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Message-ID: <20060906084021.GA30856@elte.hu> Date: Wed, 6 Sep 2006 10:40:21 +0200 From: Ingo Molnar <mingo@...e.hu> To: Hua Zhong <hzhong@...il.com> Cc: 'Heiko Carstens' <heiko.carstens@...ibm.com>, 'Andrew Morton' <akpm@...l.org>, linux-kernel@...r.kernel.org, 'Arjan van de Ven' <arjan@...radead.org>, 'Daniel Walker' <dwalker@...sta.com> Subject: Re: lockdep oddity * Hua Zhong <hzhong@...il.com> wrote: > We are just trading accuracy for speed here. no, we are trading _both_ accuracy and speed here! a global 'likeliness' pointer for commonly executed codepaths is causing global cacheline ping-pongs - which is as bad as it gets. the right approach, which incidentally would also be perfectly accurate, is to store an alloc_percpu()-ed pointer at the call site, not the counter itself. the current code needs more work before it can go upstream i think. Ingo - 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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