> >>>>> Chris Wedgwood wrote on Fri, March 26, 2004 3:41 PM > > Does anyone have any idea what locks are most heavily contented for > > ia64 right now? > > This question is a bit too broad, lock contention highly depends on workload. I totally agree. On one AIM7-like workload that I'm using, at 64p the dominant contention is doing pte_chain_lock() in page_remove_rmap() (11% of the cycles) and page_add_rmap() (5%). That's not spinlock contention -- it's cacheline contention. That same workload at 96p shows about 47% of the kernel cycles in find_get_page() doing the spin_lock(mapping->page_lock), and the pte_chain_lock() bottleneck has faded into insignificance. John Hawkes - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.htmlReceived on Sat Mar 27 21:39:35 2004
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