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Merge branches 'tracing/branch-tracer', 'tracing/ftrace', 'tracing/function-graph-tracer', 'tracing/markers', 'tracing/powerpc', 'tracing/stack-tracer' and 'tracing/tracepoints' into tracing/core

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This commit is contained in:
Ingo Molnar 2008-12-02 09:20:44 +01:00
commit 222658e08f
14 changed files with 383 additions and 193 deletions
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8
Documentation/ftrace.txt
View File

@ -1251,7 +1251,11 @@ These are the only wild cards which are supported.
<match>*<match> will not work.
# echo hrtimer_* > /debug/tracing/set_ftrace_filter
Note: It is better to use quotes to enclose the wild cards, otherwise
the shell may expand the parameters into names of files in the local
directory.
# echo 'hrtimer_*' > /debug/tracing/set_ftrace_filter
Produces:
@ -1306,7 +1310,7 @@ Again, now we want to append.
# echo sys_nanosleep > /debug/tracing/set_ftrace_filter
# cat /debug/tracing/set_ftrace_filter
sys_nanosleep
# echo hrtimer_* >> /debug/tracing/set_ftrace_filter
# echo 'hrtimer_*' >> /debug/tracing/set_ftrace_filter
# cat /debug/tracing/set_ftrace_filter
hrtimer_run_queues
hrtimer_run_pending

15
Documentation/markers.txt
View File

@ -51,11 +51,16 @@ to call) for the specific marker through marker_probe_register() and can be
activated by calling marker_arm(). Marker deactivation can be done by calling
marker_disarm() as many times as marker_arm() has been called. Removing a probe
is done through marker_probe_unregister(); it will disarm the probe.
marker_synchronize_unregister() must be called before the end of the module exit
function to make sure there is no caller left using the probe. This, and the
fact that preemption is disabled around the probe call, make sure that probe
removal and module unload are safe. See the "Probe example" section below for a
sample probe module.
marker_synchronize_unregister() must be called between probe unregistration and
the first occurrence of
- the end of module exit function,
to make sure there is no caller left using the probe;
- the free of any resource used by the probes,
to make sure the probes wont be accessing invalid data.
This, and the fact that preemption is disabled around the probe call, make sure
that probe removal and module unload are safe. See the "Probe example" section
below for a sample probe module.
The marker mechanism supports inserting multiple instances of the same marker.
Markers can be put in inline functions, inlined static functions, and

4
Documentation/tracepoints.txt
View File

@ -45,7 +45,7 @@ In include/trace/subsys.h :
#include <linux/tracepoint.h>
DECLARE_TRACE(subsys_eventname,
TPPTOTO(int firstarg, struct task_struct *p),
TPPROTO(int firstarg, struct task_struct *p),
TPARGS(firstarg, p));
In subsys/file.c (where the tracing statement must be added) :
@ -66,7 +66,7 @@ Where :
- subsys is the name of your subsystem.
- eventname is the name of the event to trace.
- TPPTOTO(int firstarg, struct task_struct *p) is the prototype of the
- TPPROTO(int firstarg, struct task_struct *p) is the prototype of the
function called by this tracepoint.
- TPARGS(firstarg, p) are the parameters names, same as found in the

1
arch/powerpc/kernel/Makefile
View File

@ -17,6 +17,7 @@ ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_cputable.o = -pg -mno-sched-epilog
CFLAGS_REMOVE_prom_init.o = -pg -mno-sched-epilog
CFLAGS_REMOVE_btext.o = -pg -mno-sched-epilog
CFLAGS_REMOVE_prom.o = -pg -mno-sched-epilog
ifdef CONFIG_DYNAMIC_FTRACE
# dynamic ftrace setup.

