Messages in this thread | | | Date | Fri, 17 Sep 2004 08:43:21 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] remove the BKL (Big Kernel Lock), this time for real |
| |
* Bill Huey <bhuey@lnxw.com> wrote:
> Judging from how the Linux code is done and the numbers I get from > Bill Irwin in casual conversation, the Linux SMP approach is clearly > the right track at this time with it's hand honed per-CPU awareness of > things. The only serious problem that spinlocks have as they aren't > preemptable, which is what Ingo is trying to fix.
a clarification: note that the current BKL is a special case. No way do i suggest that the BKS is the proper model for any SMP implementation. It is a narrow special-case because it wraps historic UP-only kernel code.
our primary multiprocessing primitives are still the following 4: lockless data structures, RCU, spinlocks and mutexes. (reverse ordered by level of parallelism.) The BKS is basically a fifth method, a special type of semaphore that i'd never want to be seen used by any new SMP code. It is completely local to sched.c.
Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |