使用统计执行分析器OProfile可视化我的C应用程序的调用图配置文件时,它会多次包含以下警告.警告对我来说相当神秘:
warning: dropping hyperspace sample at offset 1af9 >= 2be8 for binary /home/myuser/mybinary
我在Xen虚拟化环境中使用OProfile,如下所示:
modprobe oprofile timer=1
opcontrol --no-vmlinux
opcontrol --start
(wait for profiling data to accumulate)
opcontrol --stop
opreport --session-dir=/var/lib/oprofile --exclude-dependent --demangle=smart \
--symbols /home/myuser/mybinary --callgraph
最后一个命令的完整输出是:
Overflow stats not available
CPU: CPU with timer interrupt, speed 0 MHz (estimated)
Profiling through timer interrupt
warning: dropping hyperspace sample at offset 84d0 >= 79a0 for binary /home/myuser/mybinary
warning: dropping hyperspace sample at offset 7ac0 >= 79a0 for binary /home/myuser/mybinary
warning: …