Messages in this thread | | | Subject | Re: [PATCH V2 1/2] mm: move FAULT_AROUND_ORDER to arch/ | From | Benjamin Herrenschmidt <> | Date | Mon, 07 Apr 2014 15:45:34 +1000 |
| |
On Fri, 2014-04-04 at 09:18 -0700, Dave Hansen wrote: > On 04/03/2014 11:27 PM, Madhavan Srinivasan wrote: > > This patch creates infrastructure to move the FAULT_AROUND_ORDER > > to arch/ using Kconfig. This will enable architecture maintainers > > to decide on suitable FAULT_AROUND_ORDER value based on > > performance data for that architecture. Patch also adds > > FAULT_AROUND_ORDER Kconfig element in arch/X86. > > Please don't do it this way. > > In mm/Kconfig, put > > config FAULT_AROUND_ORDER > int > default 1234 if POWERPC > default 4 > > The way you have it now, every single architecture that needs to enable > this has to go put that in their Kconfig. That's madness. This way, > you only put it in one place, and folks only have to care if they want > to change the default to be something other than 4.
Also does it have to be a constant ? Maddy here tested on our POWER servers. The "Sweet spot" value might be VERY different on an embedded chip or even on a future generation of server chip.
Cheers, Ben.
| |