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Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  tracing: Fix sign fields in ftrace_define_fields_##call()
  tracing/syscalls: Fix typo in SYSCALL_DEFINE0
  tracing/kprobe: Show sign of fields in trace_kprobe format files
  ksym_tracer: Remove trace_stat
  ksym_tracer: Fix race when incrementing count
  ksym_tracer: Fix to allow writing newline to ksym_trace_filter
  ksym_tracer: Fix to make the tracer work
  tracing: Kconfig spelling fixes and cleanups
  tracing: Fix setting tracer specific options
  Documentation: Update ftrace-design.txt
  Documentation: Update tracepoint-analysis.txt
  Documentation: Update mmiotrace.txt
This commit is contained in:
Linus Torvalds
2009-12-31 11:52:01 -08:00
parent 4e58fb7305 fb7ae981cb
commit b21c070403
11 changed files with 185 additions and 203 deletions
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10
kernel/hw_breakpoint.c
View File

@@ -40,6 +40,7 @@
#include <linux/percpu.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/hw_breakpoint.h>
@@ -388,7 +389,8 @@ register_wide_hw_breakpoint(struct perf_event_attr *attr,
if (!cpu_events)
return ERR_PTR(-ENOMEM);
for_each_possible_cpu(cpu) {
get_online_cpus();
for_each_online_cpu(cpu) {
pevent = per_cpu_ptr(cpu_events, cpu);
bp = perf_event_create_kernel_counter(attr, cpu, -1, triggered);
@@ -399,18 +401,20 @@ register_wide_hw_breakpoint(struct perf_event_attr *attr,
goto fail;
}
}
put_online_cpus();
return cpu_events;
fail:
for_each_possible_cpu(cpu) {
for_each_online_cpu(cpu) {
pevent = per_cpu_ptr(cpu_events, cpu);
if (IS_ERR(*pevent))
break;
unregister_hw_breakpoint(*pevent);
}
put_online_cpus();
free_percpu(cpu_events);
/* return the error if any */
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(register_wide_hw_breakpoint);

