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Date: Mon, 2 Mar 2009 18:47:58 +0100
From: Frédéric Weisbecker <fweisbec@...il.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Lai Jiangshan <laijs@...fujitsu.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] tracing/core: drop the old ftrace_printk
implementation in favour of ftrace_bprintk
2009/3/2 Steven Rostedt <rostedt@...dmis.org>:
>
> On Sat, 28 Feb 2009, Frederic Weisbecker wrote:
>
>> Impact: faster and lighter tracing
>>
>> Now that we have ftrace_bprintk() which is faster and consume lesser
>> memory than ftrace_printk() and has the same purpose, we can now drop
>> the old implementation in favour of the binary one from ftrace_bprintk(),
>> which means we move all the implementation of ftrace_bprintk() to
>> ftrace_printk(), so the Api doesn't change except that we must now use
>> trace_seq_bprintk() to print the TRACE_PRINT entries.
>>
>> Some changes result of this:
>>
>> - Previously, ftrace_bprintk depended of a single tracer and couldn't
>> work without. This tracer has been dropped and the whole implementation
>> of ftrace_printk() (like the module formats management) is now integrated
>> in the tracing core (comes with CONFIG_TRACING), though we keep the file
>> trace_bprintk (previously trace_bprintk.c) where we can find the module
>
> ^^^^^^^^^^^^^
>
> Do you mean trace_printk.c ?
Exact :-)
I will resend a new iteration of this serie to address your reviews.
Thanks!
>
>> management. Thus we don't overflow trace.c
>>
>> - changes some parts to use trace_seq_bprintk() to print TRACE_PRINT entries.
>>
>> - change a bit ftrace_printk/ftrace_vprintk macros to support non-builtin formats
>> constants, and fix 'const' qualifiers warnings. But this is all transparent for
>> developers.
>>
>> - etc...
>>
>> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
>> ---
>> include/linux/ftrace.h | 68 ++++----
>> include/linux/module.h | 2 +-
>> kernel/trace/Kconfig | 7 +-
>> kernel/trace/Makefile | 2 +-
>> kernel/trace/trace.c | 209 +++++++---------------
>> kernel/trace/trace.h | 14 +--
>> kernel/trace/trace_functions_graph.c | 6 +-
>> kernel/trace/trace_mmiotrace.c | 9 +-
>> kernel/trace/trace_output.c | 69 +------
>> kernel/trace/trace_output.h | 2 +
>> kernel/trace/{trace_bprintk.c => trace_printk.c} | 113 ++++--------
>> 11 files changed, 162 insertions(+), 339 deletions(-)
>>
>> diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
>> index f82b986..696a09b 100644
>> --- a/include/linux/ftrace.h
>> +++ b/include/linux/ftrace.h
>> @@ -222,31 +222,6 @@ extern int ftrace_make_nop(struct module *mod,
>> */
>> extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
>>
>> -#ifdef CONFIG_TRACE_BPRINTK
>> -extern int trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
>> -extern int __ftrace_bprintk(unsigned long ip, const char *fmt, ...)
>> - __attribute__ ((format (printf, 2, 3)));
>> -
>> -static inline void ____ftrace_bprintk_check_format(const char *fmt, ...)
>> - __attribute__ ((format (printf, 1, 2)));
>> -static inline void ____ftrace_bprintk_check_format(const char *fmt, ...) {}
>> -#define __ftrace_bprintk_check_format(fmt, args...) \
>> -do { \
>> - if (0) \
>> - ____ftrace_bprintk_check_format(fmt, ##args); \
>> -} while (0)
>> -
>> -#define ftrace_bprintk(fmt, args...) \
>> -do { \
>> - static char *__attribute__((section("__trace_bprintk_fmt"))) \
>> - ftrace_bprintk_fmt = fmt; \
>> - __ftrace_bprintk_check_format(fmt, ##args); \
>> - __ftrace_bprintk(_THIS_IP_, ftrace_bprintk_fmt, ##args); \
>> -} while (0)
>> -#else
>> -#define ftrace_bprintk ftrace_printk
>> -#endif
>> -
>> /* May be defined in arch */
>> extern int ftrace_arch_read_dyn_info(char *buf, int size);
>>
>> @@ -367,15 +342,40 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
>> * Please refrain from leaving ftrace_printks scattered around in
>> * your code.
