Re: [Xen-ia64-devel] Add ptc.l emulation for 2.6.17 xenlinux to fix federon-xen-ia64 boot

[Alex Williamson <alex.williamson@xxxxxx>]

On Wed, 2006-05-24 at 19:25 +0800, Zhang, Xiantao wrote:
> This patch adds support for ptc.l emulation. In 2.6.16 kernel
> flush_tlb_range will call global_tlb_purge directly, so ptc.l shouldn't
> be used when CONFIG_SMP enable.
> But in order to enhance performance (maybe), 2.6.17 kernel in smp
> environment
> will do mm check first. If mm is current->active_mm and the mm
> (corresponding process) just runs on the local processor, kernel only
> needs to do ptc.l at local processor instead of global purge. So ptc.l
> emulation is necessary for 2.6.17 kernel.

   Applied.

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab


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