perf: split perf_trace_buf_prepare into alloc and update parts
split allows to move expensive update of 'struct trace_entry' to later phase. Repurpose unused 1st argument of perf_tp_event() to indicate event type. While splitting use temp variable 'rctx' instead of '*rctx' to avoid unnecessary loads done by the compiler due to -fno-strict-aliasing Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1016,7 +1016,7 @@ static inline bool perf_paranoid_kernel(void)
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}
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extern void perf_event_init(void);
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extern void perf_tp_event(u64 addr, u64 count, void *record,
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extern void perf_tp_event(u16 event_type, u64 count, void *record,
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int entry_size, struct pt_regs *regs,
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struct hlist_head *head, int rctx,
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struct task_struct *task);
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@ -605,15 +605,15 @@ extern void perf_trace_del(struct perf_event *event, int flags);
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extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
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char *filter_str);
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extern void ftrace_profile_free_filter(struct perf_event *event);
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extern void *perf_trace_buf_prepare(int size, unsigned short type,
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struct pt_regs **regs, int *rctxp);
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void perf_trace_buf_update(void *record, u16 type);
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void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);
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static inline void
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perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
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perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
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u64 count, struct pt_regs *regs, void *head,
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struct task_struct *task)
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{
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perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task);
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perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
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}
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#endif
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@ -53,8 +53,7 @@ perf_trace_##call(void *__data, proto) \
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sizeof(u64)); \
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__entry_size -= sizeof(u32); \
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\
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entry = perf_trace_buf_prepare(__entry_size, \
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event_call->event.type, &__regs, &rctx); \
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entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx); \
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if (!entry) \
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return; \
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\
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@ -64,8 +63,9 @@ perf_trace_##call(void *__data, proto) \
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\
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{ assign; } \
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\
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perf_trace_buf_submit(entry, __entry_size, rctx, 0, \
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__count, __regs, head, __task); \
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perf_trace_buf_submit(entry, __entry_size, rctx, \
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event_call->event.type, __count, __regs, \
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head, __task); \
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}
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/*
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@ -6987,7 +6987,7 @@ static int perf_tp_event_match(struct perf_event *event,
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return 1;
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}
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void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
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void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
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struct pt_regs *regs, struct hlist_head *head, int rctx,
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struct task_struct *task)
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{
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@ -6999,9 +6999,11 @@ void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
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.data = record,
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};
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perf_sample_data_init(&data, addr, 0);
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perf_sample_data_init(&data, 0, 0);
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data.raw = &raw;
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perf_trace_buf_update(record, event_type);
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hlist_for_each_entry_rcu(event, head, hlist_entry) {
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if (perf_tp_event_match(event, &data, regs))
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perf_swevent_event(event, count, &data, regs);
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@ -260,42 +260,43 @@ void perf_trace_del(struct perf_event *p_event, int flags)
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tp_event->class->reg(tp_event, TRACE_REG_PERF_DEL, p_event);
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}
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void *perf_trace_buf_prepare(int size, unsigned short type,
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struct pt_regs **regs, int *rctxp)
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void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp)
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{
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struct trace_entry *entry;
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unsigned long flags;
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char *raw_data;
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int pc;
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int rctx;
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BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long));
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if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
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"perf buffer not large enough"))
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"perf buffer not large enough"))
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return NULL;
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pc = preempt_count();
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*rctxp = perf_swevent_get_recursion_context();
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if (*rctxp < 0)
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*rctxp = rctx = perf_swevent_get_recursion_context();
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if (rctx < 0)
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return NULL;
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if (regs)
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*regs = this_cpu_ptr(&__perf_regs[*rctxp]);
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raw_data = this_cpu_ptr(perf_trace_buf[*rctxp]);
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*regs = this_cpu_ptr(&__perf_regs[rctx]);
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raw_data = this_cpu_ptr(perf_trace_buf[rctx]);
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/* zero the dead bytes from align to not leak stack to user */
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memset(&raw_data[size - sizeof(u64)], 0, sizeof(u64));
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return raw_data;
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}
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EXPORT_SYMBOL_GPL(perf_trace_buf_alloc);
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NOKPROBE_SYMBOL(perf_trace_buf_alloc);
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void perf_trace_buf_update(void *record, u16 type)
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{
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struct trace_entry *entry = record;
