From mboxrd@z Thu Jan 1 00:00:00 1970 From: mulyadi.santosa@gmail.com (Mulyadi Santosa) Date: Tue, 22 Mar 2016 12:28:06 +0700 Subject: PR Value in the top command In-Reply-To: References: Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org On Mon, Mar 21, 2016 at 6:37 PM, Vishwas Srivastava 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20160322/ecd6e5ae/attachment.html