_PAGE_GLOBAL for ioremap()'ed and vmalloc()'ed memory

Manfred Spraul (manfreds@colorfullife.com)
Fri, 24 Sep 1999 15:45:23 +0000

neither ioremap() nor vmalloc() currently set _PAGE_GLOBAL. I think it
would be a good idea to set this flag for these pages.

I tried to write a patch, but then I ran into a problem:
On UP, the kernel calls flush_tlb_all() if kernel pages have changed, I
could add a WBINVD instruction to flush_tlb_all(). flush_tlb_all() is
rare, the WBINVD would not be a performance problem.

But on SMP, there is no "flush_tlb_all()"-IPI, ie I must add a new IPI
[with smp_call_function()].

Do you think that
1) it's not worth the effort.
2) the patch would be a victim of the feature freeze, wait for 2.5
3) write the patch and wait until Linus returns.

--
	Manfred


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