Re: [PATCH 2/2] proc: Add /proc/<pid>/timerslack_ns interface

From: Arjan van de Ven
Date: Thu Jul 14 2016 - 09:42:15 EST


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)