lkml.org 
[lkml]   [2008]   [Apr]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/11] x86: convert to generic helpers for IPI function calls

* Linus Torvalds <torvalds@linux-foundation.org> wrote:

>
> [ Ingo added to cc, since this is x86-specific ]
>
> On Tue, 22 Apr 2008, Jens Axboe wrote:
> > +++ b/arch/x86/kernel/apic_32.c
> > @@ -1357,6 +1357,10 @@ void __init smp_intr_init(void)
> >
> > /* IPI for generic function call */
> > set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
> > +
> > + /* IPI for single call function */
> > + set_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
> > + call_function_single_interrupt);
>
> Ok, one more comment..
>
> Why bother with separate vectors for this?

this was my first question a month ago when Jens/Nick first submitted it
:)

> Or is it just a performance optimization? [...]

yes and i gave in - Nick and Jens wants to do some crazy stuff and they
had the numbers. Here's the previous discussion:

http://lkml.org/lkml/2008/2/27/125

Ingo


\
 
 \ /
  Last update: 2008-04-22 21:17    [from the cache]
©2003-2011 Jasper Spaans