>> */
>> -# define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
>> -extern int
>> -__ftrace_printk(unsigned long ip, const char *fmt, ...)
>> - __attribute__ ((format (printf, 2, 3)));
>> -# define ftrace_vprintk(fmt, ap) __ftrace_printk(_THIS_IP_, fmt, ap)
>> -extern int
>> -__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
>> +extern int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list args);
>> +extern int __ftrace_printk(unsigned long ip, const char *fmt, ...)
>> + __attribute__ ((format (printf, 2, 3)));
>> +
>> +static inline void ____ftrace_printk_check_format(const char *fmt, ...)
>> + __attribute__ ((format (printf, 1, 2)));
>> +static inline void ____ftrace_printk_check_format(const char *fmt, ...) {}
>> +#define __ftrace_printk_check_format(fmt, args...) \
>> +do { \
>> + if (0) \
>> + ____ftrace_printk_check_format(fmt, ##args); \
>> +} while (0)
>> +
>> +#define ftrace_vprintk(fmt, vargs) \
>> +do { \
>> + static const char *ftrace_printk_fmt \
>> + __attribute__((section("__trace_bprintk_fmt"))); \
>> + ftrace_printk_fmt = fmt; \
>> + __ftrace_vprintk(_THIS_IP_, ftrace_printk_fmt, vargs); \
>> +} while (0)
>> +
>> +#define ftrace_printk(fmt, args...) \
>> +do { \
>> + static const char *ftrace_printk_fmt \
>> + __attribute__((section("__trace_bprintk_fmt"))); \
>> + ftrace_printk_fmt = fmt; \
>> + __ftrace_printk_check_format(fmt, ##args); \
>> + __ftrace_printk(_THIS_IP_, ftrace_printk_fmt, ##args); \
>> +} while (0)
>> +
>> extern void ftrace_dump(void);
>> -#else
>> +
>> +#else /* !CONFIG_TRACING */
>> +
>> static inline void
>> ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
>> static inline int
>> @@ -395,7 +395,7 @@ ftrace_vprintk(const char *fmt, va_list ap)
>> return 0;
>> }
>> static inline void ftrace_dump(void) { }
>> -#endif
>> +#endif /* CONFIG_TRACING */
>>
>> #ifdef CONFIG_FTRACE_MCOUNT_RECORD
>> extern void ftrace_init(void);
>> diff --git a/include/linux/module.h b/include/linux/module.h
>> index c4f2845..e418da1 100644
>> --- a/include/linux/module.h
>> +++ b/include/linux/module.h
>> @@ -347,7 +347,7 @@ struct module
>> unsigned int num_tracepoints;
>> #endif
>>
>> -#ifdef CONFIG_TRACE_BPRINTK
>> +#ifdef CONFIG_TRACING
>> const char **trace_bprintk_fmt_start;
>> unsigned int num_trace_bprintk_fmt;
>> #endif
>> diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
>> index 2e84fc7..52439c8 100644
>> --- a/kernel/trace/Kconfig
>> +++ b/kernel/trace/Kconfig
>> @@ -52,6 +52,7 @@ config TRACING
>> select STACKTRACE if STACKTRACE_SUPPORT
>> select TRACEPOINTS
>> select NOP_TRACER
>> + select BINARY_PRINTF
>>
>> menu "Tracers"
>>
>> @@ -86,12 +87,6 @@ config FUNCTION_GRAPH_TRACER
>> This is done by setting the current return address on the current
>> task structure into a stack of calls.
