Russell King <[EMAIL PROTECTED]> wrote: > On Mon, Aug 01, 2005 at 01:24:04PM +0100, Catalin Marinas wrote: >> "David S. Miller" <[EMAIL PROTECTED]> wrote: >> > If one cpu stores, does it get picked up in the other cpu's I-cache? >> >> It only gets picked up by the other CPU's D-cache (which is fully >> coherent between cores). The I-cache needs to be invalidated on each >> CPU. > > Are you sure about this requirement? I see no evidence of it in Harry's > patch set.
I asked the people that know more about this architecture than me and they confirmed that this is a requirement. I will double check tomorrow with the people that did the initial Linux support. I haven't checked the original patch but it might work (by luck) without the I-cache invalidation (and without stressing it too much). This is because you might do a full mm flush when a process exits and the I-cache would be clean for newly allocated pages (only the D-cache needs flushing). If you don't overload memory, you don't get pages swapped-out/removed and the code in a page for a given process might remain unchanged until the process exits. -- Catalin - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
