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Re: About last_tsk in _stp_module_relocate

From: fche at redhat dot com (Frank Ch. Eigler)
To: Mark Wielaard <mjw at redhat dot com>
Cc: Wenji Huang <wenji dot huang at oracle dot com>, systemtap at sourceware dot org
Date: Tue, 29 Dec 2009 11:42:53 -0500
Subject: Re: About last_tsk in _stp_module_relocate
References: <0651a92d-b229-450b-bd06-7d9525c82811@default> <1262072112.15393.6.camel@hermans.wildebeest.org>

Mark Wielaard <mjw@redhat.com> writes:

> [...]
> I wasn't sure _stp_module_relocate couldn't be called simultaneously
> from different threads/cpus. If it can then this caching might not be
> safe.

When it applied to only kernel modules, it was safe, since it was only
used during script module initialization.  Now that it's used for
userspace too, the caching has to be made smp-safe or just removed.

- FChE

Follow-Ups:
- Re: About last_tsk in _stp_module_relocate
  - From: Mark Wielaard

References:
- About last_tsk in _stp_module_relocate
  - From: Wenji Huang
- Re: About last_tsk in _stp_module_relocate
  - From: Mark Wielaard

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