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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-05-18 16:08:32 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2010-05-18 16:35:46 (GMT) |
commit | 4f41c013f553957765902fb01475972f0af3e8e7 (patch) | |
tree | ddaa54947cc990094a4b270f2f8b3d6da195044f /kernel/trace | |
parent | ef4f30f54e265c2f6f9ac9eda4db158a4e16050b (diff) | |
download | linux-4f41c013f553957765902fb01475972f0af3e8e7.tar.xz |
perf/ftrace: Optimize perf/tracepoint interaction for single events
When we've got but a single event per tracepoint
there is no reason to try and multiplex it so don't.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
-rw-r--r-- | kernel/trace/trace_event_perf.c | 11 | ||||
-rw-r--r-- | kernel/trace/trace_kprobe.c | 4 | ||||
-rw-r--r-- | kernel/trace/trace_syscalls.c | 6 |
3 files changed, 13 insertions, 8 deletions
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c index 0565bb4..89b780a 100644 --- a/kernel/trace/trace_event_perf.c +++ b/kernel/trace/trace_event_perf.c @@ -27,13 +27,15 @@ typedef typeof(unsigned long [PERF_MAX_TRACE_SIZE / sizeof(unsigned long)]) /* Count the events in use (per event id, not per instance) */ static int total_ref_count; -static int perf_trace_event_enable(struct ftrace_event_call *event) +static int perf_trace_event_enable(struct ftrace_event_call *event, void *data) { char *buf; int ret = -ENOMEM; - if (event->perf_refcount++ > 0) + if (event->perf_refcount++ > 0) { + event->perf_data = NULL; return 0; + } if (!total_ref_count) { buf = (char *)alloc_percpu(perf_trace_t); @@ -51,6 +53,7 @@ static int perf_trace_event_enable(struct ftrace_event_call *event) ret = event->perf_event_enable(event); if (!ret) { + event->perf_data = data; total_ref_count++; return 0; } @@ -68,7 +71,7 @@ fail_buf: return ret; } -int perf_trace_enable(int event_id) +int perf_trace_enable(int event_id, void *data) { struct ftrace_event_call *event; int ret = -EINVAL; @@ -77,7 +80,7 @@ int perf_trace_enable(int event_id) list_for_each_entry(event, &ftrace_events, list) { if (event->id == event_id && event->perf_event_enable && try_module_get(event->mod)) { - ret = perf_trace_event_enable(event); + ret = perf_trace_event_enable(event, data); break; } } diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index a751432..2d7bf41 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1362,7 +1362,7 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp, for (i = 0; i < tp->nr_args; i++) call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset); - perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, irq_flags, regs); + perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, irq_flags, regs, call->perf_data); } /* Kretprobe profile handler */ @@ -1395,7 +1395,7 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri, call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset); perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, - irq_flags, regs); + irq_flags, regs, call->perf_data); } static int probe_perf_enable(struct ftrace_event_call *call) diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 4d6d711..9eff1a4 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -468,7 +468,8 @@ static void perf_syscall_enter(struct pt_regs *regs, long id) rec->nr = syscall_nr; syscall_get_arguments(current, regs, 0, sys_data->nb_args, (unsigned long *)&rec->args); - perf_trace_buf_submit(rec, size, rctx, 0, 1, flags, regs); + perf_trace_buf_submit(rec, size, rctx, 0, 1, flags, regs, + sys_data->enter_event->perf_data); } int perf_sysenter_enable(struct ftrace_event_call *call) @@ -543,7 +544,8 @@ static void perf_syscall_exit(struct pt_regs *regs, long ret) rec->nr = syscall_nr; rec->ret = syscall_get_return_value(current, regs); - perf_trace_buf_submit(rec, size, rctx, 0, 1, flags, regs); + perf_trace_buf_submit(rec, size, rctx, 0, 1, flags, regs, + sys_data->exit_event->perf_data); } int perf_sysexit_enable(struct ftrace_event_call *call) |