112
kernel/trace/Kconfig
View File

@@ -12,17 +12,17 @@ config NOP_TRACER
config HAVE_FTRACE_NMI_ENTER
bool
help
See Documentation/trace/ftrace-implementation.txt
See Documentation/trace/ftrace-design.txt
config HAVE_FUNCTION_TRACER
bool
help
See Documentation/trace/ftrace-implementation.txt
See Documentation/trace/ftrace-design.txt
config HAVE_FUNCTION_GRAPH_TRACER
bool
help
See Documentation/trace/ftrace-implementation.txt
See Documentation/trace/ftrace-design.txt
config HAVE_FUNCTION_GRAPH_FP_TEST
bool
@@ -34,17 +34,17 @@ config HAVE_FUNCTION_GRAPH_FP_TEST
config HAVE_FUNCTION_TRACE_MCOUNT_TEST
bool
help
See Documentation/trace/ftrace-implementation.txt
See Documentation/trace/ftrace-design.txt
config HAVE_DYNAMIC_FTRACE
bool
help
See Documentation/trace/ftrace-implementation.txt
See Documentation/trace/ftrace-design.txt
config HAVE_FTRACE_MCOUNT_RECORD
bool
help
See Documentation/trace/ftrace-implementation.txt
See Documentation/trace/ftrace-design.txt
config HAVE_HW_BRANCH_TRACER
bool
@@ -52,7 +52,7 @@ config HAVE_HW_BRANCH_TRACER
config HAVE_SYSCALL_TRACEPOINTS
bool
help
See Documentation/trace/ftrace-implementation.txt
See Documentation/trace/ftrace-design.txt
config TRACER_MAX_TRACE
bool
@@ -83,7 +83,7 @@ config RING_BUFFER_ALLOW_SWAP
# This allows those options to appear when no other tracer is selected. But the
# options do not appear when something else selects it. We need the two options
# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the
# hidding of the automatic options.
# hiding of the automatic options.
config TRACING
bool
@@ -119,7 +119,7 @@ menuconfig FTRACE
bool "Tracers"
default y if DEBUG_KERNEL
help
Enable the kernel tracing infrastructure.
Enable the kernel tracing infrastructure.
if FTRACE
@@ -133,7 +133,7 @@ config FUNCTION_TRACER
help
Enable the kernel to trace every kernel function. This is done
by using a compiler feature to insert a small, 5-byte No-Operation
instruction to the beginning of every kernel function, which NOP
instruction at the beginning of every kernel function, which NOP
sequence is then dynamically patched into a tracer call when
tracing is enabled by the administrator. If it's runtime disabled
(the bootup default), then the overhead of the instructions is very
@@ -150,7 +150,7 @@ config FUNCTION_GRAPH_TRACER
and its entry.
Its first purpose is to trace the duration of functions and
draw a call graph for each thread with some information like
the return value. This is done by setting the current return
the return value. This is done by setting the current return
address on the current task structure into a stack of calls.
@@ -173,7 +173,7 @@ config IRQSOFF_TRACER
echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
(Note that kernel size and overhead increases with this option
(Note that kernel size and overhead increase with this option
enabled. This option and the preempt-off timing option can be
used together or separately.)
@@ -186,7 +186,7 @@ config PREEMPT_TRACER
select TRACER_MAX_TRACE
select RING_BUFFER_ALLOW_SWAP
help
This option measures the time spent in preemption off critical
This option measures the time spent in preemption-off critical
sections, with microsecond accuracy.
The default measurement method is a maximum search, which is
@@ -195,7 +195,7 @@ config PREEMPT_TRACER
echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
(Note that kernel size and overhead increases with this option
(Note that kernel size and overhead increase with this option
enabled. This option and the irqs-off timing option can be
used together or separately.)
@@ -222,7 +222,7 @@ config ENABLE_DEFAULT_TRACERS
depends on !GENERIC_TRACER
select TRACING
help
This tracer hooks to various trace points in the kernel
This tracer hooks to various trace points in the kernel,
allowing the user to pick and choose which trace point they
want to trace. It also includes the sched_switch tracer plugin.
@@ -265,19 +265,19 @@ choice
The likely/unlikely profiler only looks at the conditions that
are annotated with a likely or unlikely macro.
The "all branch" profiler will profile every if statement in the
The "all branch" profiler will profile every if-statement in the
kernel. This profiler will also enable the likely/unlikely
profiler as well.
profiler.
Either of the above profilers add a bit of overhead to the system.
If unsure choose "No branch profiling".
Either of the above profilers adds a bit of overhead to the system.
If unsure, choose "No branch profiling".
config BRANCH_PROFILE_NONE
bool "No branch profiling"
help
No branch profiling. Branch profiling adds a bit of overhead.
Only enable it if you want to analyse the branching behavior.
Otherwise keep it disabled.
No branch profiling. Branch profiling adds a bit of overhead.
Only enable it if you want to analyse the branching behavior.
Otherwise keep it disabled.
config PROFILE_ANNOTATED_BRANCHES
bool "Trace likely/unlikely profiler"
@@ -288,7 +288,7 @@ config PROFILE_ANNOTATED_BRANCHES
/sys/kernel/debug/tracing/profile_annotated_branch
Note: this will add a significant overhead, only turn this
Note: this will add a significant overhead; only turn this
on if you need to profile the system's use of these macros.
config PROFILE_ALL_BRANCHES
@@ -305,7 +305,7 @@ config PROFILE_ALL_BRANCHES
This configuration, when enabled, will impose a great overhead
on the system. This should only be enabled when the system
is to be analyzed
is to be analyzed in much detail.
endchoice
config TRACING_BRANCHES
