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perf, trace: Optimize tracepoints by using per-tracepoint-per-cpu hlist to track events

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Avoid the swevent hash-table by using per-tracepoint
hlists.

Also, avoid conditionals on the fast path by ordering
with probe unregister so that we should never get on
the callback path without the data being there.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20100521090710.473188012@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-05-19 14:02:22 +02:00
committed by Ingo Molnar
parent b7e2ecef92
commit 1c024eca51
7 changed files with 148 additions and 129 deletions
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16
include/linux/ftrace_event.h
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@@ -133,7 +133,7 @@ struct ftrace_event_call {
void *data;
int perf_refcount;
void *perf_data;
struct hlist_head *perf_events;
int (*perf_event_enable)(struct ftrace_event_call *);
void (*perf_event_disable)(struct ftrace_event_call *);
};
@@ -192,9 +192,11 @@ struct perf_event;
DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
extern int perf_trace_enable(int event_id, void *data);
extern void perf_trace_disable(int event_id);
extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
extern int perf_trace_init(struct perf_event *event);
extern void perf_trace_destroy(struct perf_event *event);
extern int perf_trace_enable(struct perf_event *event);
extern void perf_trace_disable(struct perf_event *event);
extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
char *filter_str);
extern void ftrace_profile_free_filter(struct perf_event *event);
extern void *perf_trace_buf_prepare(int size, unsigned short type,
@@ -202,11 +204,9 @@ extern void *perf_trace_buf_prepare(int size, unsigned short type,
static inline void
perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
u64 count, struct pt_regs *regs, void *event)
u64 count, struct pt_regs *regs, void *head)
{
struct trace_entry *entry = raw_data;
perf_tp_event(entry->type, addr, count, raw_data, size, regs, event);
perf_tp_event(addr, count, raw_data, size, regs, head);
perf_swevent_put_recursion_context(rctx);
}
#endif