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Date: Fri, 4 Apr 2008 16:52:29 -0700 From: "Luck, Tony" <tony.luck@...el.com> To: "Yu, Fenghua" <fenghua.yu@...el.com>, "KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com> Cc: "LKML" <linux-kernel@...r.kernel.org>, <linux-ia64@...r.kernel.org>, "Hidetoshi Seto" <seto.hidetoshi@...fujitsu.com>, "Andrew Morton" <akpm@...ux-foundation.org> Subject: RE: [2.6.25-rc5-mm1][regression] ia64: hackbench doesn't finish >12 hour > 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-kernel" in the body of a message to majordomo@...r.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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