_count ===
+=== Special trace state variables $current_task, $current_task_pid,
$current_thread_info, $cpu_id, $dump_stack, $printk_level, $printk_format,
$printk_tmp ,$clock, $hardirq_count, $softirq_count and $irq_count ===
KGTP special trace state variables $current_task, $current_thread_info,
$cpu_id and $clock can very easy to access to some special value.
You can see them when GDB connects to the KGTP.
You can use them in tracepoint conditions or actions. <br>
Access $current_task in tracepoint condition and action will get that
returns of get_current().<br>
+Access $current_task_pid in tracepoint condition and action will get that
returns of get_current()->pid.<br>
Access $current_thread_info in tracepoint condition and action will get
that returns of current_thread_info().<br>
Access $cpu_id in tracepoint condition and action will get that returns of
smp_processor_id().<br>
Access $clock in tracepoint condition and action will get that returns of
local_clock() that return the timestamp in nanoseconds.<br>
Other related posts:
- » [kgtp] r922 committed - Add $current_task_pid - kgtp