40
arch/powerpc/kernel/entry_32.S
View File

@ -1162,39 +1162,17 @@ machine_check_in_rtas:
#ifdef CONFIG_DYNAMIC_FTRACE
_GLOBAL(mcount)
_GLOBAL(_mcount)
stwu r1,-48(r1)
stw r3, 12(r1)
stw r4, 16(r1)
stw r5, 20(r1)
stw r6, 24(r1)
mflr r3
stw r7, 28(r1)
mfcr r5
stw r8, 32(r1)
stw r9, 36(r1)
stw r10,40(r1)
stw r3, 44(r1)
stw r5, 8(r1)
subi r3, r3, MCOUNT_INSN_SIZE
.globl mcount_call
mcount_call:
bl ftrace_stub
nop
lwz r6, 8(r1)
lwz r0, 44(r1)
lwz r3, 12(r1)
/*
* It is required that _mcount on PPC32 must preserve the
* link register. But we have r0 to play with. We use r0
* to push the return address back to the caller of mcount
* into the ctr register, restore the link register and
* then jump back using the ctr register.
*/
mflr r0
mtctr r0
lwz r4, 16(r1)
mtcr r6
lwz r5, 20(r1)
lwz r6, 24(r1)
lwz r0, 52(r1)
lwz r7, 28(r1)
lwz r8, 32(r1)
lwz r0, 4(r1)
mtlr r0
lwz r9, 36(r1)
lwz r10,40(r1)
addi r1, r1, 48
bctr
_GLOBAL(ftrace_caller)

12
arch/powerpc/kernel/entry_64.S
View File

@ -888,18 +888,6 @@ _GLOBAL(enter_prom)
#ifdef CONFIG_DYNAMIC_FTRACE
_GLOBAL(mcount)
_GLOBAL(_mcount)
/* Taken from output of objdump from lib64/glibc */
mflr r3
stdu r1, -112(r1)
std r3, 128(r1)
subi r3, r3, MCOUNT_INSN_SIZE
.globl mcount_call
mcount_call:
bl ftrace_stub
nop
ld r0, 128(r1)
mtlr r0
addi r1, r1, 112
blr
_GLOBAL(ftrace_caller)

