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/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |