On Mon, Mar 21, 2016 at 6:37 PM, Vishwas Srivastava <[email protected]> wrote:
> Hi All, > i was trying to understand the the meaning of the PR field in > the "top" command. > > PR field is the kernel notion of importance of a task. > It is loosely coupled with the "nice" value, which is a user-space concept. > Roughly they are related with.. > > PR=20+nice (-20<= nice <=19) > which means, PR can never go below 0. > > As an experiment to understand this even more, i created an user-app with > real-time scheduling policy (SCHED_FIFO) and ran this application. > > while the application was running i triggerred "top" and what i see that > the PR value for my application displays a -ve value. > what does this mean. > If at all this is correct, what are the valid range of PR which i should > expect? > > Quick answer: have you check and read sched_setscheduler() in detail, especially part that explains about SCHED_FIFO? -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com
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