182
arch/powerpc/kernel/ftrace.c
View File

@ -114,19 +114,9 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
*/
static int test_24bit_addr(unsigned long ip, unsigned long addr)
{
long diff;
/*
* Can we get to addr from ip in 24 bits?
* (26 really, since we mulitply by 4 for 4 byte alignment)
*/
diff = addr - ip;
/*
* Return true if diff is less than 1 << 25
* and greater than -1 << 26.
*/
return (diff < (1 << 25)) && (diff > (-1 << 26));
/* use the create_branch to verify that this offset can be branched */
return create_branch((unsigned int *)ip, addr, 0);
}
static int is_bl_op(unsigned int op)
@ -134,11 +124,6 @@ static int is_bl_op(unsigned int op)
return (op & 0xfc000003) == 0x48000001;
}
static int test_offset(unsigned long offset)
{
return (offset + 0x2000000 > 0x3ffffff) || ((offset & 3) != 0);
}
static unsigned long find_bl_target(unsigned long ip, unsigned int op)
{
static int offset;
@ -151,37 +136,30 @@ static unsigned long find_bl_target(unsigned long ip, unsigned int op)
return ip + (long)offset;
}
static unsigned int branch_offset(unsigned long offset)
{
/* return "bl ip+offset" */
return 0x48000001 | (offset & 0x03fffffc);
}
#ifdef CONFIG_PPC64
static int
__ftrace_make_nop(struct module *mod,
struct dyn_ftrace *rec, unsigned long addr)
{
unsigned char replaced[MCOUNT_INSN_SIZE * 2];
unsigned int *op = (unsigned *)&replaced;
unsigned char jmp[8];
unsigned long *ptr = (unsigned long *)&jmp;
unsigned int op;
unsigned int jmp[5];
unsigned long ptr;
unsigned long ip = rec->ip;
unsigned long tramp;
int offset;
/* read where this goes */
if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
if (probe_kernel_read(&op, (void *)ip, sizeof(int)))
return -EFAULT;
/* Make sure that that this is still a 24bit jump */
if (!is_bl_op(*op)) {
printk(KERN_ERR "Not expected bl: opcode is %x\n", *op);
if (!is_bl_op(op)) {
printk(KERN_ERR "Not expected bl: opcode is %x\n", op);
return -EINVAL;
}
/* lets find where the pointer goes */
tramp = find_bl_target(ip, *op);
tramp = find_bl_target(ip, op);
/*
* On PPC64 the trampoline looks like:
@ -200,19 +178,25 @@ __ftrace_make_nop(struct module *mod,
DEBUGP("ip:%lx jumps to %lx r2: %lx", ip, tramp, mod->arch.toc);
/* Find where the trampoline jumps to */
if (probe_kernel_read(jmp, (void *)tramp, 8)) {
if (probe_kernel_read(jmp, (void *)tramp, sizeof(jmp))) {
printk(KERN_ERR "Failed to read %lx\n", tramp);
return -EFAULT;
}
DEBUGP(" %08x %08x",
(unsigned)(*ptr >> 32),
(unsigned)*ptr);
DEBUGP(" %08x %08x", jmp[0], jmp[1]);
offset = (unsigned)jmp[2] << 24 |
(unsigned)jmp[3] << 16 |
(unsigned)jmp[6] << 8 |
(unsigned)jmp[7];
/* verify that this is what we expect it to be */
if (((jmp[0] & 0xffff0000) != 0x3d820000) ||
((jmp[1] & 0xffff0000) != 0x398c0000) ||
(jmp[2] != 0xf8410028) ||
(jmp[3] != 0xe96c0020) ||
(jmp[4] != 0xe84c0028)) {
printk(KERN_ERR "Not a trampoline\n");
return -EINVAL;
}
offset = (unsigned)((unsigned short)jmp[0]) << 16 |
(unsigned)((unsigned short)jmp[1]);
DEBUGP(" %x ", offset);
@ -225,13 +209,13 @@ __ftrace_make_nop(struct module *mod,
return -EFAULT;
}
DEBUGP(" %08x %08x\n",
(unsigned)(*ptr >> 32),
(unsigned)*ptr);
DEBUGP(" %08x %08x\n", jmp[0], jmp[1]);
ptr = ((unsigned long)jmp[0] << 32) + jmp[1];
/* This should match what was called */
if (*ptr != GET_ADDR(addr)) {
printk(KERN_ERR "addr does not match %lx\n", *ptr);
if (ptr != GET_ADDR(addr)) {
printk(KERN_ERR "addr does not match %lx\n", ptr);
return -EINVAL;
}
@ -240,11 +224,11 @@ __ftrace_make_nop(struct module *mod,
* 0xe8, 0x41, 0x00, 0x28 ld r2,40(r1)
* This needs to be turned to a nop too.
*/
if (probe_kernel_read(replaced, (void *)(ip+4), MCOUNT_INSN_SIZE))
if (probe_kernel_read(&op, (void *)(ip+4), MCOUNT_INSN_SIZE))
return -EFAULT;
if (*op != 0xe8410028) {
printk(KERN_ERR "Next line is not ld! (%08x)\n", *op);
if (op != 0xe8410028) {
printk(KERN_ERR "Next line is not ld! (%08x)\n", op);
return -EINVAL;
}
@ -261,11 +245,14 @@ __ftrace_make_nop(struct module *mod,
* ld r2,40(r1)
* 1:
*/
op[0] = 0x48000008; /* b +8 */
op = 0x48000008; /* b +8 */
if (probe_kernel_write((void *)ip, replaced, MCOUNT_INSN_SIZE))
if (probe_kernel_write((void *)ip, &op, MCOUNT_INSN_SIZE))
return -EPERM;
flush_icache_range(ip, ip + 8);
return 0;
}
@ -274,46 +261,52 @@ static int
__ftrace_make_nop(struct module *mod,
struct dyn_ftrace *rec, unsigned long addr)
{
unsigned char replaced[MCOUNT_INSN_SIZE];
unsigned int *op = (unsigned *)&replaced;
unsigned char jmp[8];
unsigned int *ptr = (unsigned int *)&jmp;