>>
>> -config TRACE_BPRINTK
>> - bool "Binary printk for tracing"
>> - default y
>> - depends on TRACING
>> - select BINARY_PRINTF
>> -
>> config IRQSOFF_TRACER
>> bool "Interrupts-off Latency Tracer"
>> default n
>> diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
>> index dba6157..25e243f 100644
>> --- a/kernel/trace/Makefile
>> +++ b/kernel/trace/Makefile
>> @@ -22,7 +22,7 @@ obj-$(CONFIG_TRACING) += trace.o
>> obj-$(CONFIG_TRACING) += trace_clock.o
>> obj-$(CONFIG_TRACING) += trace_output.o
>> obj-$(CONFIG_TRACING) += trace_stat.o
>> -obj-$(CONFIG_TRACE_BPRINTK) += trace_bprintk.o
>> +obj-$(CONFIG_TRACING) += trace_printk.o
>> obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
>> obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
>> obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
>> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
>> index 0e30dce..2ad285b 100644
>> --- a/kernel/trace/trace.c
>> +++ b/kernel/trace/trace.c
>> @@ -1171,6 +1171,67 @@ void trace_graph_return(struct ftrace_graph_ret *trace)
>> }
>> #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
>>
>> +
>> +/**
>> + * trace_vprintk - write binary msg to tracing buffer
>> + *
>> + * Caller must insure @fmt are valid when msg is in tracing buffer.
>> + */
>> +int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
>> +{
>> + static DEFINE_SPINLOCK(trace_buf_lock);
>> + static u32 trace_buf[TRACE_BUF_SIZE];
>> +
>> + struct ring_buffer_event *event;
>> + struct trace_array *tr = &global_trace;
>> + struct trace_array_cpu *data;
>> + struct print_entry *entry;
>> + unsigned long flags;
>> + int cpu, len = 0, size, pc;
>> +
>> + if (unlikely(tracing_selftest_running || tracing_disabled))
>> + return 0;
>> +
>> + /* Don't pollute graph traces with trace_vprintk internals */
>> + pause_graph_tracing();
>> +
>> + pc = preempt_count();
>> + preempt_disable_notrace();
>> + cpu = raw_smp_processor_id();
>> + data = tr->data[cpu];
>> +
>> + if (unlikely(atomic_read(&data->disabled)))
>> + goto out;
>> +
>> + spin_lock_irqsave(&trace_buf_lock, flags);
>> + len = vbin_printf(trace_buf, TRACE_BUF_SIZE, fmt, args);
>> +
>> + if (len > TRACE_BUF_SIZE || len < 0)
>> + goto out_unlock;
>> +
>> + size = sizeof(*entry) + sizeof(u32) * len;
>> + event = trace_buffer_lock_reserve(tr, TRACE_PRINT, size, flags, pc);
>> + if (!event)
>> + goto out_unlock;
>> + entry = ring_buffer_event_data(event);
>> + entry->ip = ip;
>> + entry->depth = depth;
>> + entry->fmt = fmt;
>> +
>> + memcpy(entry->buf, trace_buf, sizeof(u32) * len);
>> + ring_buffer_unlock_commit(tr->buffer, event);
>> +
>> +out_unlock:
>> + spin_unlock_irqrestore(&trace_buf_lock, flags);
>> +
>> +out:
>> + preempt_enable_notrace();
>> + unpause_graph_tracing();
>> +
>> + return len;
>> +}
>> +EXPORT_SYMBOL_GPL(trace_vprintk);
>> +
>> enum trace_file_type {
>> TRACE_FILE_LAT_FMT = 1,
>> TRACE_FILE_ANNOTATE = 2,
>> @@ -1588,7 +1649,7 @@ static enum print_line_t print_printk_msg_only(struct trace_iterator *iter)
>>
>> trace_assign_type(field, entry);
>>
>> - ret = trace_seq_printf(s, "%s", field->buf);
>> + ret = trace_seq_bprintf(s, field->fmt, field->buf);
>> if (!ret)
>> return TRACE_TYPE_PARTIAL_LINE;
>>
>> @@ -3496,152 +3557,6 @@ static __init int tracer_init_debugfs(void)
>> return 0;
>> }
>>
>> -int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
>> -{
>> - static DEFINE_SPINLOCK(trace_buf_lock);
>> - static char trace_buf[TRACE_BUF_SIZE];
>> -
