Messages in this thread | | | Date | Thu, 29 Aug 2002 14:22:12 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] low-latency zap_page_range() |
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Robert Love wrote: > > On Thu, 2002-08-29 at 17:00, Andrew Morton wrote: > > > That's an interesting point. page_table_lock is one of those locks > > which is occasionally held for ages, and frequently held for a short > > time. > > Since latency is a direct function of lock held times in the preemptible > kernel, and I am seeing disgusting zap_page_range() latencies, the lock > is held a long time. > > So we know it is held forever and a day... but is there contention?
I'm sure there is, but nobody has measured the right workload.
Two CLONE_MM threads, one running mmap()/munmap(), the other trying to fault in some pages. I'm sure someone has some vital application which does exactly this. They always do :( - 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/
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