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Re: getiobuf(x, false) can sleep ?
On Fri, Apr 02, 2010 at 06:30:30PM +0900, enami tsugutomo wrote:
> > When called this way getiobuf() will do pool_cache_get(bufio_cache,
> > PR_NOWAIT). Does anyone see if this can sleep somewhere despite the
> > PR_NOWAIT ?
>
> The mutex_enter() in the pool_cache_get_slow()?
This cache won't sleep if PR_NOWAIT, it's interrupt safe.
You could verify the context switch theory using something like:
uint64_t pctr;
kpreempt_disable();
pctr = lwp_pctr();
/* do stuff */
KASSERT(pctr == lwp_pctr()); /* check for context switch */
kpreempt_enable();
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