@@ -335,7 +335,7 @@ config POWER_TRACER
depends on X86
select GENERIC_TRACER
help
This tracer helps developers to analyze and optimize the kernels
This tracer helps developers to analyze and optimize the kernel's
power management decisions, specifically the C-state and P-state
behavior.
@@ -391,14 +391,14 @@ config HW_BRANCH_TRACER
select GENERIC_TRACER
help
This tracer records all branches on the system in a circular
buffer giving access to the last N branches for each cpu.
buffer, giving access to the last N branches for each cpu.
config KMEMTRACE
bool "Trace SLAB allocations"
select GENERIC_TRACER
help
kmemtrace provides tracing for slab allocator functions, such as
kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
data is then fed to the userspace application in order to analyse
allocation hotspots, internal fragmentation and so on, making it
possible to see how well an allocator performs, as well as debug
@@ -417,15 +417,15 @@ config WORKQUEUE_TRACER
bool "Trace workqueues"
select GENERIC_TRACER
help
The workqueue tracer provides some statistical informations
The workqueue tracer provides some statistical information
about each cpu workqueue thread such as the number of the
works inserted and executed since their creation. It can help
to evaluate the amount of work each of them have to perform.
to evaluate the amount of work each of them has to perform.
For example it can help a developer to decide whether he should
choose a per cpu workqueue instead of a singlethreaded one.
choose a per-cpu workqueue instead of a singlethreaded one.
config BLK_DEV_IO_TRACE
bool "Support for tracing block io actions"
bool "Support for tracing block IO actions"
depends on SYSFS
depends on BLOCK
select RELAY
@@ -456,15 +456,15 @@ config KPROBE_EVENT
select TRACING
default y
help
This allows the user to add tracing events (similar to tracepoints) on the fly
via the ftrace interface. See Documentation/trace/kprobetrace.txt
for more details.
This allows the user to add tracing events (similar to tracepoints)
on the fly via the ftrace interface. See
Documentation/trace/kprobetrace.txt for more details.
Those events can be inserted wherever kprobes can probe, and record
various register and memory values.
This option is also required by perf-probe subcommand of perf tools. If
you want to use perf tools, this option is strongly recommended.
This option is also required by perf-probe subcommand of perf tools.
If you want to use perf tools, this option is strongly recommended.
config DYNAMIC_FTRACE
bool "enable/disable ftrace tracepoints dynamically"
@@ -472,32 +472,32 @@ config DYNAMIC_FTRACE
depends on HAVE_DYNAMIC_FTRACE
default y
help
This option will modify all the calls to ftrace dynamically
(will patch them out of the binary image and replaces them
with a No-Op instruction) as they are called. A table is
created to dynamically enable them again.
This option will modify all the calls to ftrace dynamically
(will patch them out of the binary image and replace them
with a No-Op instruction) as they are called. A table is
created to dynamically enable them again.
This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise
has native performance as long as no tracing is active.
This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but
otherwise has native performance as long as no tracing is active.
The changes to the code are done by a kernel thread that
wakes up once a second and checks to see if any ftrace calls
were made. If so, it runs stop_machine (stops all CPUS)
and modifies the code to jump over the call to ftrace.
The changes to the code are done by a kernel thread that
wakes up once a second and checks to see if any ftrace calls
were made. If so, it runs stop_machine (stops all CPUS)
and modifies the code to jump over the call to ftrace.
config FUNCTION_PROFILER
bool "Kernel function profiler"
depends on FUNCTION_TRACER
default n
help
This option enables the kernel function profiler. A file is created
in debugfs called function_profile_enabled which defaults to zero.
When a 1 is echoed into this file profiling begins, and when a
zero is entered, profiling stops. A file in the trace_stats
directory called functions, that show the list of functions that
have been hit and their counters.
This option enables the kernel function profiler. A file is created
in debugfs called function_profile_enabled which defaults to zero.
When a 1 is echoed into this file profiling begins, and when a
zero is entered, profiling stops. A "functions" file is created in
the trace_stats directory; this file shows the list of functions that
have been hit and their counters.
If in doubt, say N
If in doubt, say N.
config FTRACE_MCOUNT_RECORD
def_bool y
@@ -556,8 +556,8 @@ config RING_BUFFER_BENCHMARK
tristate "Ring buffer benchmark stress tester"
depends on RING_BUFFER
help
This option creates a test to stress the ring buffer and bench mark it.
It creates its own ring buffer such that it will not interfer with
This option creates a test to stress the ring buffer and benchmark it.
It creates its own ring buffer such that it will not interfere with
any other users of the ring buffer (such as ftrace). It then creates
a producer and consumer that will run for 10 seconds and sleep for
10 seconds. Each interval it will print out the number of events
@@ -566,7 +566,7 @@ config RING_BUFFER_BENCHMARK
It does not disable interrupts or raise its priority, so it may be
affected by processes that are running.
If unsure, say N
If unsure, say N.
endif # FTRACE

