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perf/ftrace: Optimize perf/tracepoint interaction for single events

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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>
This commit is contained in:
Peter Zijlstra
2010-05-18 18:08:32 +02:00
committed by Ingo Molnar
parent ef4f30f54e
commit 4f41c013f5
7 changed files with 31 additions and 18 deletions
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6
kernel/trace/trace_syscalls.c
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@@ -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)