Messages in this thread | | | Date | Wed, 18 Dec 2002 08:17:17 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: Intel P6 vs P7 system call performance |
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On Tue, 17 Dec 2002, Linus Torvalds wrote:
> > On Tue, 17 Dec 2002, Linus Torvalds wrote: > > > > How about this diff? It does both the 6-parameter thing _and_ the > > AT_SYSINFO addition. > > The 6-parameter thing is broken. It's clever, but playing games with %ebp > is not going to work with restarting of the system call - we need to > restart with the proper %ebp. > > I pushed out the AT_SYSINFO stuff, but we're back to the "needs to use > 'int $0x80' for system calls that take 6 arguments" drawing board. > > The only sane way I see to fix the %ebp problem is to actually expand the > kernel "struct ptregs" to have separate "ebp" and "arg6" fields (so that > we can re-start with the right ebp, and have arg6 as the right argument on > the stack). That would work but is not really worth it. > > Linus >
How about for the new interface, a one-parameter arg, i.e., a pointer to a descriptor (structure)?? For the typical one-argument call, i.e., getpid(), it's just one de-reference. The pointer register can be EAX on Intel, a register normally available in a 'C' call.
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.
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