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Date: Thu, 29 Oct 2009 20:38:31 +0530 From: Daniel Rodrick <daniel.rodrick@...il.com> To: Linux Newbie <linux-newbie@...r.kernel.org>, Kernel Newbies <kernelnewbies@...linux.org>, linux-kernel@...r.kernel.org Subject: Questions about linux scheduler Hi list, I'm following the Robert Love's book and am trying to understand the Linux O(1) scheduler. So here is my understanding. The kernel allows the applications to specify two types of priorities * Realtime Priorities: Range from 0 to 99 * Non-realtime priorities: Also called "nice" values range from -20 to +19. (The above are mutually exclusive) Over all Scheduling algo ================= * A total of 140 priorities (100 RT + 40 non-RT) - these priorities are static - do not change over time. * A lower priority process will run only if there are no runnable processes in priority above it - this automatically means that all RT processes get to run before non-RT processes. * tasks on the same priority level are scheduled round robin Is my above understanding correct? Where my understanding doesn't fit is the conncept of dynamic timeslice calculation. IMHO, the dynamic timeslice calculation applies only to Non-RT processes, right? Because a higher priority RT process should always get to run. Thanks, Dan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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