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int pc = preempt_count();
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unsigned long flags;
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entry = (struct trace_entry *)raw_data;
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local_save_flags(flags);
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tracing_generic_entry_update(entry, flags, pc);
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entry->type = type;
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return raw_data;
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}
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EXPORT_SYMBOL_GPL(perf_trace_buf_prepare);
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NOKPROBE_SYMBOL(perf_trace_buf_prepare);
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NOKPROBE_SYMBOL(perf_trace_buf_update);
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#ifdef CONFIG_FUNCTION_TRACER
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static void
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@ -319,13 +320,13 @@ perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip,
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memset(®s, 0, sizeof(regs));
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perf_fetch_caller_regs(®s);
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entry = perf_trace_buf_prepare(ENTRY_SIZE, TRACE_FN, NULL, &rctx);
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entry = perf_trace_buf_alloc(ENTRY_SIZE, NULL, &rctx);
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if (!entry)
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return;
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entry->ip = ip;
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entry->parent_ip = parent_ip;
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perf_trace_buf_submit(entry, ENTRY_SIZE, rctx, 0,
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perf_trace_buf_submit(entry, ENTRY_SIZE, rctx, TRACE_FN,
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1, ®s, head, NULL);
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#undef ENTRY_SIZE
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@ -1149,14 +1149,15 @@ kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
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size = ALIGN(__size + sizeof(u32), sizeof(u64));
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size -= sizeof(u32);
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entry = perf_trace_buf_prepare(size, call->event.type, NULL, &rctx);
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entry = perf_trace_buf_alloc(size, NULL, &rctx);
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if (!entry)
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return;
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entry->ip = (unsigned long)tk->rp.kp.addr;
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memset(&entry[1], 0, dsize);
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store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
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perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
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perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
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head, NULL);
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}
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NOKPROBE_SYMBOL(kprobe_perf_func);
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@ -1184,14 +1185,15 @@ kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
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size = ALIGN(__size + sizeof(u32), sizeof(u64));
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size -= sizeof(u32);
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entry = perf_trace_buf_prepare(size, call->event.type, NULL, &rctx);
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entry = perf_trace_buf_alloc(size, NULL, &rctx);
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if (!entry)
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return;
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entry->func = (unsigned long)tk->rp.kp.addr;
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entry->ret_ip = (unsigned long)ri->ret_addr;
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store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
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perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
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perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
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head, NULL);
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}
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NOKPROBE_SYMBOL(kretprobe_perf_func);
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#endif /* CONFIG_PERF_EVENTS */
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@ -587,15 +587,16 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
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size = ALIGN(size + sizeof(u32), sizeof(u64));
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size -= sizeof(u32);
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rec = (struct syscall_trace_enter *)perf_trace_buf_prepare(size,
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sys_data->enter_event->event.type, NULL, &rctx);
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rec = perf_trace_buf_alloc(size, NULL, &rctx);
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if (!rec)
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return;
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rec->nr = syscall_nr;
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syscall_get_arguments(current, regs, 0, sys_data->nb_args,
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(unsigned long *)&rec->args);
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perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head, NULL);
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perf_trace_buf_submit(rec, size, rctx,
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sys_data->enter_event->event.type, 1, regs,
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head, NULL);
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}
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static int perf_sysenter_enable(struct trace_event_call *call)
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size = ALIGN(sizeof(*rec) + sizeof(u32), sizeof(u64));
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size -= sizeof(u32);
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rec = (struct syscall_trace_exit *)perf_trace_buf_prepare(size,
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sys_data->exit_event->event.type, NULL, &rctx);
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rec = perf_trace_buf_alloc(size, NULL, &rctx);
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if (!rec)
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return;
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rec->nr = syscall_nr;
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rec->ret = syscall_get_return_value(current, regs);
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perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head, NULL);
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perf_trace_buf_submit(rec, size, rctx, sys_data->exit_event->event.type,
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1, regs, head, NULL);
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}
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static int perf_sysexit_enable(struct trace_event_call *call)
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@ -1131,7 +1131,7 @@ static void __uprobe_perf_func(struct trace_uprobe *tu,
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if (hlist_empty(head))
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goto out;
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entry = perf_trace_buf_prepare(size, call->event.type, NULL, &rctx);
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entry = perf_trace_buf_alloc(size, NULL, &rctx);
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if (!entry)
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goto out;
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@ -1152,7 +1152,8 @@ static void __uprobe_perf_func(struct trace_uprobe *tu,
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memset(data + len, 0, size - esize - len);
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}
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perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
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perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
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head, NULL);
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out:
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preempt_enable();
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}
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