>> - struct ring_buffer_event *event;
>> - struct trace_array *tr = &global_trace;
>> - struct trace_array_cpu *data;
>> - int cpu, len = 0, size, pc;
>> - struct print_entry *entry;
>> - unsigned long irq_flags;
>> -
>> - if (tracing_disabled || tracing_selftest_running)
>> - return 0;
>> -
>> - pc = preempt_count();
>> - preempt_disable_notrace();
>> - cpu = raw_smp_processor_id();
>> - data = tr->data[cpu];
>> -
>> - if (unlikely(atomic_read(&data->disabled)))
>> - goto out;
>> -
>> - pause_graph_tracing();
>> - spin_lock_irqsave(&trace_buf_lock, irq_flags);
>> - len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
>> -
>> - len = min(len, TRACE_BUF_SIZE-1);
>> - trace_buf[len] = 0;
>> -
>> - size = sizeof(*entry) + len + 1;
>> - event = trace_buffer_lock_reserve(tr, TRACE_PRINT, size, irq_flags, pc);
>> - if (!event)
>> - goto out_unlock;
>> - entry = ring_buffer_event_data(event);
>> - entry->ip = ip;
>> - entry->depth = depth;
>> -
>> - memcpy(&entry->buf, trace_buf, len);
>> - entry->buf[len] = 0;
>> - ring_buffer_unlock_commit(tr->buffer, event);
>> -
>> - out_unlock:
>> - spin_unlock_irqrestore(&trace_buf_lock, irq_flags);
>> - unpause_graph_tracing();
>> - out:
>> - preempt_enable_notrace();
>> -
>> - return len;
>> -}
>> -EXPORT_SYMBOL_GPL(trace_vprintk);
>> -
>> -int __ftrace_printk(unsigned long ip, const char *fmt, ...)
>> -{
>> - int ret;
>> - va_list ap;
>> -
>> - if (!(trace_flags & TRACE_ITER_PRINTK))
>> - return 0;
>> -
>> - va_start(ap, fmt);
>> - ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
>> - va_end(ap);
>> - return ret;
>> -}
>> -EXPORT_SYMBOL_GPL(__ftrace_printk);
>> -
>> -int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
>> -{
>> - if (!(trace_flags & TRACE_ITER_PRINTK))
>> - return 0;
>> -
>> - return trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
>> -}
>> -EXPORT_SYMBOL_GPL(__ftrace_vprintk);
>> -
>> -/**
>> - * trace_vbprintk - write binary msg to tracing buffer
>> - *
>> - * Caller must insure @fmt are valid when msg is in tracing buffer.
>> - */
>> -int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
>> -{
>> - static DEFINE_SPINLOCK(trace_buf_lock);
>> - static u32 trace_buf[TRACE_BUF_SIZE];
>> -
>> - struct ring_buffer_event *event;
>> - struct trace_array *tr = &global_trace;
>> - struct trace_array_cpu *data;
>> - struct bprintk_entry *entry;
>> - unsigned long flags;
>> - int cpu, len = 0, size, pc;
>> -
>> - if (tracing_disabled || !trace_bprintk_enable)
>> - return 0;
>> -
>> - pc = preempt_count();
>> - preempt_disable_notrace();
>> - cpu = raw_smp_processor_id();
>> - data = tr->data[cpu];
>> -
>> - if (unlikely(atomic_read(&data->disabled)))
>> - goto out;
>> -
>> - spin_lock_irqsave(&trace_buf_lock, flags);
>> - len = vbin_printf(trace_buf, TRACE_BUF_SIZE, fmt, args);
>> -
>> - if (len > TRACE_BUF_SIZE || len < 0)
>> - goto out_unlock;
>> -
>> - size = sizeof(*entry) + sizeof(u32) * len;
>> - event = trace_buffer_lock_reserve(tr, TRACE_BPRINTK, size, flags, pc);
>> - if (!event)
>> - goto out_unlock;
>> - entry = ring_buffer_event_data(event);
>> - entry->ip = ip;
>> - entry->fmt = fmt;
>> -
>> - memcpy(entry->buf, trace_buf, sizeof(u32) * len);
>> - ring_buffer_unlock_commit(tr->buffer, event);
>> -
>> -out_unlock:
>> - spin_unlock_irqrestore(&trace_buf_lock, flags);
>> -
>> -out:
>> - preempt_enable_notrace();
>> -
>> - return len;
>> -}
>> -EXPORT_SYMBOL_GPL(trace_vbprintk);
>> -
>> -int __ftrace_bprintk(unsigned long ip, const char *fmt, ...)
