diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-05-19 14:02:22 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-21 11:37:56 +0200 |
| commit | 1c024eca51fdc965290acf342ae16a476c2189d0 (patch) | |
| tree | 28dc160cc70a20eeb8b8825d6d52ea88a6188413 /kernel/trace/trace_syscalls.c | |
| parent | b7e2ecef92d2e7785e6d76b41e5ba8bcbc45259d (diff) | |
perf, trace: Optimize tracepoints by using per-tracepoint-per-cpu hlist to track events
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>
Diffstat (limited to 'kernel/trace/trace_syscalls.c')
| -rw-r--r-- | kernel/trace/trace_syscalls.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index a657cefbb13..eb769f27029 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -438,6 +438,7 @@ static void perf_syscall_enter(struct pt_regs *regs, long id) { struct syscall_metadata *sys_data; struct syscall_trace_enter *rec; + struct hlist_head *head; int syscall_nr; int rctx; int size; @@ -467,8 +468,9 @@ 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, regs, - sys_data->enter_event->perf_data); + + head = per_cpu_ptr(sys_data->enter_event->perf_events, smp_processor_id()); + perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head); } int perf_sysenter_enable(struct ftrace_event_call *call) @@ -510,6 +512,7 @@ static void perf_syscall_exit(struct pt_regs *regs, long ret) { struct syscall_metadata *sys_data; struct syscall_trace_exit *rec; + struct hlist_head *head; int syscall_nr; int rctx; int size; @@ -542,8 +545,8 @@ 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, regs, - sys_data->exit_event->perf_data); + head = per_cpu_ptr(sys_data->exit_event->perf_events, smp_processor_id()); + perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head); } int perf_sysexit_enable(struct ftrace_event_call *call) |