On Jun 25, 2013, at 5:25 AM, chris...@zoulas.com (Christos Zoulas) wrote: > On Jun 24, 6:12pm, m...@3am-software.com (Matt Thomas) wrote: > -- Subject: Re: DTrace syscall provider - please test/comment > > | > | On Jun 24, 2013, at 6:01 PM, Christos Zoulas <chris...@astron.com> wrote: > | > | > Can't this be done as an addition/enhancement to the trace_enter()/ > | > trace_exit() facility instead of having to enter each syscall entry? > | > | that only gets called if p->p_trace_enabled is set. So now you need > | a hook to set that on every lwp switch if the provider is tracing. > > Right, and it (dtrace) can set a different (or the same flag) to enable > it.
How does it set the same flag since that's per-proc and will need to changed on context switch. A different flag is more overhead per syscall.