unsigned int op;
unsigned int jmp[4];
unsigned long ip = rec->ip;
unsigned long tramp;
int offset;
if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
if (probe_kernel_read(&op, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
/* Make sure that that this is still a 24bit jump */
if (!is_bl_op(*op)) {
printk(KERN_ERR "Not expected bl: opcode is %x\n", *op);
if (!is_bl_op(op)) {
printk(KERN_ERR "Not expected bl: opcode is %x\n", op);
return -EINVAL;
}
/* lets find where the pointer goes */
tramp = find_bl_target(ip, *op);
tramp = find_bl_target(ip, op);
/*
* On PPC32 the trampoline looks like:
* lis r11,sym@ha
* addi r11,r11,sym@l
* mtctr r11
* bctr
* 0x3d, 0x60, 0x00, 0x00 lis r11,sym@ha
* 0x39, 0x6b, 0x00, 0x00 addi r11,r11,sym@l
* 0x7d, 0x69, 0x03, 0xa6 mtctr r11
* 0x4e, 0x80, 0x04, 0x20 bctr
*/
DEBUGP("ip:%lx jumps to %lx", ip, tramp);
/* Find where the trampoline jumps to */
if (probe_kernel_read(jmp, (void *)tramp, 8)) {
if (probe_kernel_read(jmp, (void *)tramp, sizeof(jmp))) {
printk(KERN_ERR "Failed to read %lx\n", tramp);
return -EFAULT;
}
DEBUGP(" %08x %08x ", ptr[0], ptr[1]);
DEBUGP(" %08x %08x ", jmp[0], jmp[1]);
tramp = (ptr[1] & 0xffff) |
((ptr[0] & 0xffff) << 16);
/* verify that this is what we expect it to be */
if (((jmp[0] & 0xffff0000) != 0x3d600000) ||
((jmp[1] & 0xffff0000) != 0x396b0000) ||
(jmp[2] != 0x7d6903a6) ||
(jmp[3] != 0x4e800420)) {
printk(KERN_ERR "Not a trampoline\n");
return -EINVAL;
}
tramp = (jmp[1] & 0xffff) |
((jmp[0] & 0xffff) << 16);
if (tramp & 0x8000)
tramp -= 0x10000;
@ -326,11 +319,13 @@ __ftrace_make_nop(struct module *mod,
return -EINVAL;
}
op[0] = PPC_NOP_INSTR;
op = PPC_NOP_INSTR;
if (probe_kernel_write((void *)ip, replaced, MCOUNT_INSN_SIZE))
if (probe_kernel_write((void *)ip, &op, MCOUNT_INSN_SIZE))
return -EPERM;
flush_icache_range(ip, ip + 8);
return 0;
}
#endif /* PPC64 */
@ -384,13 +379,11 @@ int ftrace_make_nop(struct module *mod,
static int
__ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
unsigned char replaced[MCOUNT_INSN_SIZE * 2];
unsigned int *op = (unsigned *)&replaced;
unsigned int op[2];
unsigned long ip = rec->ip;
unsigned long offset;
/* read where this goes */
if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE * 2))
if (probe_kernel_read(op, (void *)ip, MCOUNT_INSN_SIZE * 2))
return -EFAULT;
/*
@ -409,43 +402,40 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
return -EINVAL;
}
/* now calculate a jump to the ftrace caller trampoline */
offset = rec->arch.mod->arch.tramp - ip;
if (test_offset(offset)) {
printk(KERN_ERR "REL24 %li out of range!\n",
(long int)offset);
/* create the branch to the trampoline */
op[0] = create_branch((unsigned int *)ip,
rec->arch.mod->arch.tramp, BRANCH_SET_LINK);
if (!op[0]) {
printk(KERN_ERR "REL24 out of range!\n");
return -EINVAL;
}
/* Set to "bl addr" */
op[0] = branch_offset(offset);
/* ld r2,40(r1) */
op[1] = 0xe8410028;
DEBUGP("write to %lx\n", rec->ip);
if (probe_kernel_write((void *)ip, replaced, MCOUNT_INSN_SIZE * 2))
if (probe_kernel_write((void *)ip, op, MCOUNT_INSN_SIZE * 2))
return -EPERM;
flush_icache_range(ip, ip + 8);
return 0;
}
#else
static int
__ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
unsigned char replaced[MCOUNT_INSN_SIZE];
unsigned int *op = (unsigned *)&replaced;
unsigned int op;
unsigned long ip = rec->ip;
unsigned long offset;
/* read where this goes */
if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
if (probe_kernel_read(&op, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
/* It should be pointing to a nop */
if (op[0] != PPC_NOP_INSTR) {
printk(KERN_ERR "Expected NOP but have %x\n", op[0]);
if (op != PPC_NOP_INSTR) {
printk(KERN_ERR "Expected NOP but have %x\n", op);
return -EINVAL;
}
@ -455,23 +445,21 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
return -EINVAL;
}
/* now calculate a jump to the ftrace caller trampoline */
offset = rec->arch.mod->arch.tramp - ip;
if (test_offset(offset)) {
printk(KERN_ERR "REL24 %li out of range!\n",
(long int)offset);
/* create the branch to the trampoline */
op = create_branch((unsigned int *)ip,
rec->arch.mod->arch.tramp, BRANCH_SET_LINK);
if (!op) {
printk(KERN_ERR "REL24 out of range!\n");
return -EINVAL;
}
/* Set to "bl addr" */
op[0] = branch_offset(offset);
DEBUGP("write to %lx\n", rec->ip);
if (probe_kernel_write((void *)ip, replaced, MCOUNT_INSN_SIZE))
if (probe_kernel_write((void *)ip, &op, MCOUNT_INSN_SIZE))
return -EPERM;
flush_icache_range(ip, ip + 8);
return 0;
}
#endif /* CONFIG_PPC64 */

