On Thu, Jul 14, 2016 at 6:42 AM, Arjan van de Ven <ar...@linux.intel.com> wrote: > On 7/14/2016 5:48 AM, Serge E. Hallyn wrote: > >> Can someone give a detailed explanation of what you could do with >> the new timerslack feature and compare it to what you can do with >> sys_nice? >> > > what you can do with the timerslack feature is add upto 4 seconds of extra > time/delay on top of each select()/poll()/nanosleep()/... (basically > anything that > uses hrtimers on behalf of the user), and then also control within that > 4 second window exactly when that extra delay ends > (which may help a timing attack kind of scenario)
So the interface actually allows for 64bits of nanoseconds, so more or less infinite delay if nothing else is happening. thanks -john