>> -{
>> - int ret;
>> - va_list ap;
>> -
>> - if (!fmt)
>> - return 0;
>> -
>> - va_start(ap, fmt);
>> - ret = trace_vbprintk(ip, fmt, ap);
>> - va_end(ap);
>> - return ret;
>> -}
>> -EXPORT_SYMBOL_GPL(__ftrace_bprintk);
>> -
>> static int trace_panic_handler(struct notifier_block *this,
>> unsigned long event, void *unused)
>> {
>> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
>> index 92703b1..0ccc678 100644
>> --- a/kernel/trace/trace.h
>> +++ b/kernel/trace/trace.h
>> @@ -20,7 +20,6 @@ enum trace_type {
>> TRACE_WAKE,
>> TRACE_STACK,
>> TRACE_PRINT,
>> - TRACE_BPRINTK,
>> TRACE_SPECIAL,
>> TRACE_MMIO_RW,
>> TRACE_MMIO_MAP,
>> @@ -120,16 +119,10 @@ struct userstack_entry {
>> */
>> struct print_entry {
>> struct trace_entry ent;
>> - unsigned long ip;
>> + unsigned long ip;
>> int depth;
>> - char buf[];
>> -};
>> -
>> -struct bprintk_entry {
>> - struct trace_entry ent;
>> - unsigned long ip;
>> - const char *fmt;
>> - u32 buf[];
>> + const char *fmt;
>> + u32 buf[];
>> };
>> #ifdef CONFIG_TRACE_BPRINTK
>> extern int trace_bprintk_enable;
>> @@ -295,7 +288,6 @@ extern void __ftrace_bad_type(void);
>> 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 bprintk_entry, TRACE_BPRINTK);\
>> IF_ASSIGN(var, ent, struct special_entry, 0); \
>> IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
>> TRACE_MMIO_RW); \
>> diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
>> index 2461732..13e362d 100644
>> --- a/kernel/trace/trace_functions_graph.c
>> +++ b/kernel/trace/trace_functions_graph.c
>> @@ -742,7 +742,11 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
>> }
>>
>> /* The comment */
>> - ret = trace_seq_printf(s, "/* %s", trace->buf);
>> + ret = trace_seq_printf(s, "/* ");
>> + if (!ret)
>> + return TRACE_TYPE_PARTIAL_LINE;
>> +
>> + ret = trace_seq_bprintf(s, trace->fmt, trace->buf);
>> if (!ret)
>> return TRACE_TYPE_PARTIAL_LINE;
>>
>> diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
>> index c401b90..23e346a 100644
>> --- a/kernel/trace/trace_mmiotrace.c
>> +++ b/kernel/trace/trace_mmiotrace.c
>> @@ -254,15 +254,18 @@ static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
>> {
>> struct trace_entry *entry = iter->ent;
>> struct print_entry *print = (struct print_entry *)entry;
>> - const char *msg = print->buf;
>> struct trace_seq *s = &iter->seq;
>> unsigned long long t = ns2usecs(iter->ts);
>> - unsigned long usec_rem = do_div(t, 1000000ULL);
>> + unsigned long usec_rem = do_div(t, USEC_PER_SEC);
>> unsigned secs = (unsigned long)t;
>> int ret;
>>
>> /* The trailing newline must be in the message. */
>> - ret = trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg);
>> + ret = trace_seq_printf(s, "MARK %u.%06lu ", secs, usec_rem);
>> + if (!ret)
>> + return TRACE_TYPE_PARTIAL_LINE;
>> +
>> + ret = trace_seq_bprintf(s, print->fmt, print->buf);
>> if (!ret)
>> return TRACE_TYPE_PARTIAL_LINE;
>>
>> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
>> index 7897b5d..a020a9b 100644
>> --- a/kernel/trace/trace_output.c
