lttng: timing calibration feature (da66e4e5) · Commits · 戴 / test

This calibration feature is fairly limited for now, but provides an example of how this can be performed. Signed-off-by:

drivers/staging/lttng/lttng-calibrate.c

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		/*
		* lttng-calibrate.c
		*
		* Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
		*
		* LTTng probe calibration.
		*
		* Dual LGPL v2.1/GPL v2 license.
		*/

		#include "ltt-debugfs-abi.h"
		#include "ltt-events.h"

		noinline
		void lttng_calibrate_kretprobe(void)
		{
		asm volatile ("");
		}

		int lttng_calibrate(struct lttng_kernel_calibrate *calibrate)
		{
		switch (calibrate->type) {
		case LTTNG_KERNEL_CALIBRATE_KRETPROBE:
		lttng_calibrate_kretprobe();
		break;
		default:
		return -EINVAL;
		}
		return 0;
		}