2
kernel/trace/trace.c
View File

@@ -3949,7 +3949,7 @@ trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt,
if (!!(topt->flags->val & topt->opt->bit) != val) {
mutex_lock(&trace_types_lock);
ret = __set_tracer_option(current_trace, topt->flags,
topt->opt, val);
topt->opt, !val);
mutex_unlock(&trace_types_lock);
if (ret)
return ret;

7
kernel/trace/trace_export.c
View File

@@ -158,7 +158,8 @@ ftrace_format_##name(struct ftrace_event_call *unused, \
BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
ret = trace_define_field(event_call, #type "[" #len "]", #item, \
offsetof(typeof(field), item), \
sizeof(field.item), 0, FILTER_OTHER); \
sizeof(field.item), \
is_signed_type(type), FILTER_OTHER); \
if (ret) \
return ret;
@@ -168,8 +169,8 @@ ftrace_format_##name(struct ftrace_event_call *unused, \
ret = trace_define_field(event_call, #type "[" #len "]", #item, \
offsetof(typeof(field), \
container.item), \
sizeof(field.container.item), 0, \
FILTER_OTHER); \
sizeof(field.container.item), \
is_signed_type(type), FILTER_OTHER); \
if (ret) \
return ret;

7
kernel/trace/trace_kprobe.c
View File

@@ -1201,10 +1201,11 @@ static int __probe_event_show_format(struct trace_seq *s,
#undef SHOW_FIELD
#define SHOW_FIELD(type, item, name) \
do { \
ret = trace_seq_printf(s, "\tfield: " #type " %s;\t" \
"offset:%u;\tsize:%u;\n", name, \
ret = trace_seq_printf(s, "\tfield:" #type " %s;\t" \
"offset:%u;\tsize:%u;\tsigned:%d;\n", name,\
(unsigned int)offsetof(typeof(field), item),\
(unsigned int)sizeof(type)); \
(unsigned int)sizeof(type), \
is_signed_type(type)); \
if (!ret) \
return 0; \
} while (0)

