Messages in this thread | | | Date | Fri, 12 Dec 2014 08:40:29 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [GIT pull] x86 mpx support for 3.19 |
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On 12/10/2014 12:49 PM, Linus Torvalds wrote: > On Wed, Dec 10, 2014 at 12:39 PM, Dave Hansen > <dave.hansen@linux.intel.com> wrote: >> >> I misspoke there. I meant SMAP (I placed MPX below its config option). > > Ok, I agree on SMAP, we might want to have that be configurable too, > especially for smaller systems (I *think* SMAP is big-core only, > right?). I'm not sure how much of a possible performance downside it > has, but it does add instructions to potentially critical areas. >
*As far as I know*, SMAP will be pushed into all CPUs over time.
SMAP is already configurable, although the overhead on non-SMAP-enabled hardware is minimal (the CLAC/STAC instructions get patched out.)
-hpa
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