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ftrace: user raw_spin_lock in tracing

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Lock debugging enabled cause huge performance problems for tracing. Having
the lock verification happening for every function that is called
because mcount calls spin_lock can cripple the system.

This patch converts the spin_locks used by ftrace into raw_spin_locks.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Steven Rostedt
2008-05-12 21:20:55 +02:00
committed by Thomas Gleixner
parent c5f888cae4
commit 92205c2343
2 changed files with 31 additions and 22 deletions
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2
kernel/trace/trace.h
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@@ -76,7 +76,7 @@ struct trace_entry {
struct trace_array_cpu {
struct list_head trace_pages;
atomic_t disabled;
spinlock_t lock;
raw_spinlock_t lock;
struct lock_class_key lock_key;
/* these fields get copied into max-trace: */