Messages in this thread | | | Date | Fri, 24 Sep 1999 15:45:23 +0000 | From | Manfred Spraul <> | Subject | _PAGE_GLOBAL for ioremap()'ed and vmalloc()'ed memory |
| |
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
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |