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ftrace: mcount call site on boot nops core

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This is the infrastructure to the converting the mcount call sites
recorded by the __mcount_loc section into nops on boot. It also allows
for using these sites to enable tracing as normal. When the __mcount_loc
section is used, the "ftraced" kernel thread is disabled.

This uses the current infrastructure to record the mcount call sites
as well as convert them to nops. The mcount function is kept as a stub
on boot up and not converted to the ftrace_record_ip function. We use the
ftrace_record_ip to only record from the table.

This patch does not handle modules. That comes with a later patch.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2008-08-14 15:45:08 -04:00
committed by Ingo Molnar
parent 8da3821ba5
commit 68bf21aa15
4 changed files with 124 additions and 43 deletions
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6
include/linux/ftrace.h
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@@ -162,4 +162,10 @@ static inline void
ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
#endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
extern void ftrace_init(void);
#else
static inline void ftrace_init(void) { }
#endif
#endif /* _LINUX_FTRACE_H */