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Re: Disabling skipping probes based on delays
- From: fche at redhat dot com (Frank Ch. Eigler)
- To: Darren Hart <dvhltc at us dot ibm dot com>
- Cc: systemtap at sourceware dot org
- Date: Wed, 27 Aug 2008 18:00:46 -0400
- Subject: Re: Disabling skipping probes based on delays
- References: <1219868613.22634.5.camel@Aeon>
Darren Hart <dvhltc@us.ibm.com> writes:
> I was hoping to use stap to simulate a scenario where only 25% of the
> CPU is available to the system. The best way we came up with to do this
> was to introduce a delay in the scheduler_tick. I have succeeded in
> adding a udelay() into the scheduler_tick via guru mode and embedded C.
Interesting approach.
> Unfortunately, stap bails out with the following message:
> WARNING: Number of errors: 0, skipped probes: 103
These could be due to locking timeouts, if your probes handlers
manipulate globals. You could try again with -DMAXSKIPPED=99999.
- FChE