3
arch/powerpc/lib/Makefile
View File

@ -6,6 +6,9 @@ ifeq ($(CONFIG_PPC64),y)
EXTRA_CFLAGS += -mno-minimal-toc
endif
CFLAGS_REMOVE_code-patching.o = -pg
CFLAGS_REMOVE_feature-fixups.o = -pg
obj-y := string.o alloc.o \
checksum_$(CONFIG_WORD_SIZE).o
obj-$(CONFIG_PPC32) += div64.o copy_32.o crtsavres.o

2
fs/seq_file.c
View File

@ -387,7 +387,7 @@ char *mangle_path(char *s, char *p, char *esc)
}
return NULL;
}
EXPORT_SYMBOL_GPL(mangle_path);
EXPORT_SYMBOL(mangle_path);
/*
* return the absolute path of 'dentry' residing in mount 'mnt'.

6
include/linux/marker.h
View File

@ -211,8 +211,10 @@ extern void *marker_get_private_data(const char *name, marker_probe_func *probe,
/*
* marker_synchronize_unregister must be called between the last marker probe
* unregistration and the end of module exit to make sure there is no caller
* executing a probe when it is freed.
* unregistration and the first one of
* - the end of module exit function
* - the free of any resource used by the probes
* to ensure the code and data are valid for any possibly running probes.
*/
#define marker_synchronize_unregister() synchronize_sched()

27
kernel/trace/ftrace.c
View File

@ -786,7 +786,6 @@ enum {
#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
struct ftrace_iterator {
loff_t pos;
struct ftrace_page *pg;
unsigned idx;
unsigned flags;
@ -811,6 +810,8 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
iter->pg = iter->pg->next;
iter->idx = 0;
goto retry;
} else {
iter->idx = -1;
}
} else {
rec = &iter->pg->records[iter->idx++];
@ -833,8 +834,6 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
}
spin_unlock(&ftrace_lock);
iter->pos = *pos;
return rec;
}
@ -842,13 +841,15 @@ static void *t_start(struct seq_file *m, loff_t *pos)
{
struct ftrace_iterator *iter = m->private;
void *p = NULL;
loff_t l = -1;
if (*pos > iter->pos)
*pos = iter->pos;
if (*pos > 0) {
if (iter->idx < 0)
return p;
(*pos)--;
iter->idx--;
}
l = *pos;
p = t_next(m, p, &l);
p = t_next(m, p, pos);
return p;
}
@ -859,21 +860,15 @@ static void t_stop(struct seq_file *m, void *p)
static int t_show(struct seq_file *m, void *v)
{
struct ftrace_iterator *iter = m->private;
struct dyn_ftrace *rec = v;
char str[KSYM_SYMBOL_LEN];
int ret = 0;
if (!rec)
return 0;
kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
ret = seq_printf(m, "%s\n", str);
if (ret < 0) {
iter->pos--;
iter->idx--;
}
seq_printf(m, "%s\n", str);
return 0;
}
@ -899,7 +894,6 @@ ftrace_avail_open(struct inode *inode, struct file *file)
return -ENOMEM;
iter->pg = ftrace_pages_start;
iter->pos = 0;
ret = seq_open(file, &show_ftrace_seq_ops);
if (!ret) {
@ -986,7 +980,6 @@ ftrace_regex_open(struct inode *inode, struct file *file, int enable)
if (file->f_mode & FMODE_READ) {
iter->pg = ftrace_pages_start;
iter->pos = 0;
iter->flags = enable ? FTRACE_ITER_FILTER :
FTRACE_ITER_NOTRACE;

2
kernel/trace/trace.c
View File

@ -983,6 +983,7 @@ static void ftrace_trace_userstack(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long flags, int pc)
{
#ifdef CONFIG_STACKTRACE
struct ring_buffer_event *event;
struct userstack_entry *entry;
struct stack_trace trace;
@ -1008,6 +1009,7 @@ static void ftrace_trace_userstack(struct trace_array *tr,
save_stack_trace_user(&trace);
ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
#endif
}
void __trace_userstack(struct trace_array *tr,

