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tracing/fastboot: Enable boot tracing only during initcalls

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Impact: modify boot tracer

We used to disable the initcall tracing at a specified time (IE: end
of builtin initcalls). But we don't need it anymore. It will be
stopped when initcalls are finished.

However we want two things:

_Start this tracing only after pre-smp initcalls are finished.

_Since we are planning to trace sched_switches at the same time, we
want to enable them only during the initcall execution.

For this purpose, this patch introduce two functions to enable/disable
the sched_switch tracing during boot.

Signed-off-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Frederic Weisbecker 2008-10-31 12:57:20 +01:00 • committed by Ingo Molnar
commit 71566a0d16
3 changed files with 41 additions and 15 deletions
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4
init/main.c
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@ -711,6 +711,7 @@ int do_one_initcall(initcall_t fn)
it.caller = task_pid_nr(current);
printk("calling %pF @ %i\n", fn, it.caller);
it.calltime = ktime_get();
enable_boot_trace();
}
it.result = fn();
@ -722,6 +723,7 @@ int do_one_initcall(initcall_t fn)
printk("initcall %pF returned %d after %Ld usecs\n", fn,
it.result, it.duration);
trace_boot(&it, fn);
disable_boot_trace();
}
msgbuf[0] = 0;
@ -882,7 +884,7 @@ static int __init kernel_init(void * unused)
* we're essentially up and running. Get rid of the
* initmem segments and start the user-mode stuff..
*/
stop_boot_trace();
init_post();
return 0;
}