From: Christoph Lameter <[email protected]>
Date: Thu, 1 Nov 2007 15:15:39 -0700 (PDT)
> After boot is complete we allow the reduction of the size of the per cpu
> areas . Lets say we only need 128k per cpu. Then the remaining pages will
> be returned to the page allocator.
You don't know how much you will need. I exhausted the limit on
sparc64 very late in the boot process when the last few userland
services were starting up.
And if I subsequently bring up 100,000 IP tunnels, it will exhaust the
per-cpu allocation area.
You have to make it fully dynamic, there is no way around it.
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