152
kernel/trace/trace_ksym.c
View File

@@ -26,12 +26,13 @@
#include <linux/fs.h>
#include "trace_output.h"
#include "trace_stat.h"
#include "trace.h"
#include <linux/hw_breakpoint.h>
#include <asm/hw_breakpoint.h>
#include <asm/atomic.h>
/*
* For now, let us restrict the no. of symbols traced simultaneously to number
* of available hardware breakpoint registers.
@@ -44,7 +45,7 @@ struct trace_ksym {
struct perf_event **ksym_hbp;
struct perf_event_attr attr;
#ifdef CONFIG_PROFILE_KSYM_TRACER
unsigned long counter;
atomic64_t counter;
#endif
struct hlist_node ksym_hlist;
};
@@ -69,9 +70,8 @@ void ksym_collect_stats(unsigned long hbp_hit_addr)
rcu_read_lock();
hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
if ((entry->attr.bp_addr == hbp_hit_addr) &&
(entry->counter <= MAX_UL_INT)) {
entry->counter++;
if (entry->attr.bp_addr == hbp_hit_addr) {
atomic64_inc(&entry->counter);
break;
}
}
@@ -197,7 +197,6 @@ int process_new_ksym_entry(char *ksymname, int op, unsigned long addr)
entry->attr.bp_addr = addr;
entry->attr.bp_len = HW_BREAKPOINT_LEN_4;
ret = -EAGAIN;
entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr,
ksym_hbp_handler);
@@ -300,8 +299,8 @@ static ssize_t ksym_trace_filter_write(struct file *file,
* 2: echo 0 > ksym_trace_filter
* 3: echo "*:---" > ksym_trace_filter
*/
if (!buf[0] || !strcmp(buf, "0") ||
!strcmp(buf, "*:---")) {
if (!input_string[0] || !strcmp(input_string, "0") ||
!strcmp(input_string, "*:---")) {
__ksym_trace_reset();
ret = 0;
goto out;
@@ -444,102 +443,77 @@ struct tracer ksym_tracer __read_mostly =
.print_line = ksym_trace_output
};
__init static int init_ksym_trace(void)
{
struct dentry *d_tracer;
struct dentry *entry;
d_tracer = tracing_init_dentry();
ksym_filter_entry_count = 0;
entry = debugfs_create_file("ksym_trace_filter", 0644, d_tracer,
NULL, &ksym_tracing_fops);
if (!entry)
pr_warning("Could not create debugfs "
"'ksym_trace_filter' file\n");
return register_tracer(&ksym_tracer);
}
device_initcall(init_ksym_trace);
#ifdef CONFIG_PROFILE_KSYM_TRACER
static int ksym_tracer_stat_headers(struct seq_file *m)
static int ksym_profile_show(struct seq_file *m, void *v)
{
seq_puts(m, " Access Type ");
seq_puts(m, " Symbol Counter\n");
seq_puts(m, " ----------- ");
seq_puts(m, " ------ -------\n");
return 0;
}
static int ksym_tracer_stat_show(struct seq_file *m, void *v)
{
struct hlist_node *stat = v;
struct hlist_node *node;
struct trace_ksym *entry;
int access_type = 0;
char fn_name[KSYM_NAME_LEN];
entry = hlist_entry(stat, struct trace_ksym, ksym_hlist);
seq_puts(m, " Access Type ");
seq_puts(m, " Symbol Counter\n");
seq_puts(m, " ----------- ");
seq_puts(m, " ------ -------\n");
access_type = entry->attr.bp_type;
rcu_read_lock();
hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
switch (access_type) {
case HW_BREAKPOINT_R:
seq_puts(m, " R ");
break;
case HW_BREAKPOINT_W:
seq_puts(m, " W ");
break;
case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
seq_puts(m, " RW ");
break;
default:
seq_puts(m, " NA ");
access_type = entry->attr.bp_type;
switch (access_type) {
case HW_BREAKPOINT_R:
seq_puts(m, " R ");
break;
case HW_BREAKPOINT_W:
seq_puts(m, " W ");
break;
case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
seq_puts(m, " RW ");
break;
default:
seq_puts(m, " NA ");
}
if (lookup_symbol_name(entry->attr.bp_addr, fn_name) >= 0)
seq_printf(m, " %-36s", fn_name);
else
seq_printf(m, " %-36s", "<NA>");
seq_printf(m, " %15llu\n",
(unsigned long long)atomic64_read(&entry->counter));
}
if (lookup_symbol_name(entry->attr.bp_addr, fn_name) >= 0)
seq_printf(m, " %-36s", fn_name);
else
seq_printf(m, " %-36s", "<NA>");
seq_printf(m, " %15lu\n", entry->counter);
rcu_read_unlock();
return 0;
}
static void *ksym_tracer_stat_start(struct tracer_stat *trace)
static int ksym_profile_open(struct inode *node, struct file *file)
{
return ksym_filter_head.first;
return single_open(file, ksym_profile_show, NULL);
}
static void *
ksym_tracer_stat_next(void *v, int idx)
{
struct hlist_node *stat = v;
return stat->next;
}
static struct tracer_stat ksym_tracer_stats = {
.name = "ksym_tracer",
.stat_start = ksym_tracer_stat_start,
.stat_next = ksym_tracer_stat_next,
.stat_headers = ksym_tracer_stat_headers,
.stat_show = ksym_tracer_stat_show
static const struct file_operations ksym_profile_fops = {
.open = ksym_profile_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
__init static int ksym_tracer_stat_init(void)
{
int ret;
ret = register_stat_tracer(&ksym_tracer_stats);
if (ret) {
printk(KERN_WARNING "Warning: could not register "
"ksym tracer stats\n");
return 1;
}
return 0;
}
fs_initcall(ksym_tracer_stat_init);
#endif /* CONFIG_PROFILE_KSYM_TRACER */
__init static int init_ksym_trace(void)
{
struct dentry *d_tracer;
d_tracer = tracing_init_dentry();
trace_create_file("ksym_trace_filter", 0644, d_tracer,
NULL, &ksym_tracing_fops);
#ifdef CONFIG_PROFILE_KSYM_TRACER
trace_create_file("ksym_profile", 0444, d_tracer,
NULL, &ksym_profile_fops);
#endif
return register_tracer(&ksym_tracer);
}
device_initcall(init_ksym_trace);