terminate called after throwing an instance of 'std::experimental::filesystem::v1::__cxx11::filesystem_error' what(): filesystem error: directory iterator cannot open directory: No such file or directory [/sys/kernel/debug/tracing/events/syscalls] Activity Sign up for free to join this co...
主要用来梳理内核模块的逻辑 二 使用 （1）function 使用 /sys/kernel/debug/tracing # echo nop > c...
linux 错误挂载“/sys/kernel/debug/tracing”到rootfs您的容器位于自己的独立文件系统中，当它试图访问/...
echo'myevent u64 lat; char name[]'>> synthetic_events//【作用?】 二、实验 1. events 的 trigger 文件 /sys/kernel/tracing/events/sched/sched_blocked_reason # cat trigger # Available triggers: # traceon traceoff stacktrace enable_event disable_event enable_hist disable_hist hist/sys/kernel/...
sys_enter_openat是linux tracepoint的名字,比较稳定的ABI函数,可以在/sys/kernel/debug/tracing/events/ 找到。总数在 perf list|wc -l 约1800多个。 kprobe attach到__x64_sys_openat 需要结合CO-RE来解决不同版本内核导致的函数(__64_sys_openat)名字或参数变化的问题。 hook到tracepoint并不总是可能的,因...
Our monitoring detected something weird about /sys/kernel/debug/tracing/, saying that it's not accessible by the monitoring user (nrpe)? Why the permission of directory /sys/kernel/debug/tracing is 700 in RHEL8/9 while it was 755 in RHEL7?
lsof: WARNING: can't stat() tracefs file system /sys/kernel/debug/tracing Output information may be incomplete. Environment Red Hat Enterprise Linux 8. Red Hat Enterprise Linux 9. Subscriber exclusive content A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much ...
7-143 agent[9039]: 2020-02-07 17:13:49 UTC | CORE | WARN | (pkg/collector/python/datadog_agent.go:118 in LogMessage) | disk:e5dffb8bef24336f | (disk.py:75) | Unable to get disk metrics for /sys/kernel/debug/tracing: [Errno 13] Permission denied: '/sys/kernel/debug/tracing'...
APP 进行全面的监测和绕过。本文即为对这类方案的一些探索和实践。
基于ftrace框架实现,内核中的所有tracepoint都可以作为perf都性能事件cat /sys/kernel/debug/tracing/available_events,可查看当前系统的所有tracepoint分成了几大类: ext4 文件系统的tracepoint events,如果是其它文件系统,比如XFS,也有对应的tracepoint event; ...