>> +++ b/kernel/trace/trace_output.c
>> @@ -53,8 +53,7 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
>> return len;
>> }
>>
>> -static int
>> -trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
>> +int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
>> {
>> int len = (PAGE_SIZE - 1) - s->len;
>> int ret;
>> @@ -876,50 +875,6 @@ static enum print_line_t trace_print_print(struct trace_iterator *iter,
>> if (!seq_print_ip_sym(s, field->ip, flags))
>> goto partial;
>>
>> - if (!trace_seq_printf(s, ": %s", field->buf))
>> - goto partial;
>> -
>> - return TRACE_TYPE_HANDLED;
>> -
>> - partial:
>> - return TRACE_TYPE_PARTIAL_LINE;
>> -}
>> -
>> -static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
>> -{
>> - struct print_entry *field;
>> -
>> - trace_assign_type(field, iter->ent);
>> -
>> - if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
>> - goto partial;
>> -
>> - return TRACE_TYPE_HANDLED;
>> -
>> - partial:
>> - return TRACE_TYPE_PARTIAL_LINE;
>> -}
>> -
>> -static struct trace_event trace_print_event = {
>> - .type = TRACE_PRINT,
>> - .trace = trace_print_print,
>> - .latency_trace = trace_print_print,
>> - .raw = trace_print_raw,
>> -};
>> -
>> -/* TRACE_BPRINTK */
>> -static enum print_line_t
>> -trace_bprintk_print(struct trace_iterator *iter, int flags)
>> -{
>> - struct trace_entry *entry = iter->ent;
>> - struct trace_seq *s = &iter->seq;
>> - struct bprintk_entry *field;
>> -
>> - trace_assign_type(field, entry);
>> -
>> - if (!seq_print_ip_sym(s, field->ip, flags))
>> - goto partial;
>> -
>> if (!trace_seq_puts(s, ": "))
>> goto partial;
>>
>> @@ -932,14 +887,13 @@ trace_bprintk_print(struct trace_iterator *iter, int flags)
>> return TRACE_TYPE_PARTIAL_LINE;
>> }
>>
>> -static enum print_line_t
>> -trace_bprintk_raw(struct trace_iterator *iter, int flags)
>> +
>> +static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
>> {
>> - struct trace_entry *entry = iter->ent;
>> + struct print_entry *field;
>> struct trace_seq *s = &iter->seq;
>> - struct bprintk_entry *field;
>>
>> - trace_assign_type(field, entry);
>> + trace_assign_type(field, iter->ent);
>>
>> if (!trace_seq_printf(s, ": %lx : ", field->ip))
>> goto partial;
>> @@ -953,13 +907,11 @@ trace_bprintk_raw(struct trace_iterator *iter, int flags)
>> return TRACE_TYPE_PARTIAL_LINE;
>> }
>>
>> -static struct trace_event trace_bprintk_event = {
>> - .type = TRACE_BPRINTK,
>> - .trace = trace_bprintk_print,
>> - .latency_trace = trace_bprintk_print,
>> - .raw = trace_bprintk_raw,
>> - .hex = trace_nop_print,
>> - .binary = trace_nop_print,
>> +static struct trace_event trace_print_event = {
>> + .type = TRACE_PRINT,
>> + .trace = trace_print_print,
>> + .latency_trace = trace_print_print,
>> + .raw = trace_print_raw,
>> };
>>
>> static struct trace_event *events[] __initdata = {
>> @@ -970,7 +922,6 @@ static struct trace_event *events[] __initdata = {
>> &trace_stack_event,
>> &trace_user_stack_event,
>> &trace_print_event,
>> - &trace_bprintk_event,
>> NULL
>> };
>>
>> diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
>> index 551a25a..6d39010 100644
>> --- a/kernel/trace/trace_output.h
>> +++ b/kernel/trace/trace_output.h
>> @@ -19,6 +19,8 @@ struct trace_event {
>> extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
>> __attribute__ ((format (printf, 2, 3)));
>> extern int
>> +trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
>> +extern int
>> seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
>> unsigned long sym_flags);
>> extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
>> diff --git a/kernel/trace/trace_bprintk.c b/kernel/trace/trace_printk.c
>> similarity index 65%
>> rename from kernel/trace/trace_bprintk.c
>> rename to kernel/trace/trace_printk.c
>> index 28e6286..09f4ace 100644
>> --- a/kernel/trace/trace_bprintk.c
>> +++ b/kernel/trace/trace_printk.c
>> @@ -21,32 +21,21 @@
>>
>> #ifdef CONFIG_MODULES
>>
>> -/* binary printk basic */
>> -static DEFINE_MUTEX(btrace_mutex);
>> -static int btrace_metadata_count;
>> /*
>> - * modules ftrace_bprintk()'s formats are autosaved in struct trace_bprintk_fmt
>> + * modules ftrace_printk()'s formats are autosaved in struct trace_bprintk_fmt
>> * which are queued on trace_bprintk_fmt_list.
>> */
>> static LIST_HEAD(trace_bprintk_fmt_list);
>>
>> +/* serialize accesses to trace_bprintk_fmt_list */
>> +static DEFINE_MUTEX(btrace_mutex);
>> +
>> struct trace_bprintk_fmt {
>> struct list_head list;
>> int count;
>> char fmt[0];
>> };
>>
>> -
>> -static inline void lock_btrace(void)
>> -{
>> - mutex_lock(&btrace_mutex);
>> -}
>> -
>> -static inline void unlock_btrace(void)
>> -{
>> - mutex_unlock(&btrace_mutex);
>> -}
>> -
>
> Heh, OK, you removed it ;-)
>
> -- Steve
>
>> /*
>> * If trace_bprintk() is not active, we release the trace_bprintk's
>> * formats that no modules has reference to.
>> @@ -76,7 +65,8 @@ static
>> void hold_module_trace_bprintk_format(const char **start, const char **end)
>> {
>> const char **iter;
>> - lock_btrace();
>> +
>> + mutex_lock(&btrace_mutex);
>> for (iter = start; iter < end; iter++) {
>> struct trace_bprintk_fmt *tb_fmt = lookup_format(*iter);
>> if (tb_fmt) {
>> @@ -95,14 +85,15 @@ void hold_module_trace_bprintk_format(const char **start, const char **end)
>> } else
>> *iter = NULL;
>> }
>> - unlock_btrace();
>> + mutex_unlock(&btrace_mutex);
>> }
>>
>> static
>> void release_module_trace_bprintk_format(const char **start, const char **end)
>> {
>> const char **iter;
>> - lock_btrace();
>> +
>> + mutex_lock(&btrace_mutex);
>> for (iter = start; iter < end; iter++) {
>> struct trace_bprintk_fmt *tb_fmt;
>> if (!*iter)
>> @@ -110,12 +101,12 @@ void release_module_trace_bprintk_format(const char **start, const char **end)
>>
>> tb_fmt = container_of(*iter, struct trace_bprintk_fmt, fmt[0]);
>> tb_fmt->count--;
>> - if (!tb_fmt->count && !btrace_metadata_count) {
>> + if (!tb_fmt->count) {
>> list_del(&tb_fmt->list);
>> kfree(tb_fmt);
>> }
>> }
>> - unlock_btrace();
>> + mutex_unlock(&btrace_mutex);
>> }
>>
