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Re: Possible performance bug



On Thu, Sep 08, 2005 at 04:31:02PM -0700, Chris Wright wrote:
> * Steve Grubb (sgrubb redhat com) wrote:
> > Don't all the running processes still have a context?
> 
> Already running processes would (except those with 'never' rules), but
> news ones shouldn't (new meaning after -e0).  It seems odd a benchmark
> that runs after -e0 (that's creating only new processes) would be that
> penalized.  New processes would have no context, and existing processes
> would bail out of audit_syscall_entry.  Profiles would be helpful.

The TIF_SYSCALL_AUDIT flag isn't explicitly cleared in copy_process,
so it continues to be propagated to new tasks once audit has been
enabled, regardless of the current value of the audit_enabled flag.
After -e0, new tasks still incur some extra overhead from trace
syscall processing instead of jumping out early.  It would be
interesting to see some numbers on that.

Amy


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