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Open Source and information security mailing list archives
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Date: Fri, 19 Aug 2011 16:30:22 -0700 From: Andi Kleen <andi@...stfloor.org> To: Ortwin Glück <odi@....ch> Cc: linux-kernel@...r.kernel.org Subject: Re: contention on long-held spinlock Ortwin Glück <odi@....ch> writes: > > I wonder if spinlocks could be made aware of such a situation and > relax. Something like if spinning for more than 1000 times, perform a > simple backoff and sleep. A spinlock should never spin busy for > several seconds, right? Spining for several seconds is always a bug. There's no way to make this work. Please post backtraces (e.g. from perf record -g ; perf report) and cc the driver maintainer, so that they can fix their buggy code. -Andi -- ak@...ux.intel.com -- Speaking for myself only -- 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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