| commit | bc289ae98b75d93228d24f521ef02a076e506e94 | |
| author | Lai Jiangshan <laijs@cn.fujitsu.com> | |
| Thu, 3 Jun 2010 10:26:24 +0000 (3 18:26 +0800) | ||
| committer | Steven Rostedt <rostedt@goodmis.org> | |
| Wed, 21 Jul 2010 02:05:34 +0000 (20 22:05 -0400) | ||
| tree | 50d151d0fbde1b106932c0f80a2639839d261ca3 | treesnapshot (tar.gz zip) |
| parent | 985023dee6e212493831431ba2e3ce8918f001b2 | commitdiff |
tracing: Reduce latency and remove percpu trace_seq
__print_flags() and __print_symbolic() use percpu trace_seq:
1) Its memory is allocated at compile time, it wastes memory if we don't use tracing.
2) It is percpu data and it wastes more memory for multi-cpus system.
3) It disables preemption when it executes its core routine
"trace_seq_printf(s, "%s: ", #call);" and introduces latency.
So we move this trace_seq to struct trace_iterator.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4C078350.7090106@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
__print_flags() and __print_symbolic() use percpu trace_seq:
1) Its memory is allocated at compile time, it wastes memory if we don't use tracing.
2) It is percpu data and it wastes more memory for multi-cpus system.
3) It disables preemption when it executes its core routine
"trace_seq_printf(s, "%s: ", #call);" and introduces latency.
So we move this trace_seq to struct trace_iterator.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4C078350.7090106@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| include/linux/ftrace_event.h | diffblobblamehistory | |
| include/trace/ftrace.h | diffblobblamehistory | |
| kernel/trace/trace_output.c | diffblobblamehistory |