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Dmesg collects too much log when kernel meets log storm. This patch reads kernel log from "/dev/kmsg" intead of dmesg and limits the generated log size. Tracked-On: #1024 Signed-off-by: Liu, Xinwu <xinwu.liu@intel.com> Reviewed-by: Zhi Jin <zhi.jin@intel.com> Acked-by: Chen, Gang <gang.c.chen@intel.com>