tracing/function-graph-tracer: append the tracing_graph_flag

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Impact: Provide a way to pause the function graph tracer

As suggested by Steven Rostedt, the previous patch that prevented from
spinlock function tracing shouldn't use the raw_spinlock to fix it.
It's much better to follow lockdep with normal spinlock, so this patch
adds a new flag for each task to make the function graph tracer able
to be paused. We also can send an ftrace_printk whithout worrying of
the irrelevant traced spinlock during insertion.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Frederic Weisbecker 2008-12-06 03:43:41 +01:00 • committed by Ingo Molnar

parent 8e1b82e086

commit 380c4b1411

5 changed files with 26 additions and 14 deletions

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5

arch/x86/kernel/ftrace.c

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13

include/linux/ftrace.h

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2

include/linux/sched.h

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2

kernel/trace/ftrace.c

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18

kernel/trace/trace.c

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