1
kernel/trace/trace_branch.c
View File

@ -6,6 +6,7 @@
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/irqflags.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/module.h>

273
kernel/trace/trace_functions_graph.c
View File

@ -15,15 +15,24 @@
#define TRACE_GRAPH_INDENT 2
/* Flag options */
#define TRACE_GRAPH_PRINT_OVERRUN 0x1
#define TRACE_GRAPH_PRINT_CPU 0x2
#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
static struct tracer_opt trace_opts[] = {
/* Display overruns or not */
{ TRACER_OPT(overrun, TRACE_GRAPH_PRINT_OVERRUN) },
/* Display overruns ? */
{ TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
/* Display CPU ? */
{ TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
/* Display Overhead ? */
{ TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
{ } /* Empty entry */
};
static struct tracer_flags tracer_flags = {
.val = 0, /* Don't display overruns by default */
/* Don't display overruns by default */
.val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD,
.opts = trace_opts
};
@ -52,37 +61,208 @@ static void graph_trace_reset(struct trace_array *tr)
unregister_ftrace_graph();
}
static inline int log10_cpu(int nb)
{
if (nb / 100)
return 3;
if (nb / 10)
return 2;
return 1;
}
static enum print_line_t
print_graph_cpu(struct trace_seq *s, int cpu)
{
int i;
int ret;
int log10_this = log10_cpu(cpu);
int log10_all = log10_cpu(cpus_weight_nr(cpu_online_map));
/*
* Start with a space character - to make it stand out
* to the right a bit when trace output is pasted into
* email:
*/
ret = trace_seq_printf(s, " ");
/*
* Tricky - we space the CPU field according to the max
* number of online CPUs. On a 2-cpu system it would take
* a maximum of 1 digit - on a 128 cpu system it would
* take up to 3 digits:
*/
for (i = 0; i < log10_all - log10_this; i++) {
ret = trace_seq_printf(s, " ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
ret = trace_seq_printf(s, "%d) ", cpu);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
/* If the pid changed since the last trace, output this event */
static int verif_pid(struct trace_seq *s, pid_t pid, int cpu)
{
char *comm;
char *comm, *prev_comm;
pid_t prev_pid;
int ret;
if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
return 1;
prev_pid = last_pid[cpu];
last_pid[cpu] = pid;
comm = trace_find_cmdline(pid);
return trace_seq_printf(s, "\nCPU[%03d]"
" ------------8<---------- thread %s-%d"
" ------------8<----------\n\n",
cpu, comm, pid);
comm = trace_find_cmdline(pid);
prev_comm = trace_find_cmdline(prev_pid);
/*
* Context-switch trace line:
------------------------------------------
| 1) migration/0--1 => sshd-1755
------------------------------------------
*/
ret = trace_seq_printf(s,
" ------------------------------------------\n");
ret += trace_seq_printf(s, " | %d) %s-%d => %s-%d\n",
cpu, prev_comm, prev_pid, comm, pid);
ret += trace_seq_printf(s,
" ------------------------------------------\n\n");
return ret;
}
static enum print_line_t
print_graph_entry(struct ftrace_graph_ent *call, struct trace_seq *s,
struct trace_entry *ent, int cpu)
static bool
trace_branch_is_leaf(struct trace_iterator *iter,
struct ftrace_graph_ent_entry *curr)
{
int i;
struct ring_buffer_iter *ring_iter;
struct ring_buffer_event *event;
struct ftrace_graph_ret_entry *next;
ring_iter = iter->buffer_iter[iter->cpu];
if (!ring_iter)
return false;
event = ring_buffer_iter_peek(ring_iter, NULL);
if (!event)
return false;
next = ring_buffer_event_data(event);
if (next->ent.type != TRACE_GRAPH_RET)
return false;
if (curr->ent.pid != next->ent.pid ||
curr->graph_ent.func != next->ret.func)
return false;
return true;
}
static inline int
print_graph_duration(unsigned long long duration, struct trace_seq *s)
{
unsigned long nsecs_rem = do_div(duration, 1000);
return trace_seq_printf(s, "%4llu.%3lu us | ", duration, nsecs_rem);
}
/* Signal a overhead of time execution to the output */
static int
print_graph_overhead(unsigned long long duration, struct trace_seq *s)
{
/* Duration exceeded 100 msecs */
if (duration > 100000ULL)
return trace_seq_printf(s, "! ");
/* Duration exceeded 10 msecs */
if (duration > 10000ULL)
return trace_seq_printf(s, "+ ");
return trace_seq_printf(s, " ");
}
/* Case of a leaf function on its call entry */
static enum print_line_t
print_graph_entry_leaf(struct trace_iterator *iter,
