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Re: trace spinlock

From: Roland McGrath <roland at redhat dot com>
To: Zhiwei Ying <zhiwei dot ying at gmail dot com>
Cc: systemtap at sources dot redhat dot com
Date: Wed, 25 Aug 2010 23:56:59 -0700 (PDT)
Subject: Re: trace spinlock
References: <AANLkTik_GbtmqW7R-Y6pZLC0dRRG6afEF6=nZc-DsmFs@mail.gmail.com>

> I am trying to trace the spinlock/spinunlock, but there is something
> weired in the output. In some cases, the parm of spinlock becomes "?"
> Does anyone know what's reason? And how to fix this?

That means the variables were not available in those probe sites.
Try -vvv and look for "variable location problem" messages.


Thanks,
Roland

References:
- trace spinlock
  - From: Zhiwei Ying

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