[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Sat, 9 Feb 2019 11:38:00 +0000
From: "Reshetova, Elena" <elena.reshetova@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
CC: "kernel-hardening@...ts.openwall.com"
<kernel-hardening@...ts.openwall.com>, "luto@...nel.org" <luto@...nel.org>,
"tglx@...utronix.de" <tglx@...utronix.de>, "mingo@...hat.com"
<mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>, "keescook@...omium.org"
<keescook@...omium.org>, "tytso@....edu" <tytso@....edu>
Subject: RE: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon
system call
On Fri, Feb 08, 2019 at 01:20:09PM +0000, Reshetova, Elena wrote:
> > > On Fri, Feb 08, 2019 at 02:15:49PM +0200, Elena Reshetova wrote:
>
> > I can measure the impact with rdtsc(), I think it is *very* small.
> > Btw, what should be the good measurement test?
> > I am not that happy with just looping on fopen-fclose, too
> > much noise.
>
> IIRC amluto had a nice micro-bench for 'pure' syscall overhead
> somewhere.
>
> Something like getpid/gettid in a loop should work fairly well, that's a
> really light syscall to make.
Thanks! Let me try this for measurements next. I was surprise that
there nothing ready-made in perf or rt-tools. You would think
this must be regularly in a need to measure.
Best Regards,
Elena.
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
