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tracing: add support for userspace stacktraces in tracing/iter_ctrl

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Impact: add new (default-off) tracing visualization feature

Usage example:

 mount -t debugfs nodev /sys/kernel/debug
 cd /sys/kernel/debug/tracing
 echo userstacktrace >iter_ctrl
 echo sched_switch >current_tracer
 echo 1 >tracing_enabled
 .... run application ...
 echo 0 >tracing_enabled

Then read one of 'trace','latency_trace','trace_pipe'.

To get the best output you can compile your userspace programs with
frame pointers (at least glibc + the app you are tracing).

Signed-off-by: Török Edwin <edwintorok@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Török Edwin
2008-11-22 13:28:47 +02:00
committed by Ingo Molnar
parent a0a70c735e
commit 02b67518e2
5 changed files with 171 additions and 1 deletions
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9
kernel/trace/trace.h
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@@ -26,6 +26,7 @@ enum trace_type {
TRACE_BOOT_CALL,
TRACE_BOOT_RET,
TRACE_FN_RET,
TRACE_USER_STACK,
__TRACE_LAST_TYPE
};
@@ -42,6 +43,7 @@ struct trace_entry {
unsigned char flags;
unsigned char preempt_count;
int pid;
int tgid;
};
/*
@@ -99,6 +101,11 @@ struct stack_entry {
unsigned long caller[FTRACE_STACK_ENTRIES];
};
struct userstack_entry {
struct trace_entry ent;
unsigned long caller[FTRACE_STACK_ENTRIES];
};
/*
* ftrace_printk entry:
*/
@@ -240,6 +247,7 @@ extern void __ftrace_bad_type(void);
IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
IF_ASSIGN(var, ent, struct special_entry, 0); \
IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
@@ -500,6 +508,7 @@ enum trace_iterator_flags {
TRACE_ITER_PREEMPTONLY = 0x800,
TRACE_ITER_BRANCH = 0x1000,
TRACE_ITER_ANNOTATE = 0x2000,
TRACE_ITER_USERSTACKTRACE = 0x4000
};
/*