forked from luck/tmp_suning_uos_patched
ksym_tracer: Extract trace entry from struct trace_ksym
struct trace_ksym is used as an entry in hbp list, and is also used as trace_entry stored in ring buffer. This is not necessary and is a waste of memory in ring buffer. There is also a bug that dereferencing field->ksym_hbp in ksym_trace_output() can be invalid. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E2A4.4050007@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
9d22b53660
commit
db59504d89
|
@ -215,17 +215,12 @@ struct syscall_trace_exit {
|
|||
#define KSYM_SELFTEST_ENTRY "ksym_selftest_dummy"
|
||||
extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
|
||||
|
||||
struct trace_ksym {
|
||||
struct ksym_trace_entry {
|
||||
struct trace_entry ent;
|
||||
struct hw_breakpoint *ksym_hbp;
|
||||
unsigned long ksym_addr;
|
||||
unsigned long ip;
|
||||
#ifdef CONFIG_PROFILE_KSYM_TRACER
|
||||
unsigned long counter;
|
||||
#endif
|
||||
struct hlist_node ksym_hlist;
|
||||
unsigned char type;
|
||||
char ksym_name[KSYM_NAME_LEN];
|
||||
char p_name[TASK_COMM_LEN];
|
||||
char cmd[TASK_COMM_LEN];
|
||||
};
|
||||
|
||||
/*
|
||||
|
@ -343,7 +338,7 @@ extern void __ftrace_bad_type(void);
|
|||
TRACE_SYSCALL_ENTER); \
|
||||
IF_ASSIGN(var, ent, struct syscall_trace_exit, \
|
||||
TRACE_SYSCALL_EXIT); \
|
||||
IF_ASSIGN(var, ent, struct trace_ksym, TRACE_KSYM); \
|
||||
IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
|
||||
__ftrace_bad_type(); \
|
||||
} while (0)
|
||||
|
||||
|
|
|
@ -37,6 +37,15 @@
|
|||
#define KSYM_TRACER_OP_LEN 3 /* rw- */
|
||||
#define KSYM_FILTER_ENTRY_LEN (KSYM_NAME_LEN + KSYM_TRACER_OP_LEN + 1)
|
||||
|
||||
struct trace_ksym {
|
||||
struct hw_breakpoint *ksym_hbp;
|
||||
unsigned long ksym_addr;
|
||||
#ifdef CONFIG_PROFILE_KSYM_TRACER
|
||||
unsigned long counter;
|
||||
#endif
|
||||
struct hlist_node ksym_hlist;
|
||||
};
|
||||
|
||||
static struct trace_array *ksym_trace_array;
|
||||
|
||||
static unsigned int ksym_filter_entry_count;
|
||||
|
@ -71,7 +80,7 @@ void ksym_hbp_handler(struct hw_breakpoint *hbp, struct pt_regs *regs)
|
|||
{
|
||||
struct ring_buffer_event *event;
|
||||
struct trace_array *tr;
|
||||
struct trace_ksym *entry;
|
||||
struct ksym_trace_entry *entry;
|
||||
int pc;
|
||||
|
||||
if (!ksym_tracing_enabled)
|
||||
|
@ -86,10 +95,11 @@ void ksym_hbp_handler(struct hw_breakpoint *hbp, struct pt_regs *regs)
|
|||
return;
|
||||
|
||||
entry = ring_buffer_event_data(event);
|
||||
strlcpy(entry->ksym_name, hbp->info.name, KSYM_SYMBOL_LEN);
|
||||
entry->ksym_hbp = hbp;
|
||||
entry->ip = instruction_pointer(regs);
|
||||
strlcpy(entry->p_name, current->comm, TASK_COMM_LEN);
|
||||
entry->type = hbp->info.type;
|
||||
strlcpy(entry->ksym_name, hbp->info.name, KSYM_SYMBOL_LEN);
|
||||
strlcpy(entry->cmd, current->comm, TASK_COMM_LEN);
|
||||
|
||||
#ifdef CONFIG_PROFILE_KSYM_TRACER
|
||||
ksym_collect_stats(hbp->info.address);
|
||||
#endif /* CONFIG_PROFILE_KSYM_TRACER */
|
||||
|
@ -380,7 +390,7 @@ static enum print_line_t ksym_trace_output(struct trace_iterator *iter)
|
|||
{
|
||||
struct trace_entry *entry = iter->ent;
|
||||
struct trace_seq *s = &iter->seq;
|
||||
struct trace_ksym *field;
|
||||
struct ksym_trace_entry *field;
|
||||
char str[KSYM_SYMBOL_LEN];
|
||||
int ret;
|
||||
|
||||
|
@ -389,12 +399,12 @@ static enum print_line_t ksym_trace_output(struct trace_iterator *iter)
|
|||
|
||||
trace_assign_type(field, entry);
|
||||
|
||||
ret = trace_seq_printf(s, "%-15s %-5d %-3d %-20s ", field->p_name,
|
||||
ret = trace_seq_printf(s, "%-15s %-5d %-3d %-20s ", field->cmd,
|
||||
entry->pid, iter->cpu, field->ksym_name);
|
||||
if (!ret)
|
||||
return TRACE_TYPE_PARTIAL_LINE;
|
||||
|
||||
switch (field->ksym_hbp->info.type) {
|
||||
switch (field->type) {
|
||||
case HW_BREAKPOINT_WRITE:
|
||||
ret = trace_seq_printf(s, " W ");
|
||||
break;
|
||||
|
|
Loading…
Reference in New Issue
Block a user