Messages in this thread | | | Date | Thu, 11 Jan 2018 19:34:31 +0000 | From | Alan Cox <> | Subject | Re: [RFC PATCH v2 6/6] x86/entry/pti: don't switch PGD on when pti_disable is set |
| |
On Thu, 11 Jan 2018 13:26:01 -0600 Josh Poimboeuf <jpoimboe@redhat.com> wrote:
> On Thu, Jan 11, 2018 at 08:19:35PM +0100, Olivier Galibert wrote: > > Wouldn't the time taken by an easy syscall like getuid be a clear indicator? > > I think only if you had a baseline measurement to compare against.
getuid can also be cached by a smart libc. getppid() is what micro benchmarks seem to favour.
Alan
| |