Messages in this thread | | | Date | Mon, 29 Jan 2007 20:53:07 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] mm: remove global locks from mm/highmem.c |
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* Hugh Dickins <hugh@veritas.com> wrote:
> > For every 64-bit Fedora box there's more than seven 32-bit boxes. I > > think 32-bit is going to live with us far longer than many thought, > > so we might as well make it work better. Both HIGHMEM and HIGHPTE is > > the default on many distro kernels, which pushes the kmap > > infrastructure quite a bit. > > But HIGHPTE uses kmap_atomic (in mainline: does -rt use kmap there?)
The contention i saw was on mainline and in the pagecache uses of kmap(). With HIGHPTE i only meant that typically every available highmem option is enabled on 32-bit distro kernel rpms, to make it work on as wide selection of hardware as possible. Sometimes PAE is split into a separate rpm, but mostly there's just one 32-bit kernel.
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