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Date: Mon, 29 Jan 2007 17:31:20 -0800 From: "Martin J. Bligh" <mbligh@...igh.org> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Ingo Molnar <mingo@...e.hu> Subject: Re: [PATCH] mm: remove global locks from mm/highmem.c Peter Zijlstra wrote: > On Sun, 2007-01-28 at 14:29 -0800, Andrew Morton wrote: > >> As Christoph says, it's very much preferred that code be migrated over to >> kmap_atomic(). Partly because kmap() is deadlockable in situations where a >> large number of threads are trying to take two kmaps at the same time and >> we run out. This happened in the past, but incidences have gone away, >> probably because of kmap->kmap_atomic conversions. > >> From which callsite have you measured problems? > > CONFIG_HIGHPTE code in -rt was horrid. I'll do some measurements on > mainline. > CONFIG_HIGHPTE is always horrid -we've known that for years. Don't use it. If that's all we're fixing here, I'd be highly suspect ... M. - 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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