From: Naruto Nguyen <narutonguyen2018@gmail.com>
To: kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: How to debug high sysload in 2,3 second
Date: Mon, 15 May 2023 18:58:33 +1000 [thread overview]
Message-ID: <CANpxKHGB8Q+98Vt8K85EMVnCBc4pzc85qhhmqmvEi6ZXHkW1Ww@mail.gmail.com> (raw)
Hi everyone,
My system during idle sometimes has high sysload in 2,3 seconds
(around 70% sysload) and then come back to normal after that. I see it
happen in some conditions and try to use top commands to debug and see
one of processes in my system consume CPU.
I would like to investigate more what code causes CPU high. However
the spike only happens 2,3 seconds so I have no ideas to continue
debugging. I thought about perf tool, but I am not sure how to profile
with perf to identify exactly what happens in 2,3 seconds during high
CPU. Because I can reproduce the issue to see it, but only during 3 or
4 minutes, I can see CPU increase in 2,3 seconds. So I worry that
using perf to profile in 3,4 minutes cannot identify the code causing
CPU increase in a short time.
Could you help to advise how I can debug in this case?
Thanks,
Brs,
Naruto
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next reply other threads:[~2023-05-15 9:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-15 8:58 Naruto Nguyen [this message]
2023-05-16 10:44 ` How to debug high sysload in 2,3 second Valdis Klētnieks
2023-05-16 21:44 ` Valentin Vidić
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