struct ftrace_graph_ent_entry *entry, struct trace_seq *s)
{
struct ftrace_graph_ret_entry *ret_entry;
struct ftrace_graph_ret *graph_ret;
struct ring_buffer_event *event;
struct ftrace_graph_ent *call;
unsigned long long duration;
int ret;
int i;
if (!verif_pid(s, ent->pid, cpu))
return TRACE_TYPE_PARTIAL_LINE;
event = ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
ret_entry = ring_buffer_event_data(event);
graph_ret = &ret_entry->ret;
call = &entry->graph_ent;
duration = graph_ret->rettime - graph_ret->calltime;
ret = trace_seq_printf(s, "CPU[%03d] ", cpu);
/* Must not exceed 8 characters: 9999.999 us */
if (duration > 10000000ULL)
duration = 9999999ULL;
/* Overhead */
if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
ret = print_graph_overhead(duration, s);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
/* Duration */
ret = print_graph_duration(duration, s);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
ret = trace_seq_printf(s, " ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
ret = seq_print_ip_sym(s, call->func, 0);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
ret = trace_seq_printf(s, "();\n");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t
print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
struct trace_seq *s)
{
int i;
int ret;
struct ftrace_graph_ent *call = &entry->graph_ent;
/* No overhead */
if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
ret = trace_seq_printf(s, " ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
/* No time */
ret = trace_seq_printf(s, " | ");
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
ret = trace_seq_printf(s, " ");
if (!ret)
@ -96,37 +276,82 @@ print_graph_entry(struct ftrace_graph_ent *call, struct trace_seq *s,
ret = trace_seq_printf(s, "() {\n");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t
print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
struct trace_iterator *iter, int cpu)
{
int ret;
struct trace_entry *ent = iter->ent;
/* Pid */
if (!verif_pid(s, ent->pid, cpu))
return TRACE_TYPE_PARTIAL_LINE;
/* Cpu */
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
ret = print_graph_cpu(s, cpu);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
if (trace_branch_is_leaf(iter, field))
return print_graph_entry_leaf(iter, field, s);
else
return print_graph_entry_nested(field, s);
}
static enum print_line_t
print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
struct trace_entry *ent, int cpu)
{
int i;
int ret;
unsigned long long duration = trace->rettime - trace->calltime;
/* Must not exceed 8 characters: xxxx.yyy us */
if (duration > 10000000ULL)
duration = 9999999ULL;
/* Pid */
if (!verif_pid(s, ent->pid, cpu))
return TRACE_TYPE_PARTIAL_LINE;
ret = trace_seq_printf(s, "CPU[%03d] ", cpu);
/* Cpu */
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
ret = print_graph_cpu(s, cpu);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
/* Overhead */
if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
ret = print_graph_overhead(duration, s);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
/* Duration */
ret = print_graph_duration(duration, s);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Closing brace */
for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
ret = trace_seq_printf(s, " ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
ret = trace_seq_printf(s, "} ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
ret = trace_seq_printf(s, "%llu\n", trace->rettime - trace->calltime);
ret = trace_seq_printf(s, "}\n");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
/* Overrun */
if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERRUN) {
ret = trace_seq_printf(s, " (Overruns: %lu)\n",
trace->overrun);
@ -146,7 +371,7 @@ print_graph_function(struct trace_iterator *iter)
case TRACE_GRAPH_ENT: {
struct ftrace_graph_ent_entry *field;
trace_assign_type(field, entry);
return print_graph_entry(&field->graph_ent, s, entry,
return print_graph_entry(field, s, iter,
iter->cpu);
}
case TRACE_GRAPH_RET: {
@ -160,7 +385,7 @@ print_graph_function(struct trace_iterator *iter)
}
static struct tracer graph_trace __read_mostly = {
.name = "function-graph",
.name = "function_graph",
.init = graph_trace_init,
.reset = graph_trace_reset,
.print_line = print_graph_function,