> We can reproduce the soft lockup issue now and root cause the issue as well. > > Since the ptc.g patch uses semaphore ptcg_sem to serialize multiple > ptc.g instructions in ia64_global_tlb_purge(). This requires the code > path should be safe to sleep in down(). But the code path can not > sleep during swap because it holds some spin locks (e.g. anon_vma_lock). > Going to sleep finally causes soft lockup. I've just pushed a new version of this patch into my test tree (so it will show up in -mm and linux-next when they pull and rebuild). It now uses the Piggin/Wilcox "spinaphore" primitives. It passes all my tests, and some runs of "hackbench" that tried to match the tests that failed before at Fujitsu by forcing moderate amounts of swapping. -Tony -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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