On Thu, 14 Sep 2006 18:28:05 +0100, Ralf Baechle <ralf@xxxxxxxxxxxxxx> wrote:
> > Add special short path for emulationg RDHWR which is used to support
> > TLS. The handle_tlbl synthesizer takes a care for
> > cpu_has_vtag_icache.
>
> I'm just wondering if we actually need such optimizations. Have you ran
> any application benchmarks?
I've measured time of NPTL pthread_mutex_lock/pthread_mutex_unlock loop.
pthread_mutex_init(&m, NULL);
gettimeofday(&start, NULL);
for (i = 0; i < 1000000; i++) {
pthread_mutex_lock(&m);
pthread_mutex_unlock(&m);
}
gettimeofday(&end, NULL);
Without optimization:
0.826407 sec / 1000000 loop
With optimization:
0.415667 sec / 1000000 loop
It would be worth to do.
---
Atsushi Nemoto
