ftrace: add ftrace_enabled sysctl to disable mcount function

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This patch adds back the sysctl ftrace_enabled. This time it is
defaulted to on, if DYNAMIC_FTRACE is configured. When ftrace_enabled
is disabled, the ftrace function is set to the stub return.

If DYNAMIC_FTRACE is also configured, on ftrace_enabled = 0,
the registered ftrace functions will all be set to jmps, but no more
new calls to ftrace recording (used to find the ftrace calling sites)
will be called.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Steven Rostedt 2008-05-12 21:20:43 +02:00 • committed by Thomas Gleixner

parent 3d0833953e

commit b0fc494fae

3 changed files with 124 additions and 18 deletions

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11

kernel/sysctl.c

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