From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Thu, 3 Jun 2010 10:26:24 +0000 (+0800)
Subject: tracing: Reduce latency and remove percpu trace_seq
X-Git-Tag: v2.6.36-rc1~532^2~27^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc289ae98b75d93228d24f521ef02a076e506e94;p=pandora-kernel.git

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>
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