Followup to: <[EMAIL PROTECTED]>
By author: Richard Gooch <[EMAIL PROTECTED]>
In newsgroup: linux.dev.kernel
> >
> > In x86-64 there are special vsyscalls btw to solve this problem that export
> > a lockless kernel gettimeofday()
>
> Whatever happened to that hack that was discussed a year or two ago?
> The one where (also on IA32) a magic page was set up by the kernel
> containing code for fast system calls, and the kernel would write
> calibation information to that magic page. The code written there
> would use the TSC in conjunction with that calibration data.
>
> There was much discussion about this idea, even Linus was keen on
> it. But IIRC, nothing ever happened.
>
We discussed this at the Summit, not a year or two ago. x86-64 has
it, and it wouldn't be too bad to do in i386... just noone did.
-hpa
--
<[EMAIL PROTECTED]> at work, <[EMAIL PROTECTED]> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
-
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/
