Messages in this thread | | | Date | Mon, 29 Jan 2007 17:49:14 -0800 | From | "Martin J. Bligh" <> | Subject | Re: [PATCH] mm: remove global locks from mm/highmem.c |
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Andrew Morton wrote: > On Mon, 29 Jan 2007 17:31:20 -0800 > "Martin J. Bligh" <mbligh@mbligh.org> wrote: > >> 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. > > We have? What's wrong with it? <looks around for bug reports>
http://www.ussg.iu.edu/hypermail/linux/kernel/0307.0/0463.html
July 2003.
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