我正在尝试在Ubuntu计算机上运行以下命令
root@manav-R761-c:/# ls -la /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
ls: cannot access /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger: No such file or directory
root@manav-R761-c:/#
root@manav-R761-c:/# echo 'hash:stacktrace:bytes_req,bytes_alloc' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
bash: /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger: Permission denied
我以root身份登录，为什么我无法创建触发器文件并写入？