>> static int module_trace_bprintk_format_notify(struct notifier_block *self,
>> @@ -134,24 +125,6 @@ static int module_trace_bprintk_format_notify(struct notifier_block *self,
>> return 0;
>> }
>>
>> -static void get_btrace_metadata(void)
>> -{
>> - lock_btrace();
>> - btrace_metadata_count++;
>> - unlock_btrace();
>> -}
>> -
>> -static void put_btrace_metadata(void)
>> -{
>> - lock_btrace();
>> - btrace_metadata_count--;
>> -
>> - if (!btrace_metadata_count) {
>> - shrink_trace_bprintk_fmt();
>> - }
>> - unlock_btrace();
>> -}
>> -
>> #else /* !CONFIG_MODULES */
>> __init static int
>> module_trace_bprintk_format_notify(struct notifier_block *self,
>> @@ -159,9 +132,6 @@ module_trace_bprintk_format_notify(struct notifier_block *self,
>> {
>> return 0;
>> }
>> -
>> -static inline void get_btrace_metadata(void) { }
>> -static inline void put_btrace_metadata(void) { }
>> #endif /* CONFIG_MODULES */
>>
>>
>> @@ -170,48 +140,39 @@ struct notifier_block module_trace_bprintk_format_nb = {
>> .notifier_call = module_trace_bprintk_format_notify,
>> };
>>
>> -/* events tracer */
>> -int trace_bprintk_enable;
>> -
>> -static void start_bprintk_trace(struct trace_array *tr)
>> +int __ftrace_printk(unsigned long ip, const char *fmt, ...)
>> {
>> - get_btrace_metadata();
>> - tracing_reset_online_cpus(tr);
>> - trace_bprintk_enable = 1;
>> -}
>> + int ret;
>> + va_list ap;
>>
>> -static void stop_bprintk_trace(struct trace_array *tr)
>> -{
>> - trace_bprintk_enable = 0;
>> - tracing_reset_online_cpus(tr);
>> - put_btrace_metadata();
>> -}
>> + if (unlikely(!fmt))
>> + return 0;
>>
>> -static int init_bprintk_trace(struct trace_array *tr)
>> -{
>> - start_bprintk_trace(tr);
>> - return 0;
>> + if (!(trace_flags & TRACE_ITER_PRINTK))
>> + return 0;
>> +
>> + va_start(ap, fmt);
>> + ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
>> + va_end(ap);
>> + return ret;
>> }
>> +EXPORT_SYMBOL_GPL(__ftrace_printk);
>>
>> -static struct tracer bprintk_trace __read_mostly =
>> +int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
>> {
>> - .name = "events",
>> - .init = init_bprintk_trace,
>> - .reset = stop_bprintk_trace,
>> - .start = start_bprintk_trace,
>> - .stop = stop_bprintk_trace,
>> -};
>> + if (unlikely(!fmt))
>> + return 0;
>>
>> -static __init int init_bprintk(void)
>> -{
>> - int ret = register_module_notifier(&module_trace_bprintk_format_nb);
>> - if (ret)
>> - return ret;
>> + if (!(trace_flags & TRACE_ITER_PRINTK))
>> + return 0;
>>
>> - ret = register_tracer(&bprintk_trace);
>> - if (ret)
>> - unregister_module_notifier(&module_trace_bprintk_format_nb);
>> - return ret;
>> + return trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
>> }
>> +EXPORT_SYMBOL_GPL(__ftrace_vprintk);
>> +
>>
>> -device_initcall(init_bprintk);
>> +static __init int init_trace_printk(void)
>> +{
>> + return register_module_notifier(&module_trace_bprintk_format_nb);
>> +}
>> +early_initcall(init_trace_printk);
>> --
>> 1.6.1
>>
>>
>>
>
--
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