* Nick Piggin <[email protected]> wrote:
> >>Just a minor point, I agree with David: I'd like it to be called
> >>prefetch_task(), because some architecture may want to prefetch other
> >>memory.
> >
> >such as?
>
> Not sure. thread_info? Maybe next->timestamp or some other fields in
> next, something in next->mm?
next->thread_info we could and should prefetch - but from the generic
scheduler code (see the patch i just sent).
i'm not sure what you mean by prefetching next->timestamp, it's an
inline field to 'next', in the first cacheline of it, which we've
already used so it's present. (If you mean the value of next->timestamp,
that has no address meaning at all so would lead to unpredictable
results on some arches.)
next->mm we might want to prefetch, but it's probably not worth it
because we are referencing it too soon, in context_switch(). (while the
kernel stack itself wont be referenced until the full context-switch is
done) But might be worth trying - but even then, it should be done from
the generic code, like the thread_info and kernel-stack prefetching.
> I didn't really have a concrete example, but in the interests of being
> future proof...
i'd like to keep generic bits in generic code, and only move things to
per-arch include files if absolutely necessary. next->mm is generic.
Ingo
-
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]
| |
 |