Linux System Programming: Talking Directly to the Kernel and C Library by Love Robert
Author:Love, Robert [Love, Robert]
Language: eng
Format: azw3
Tags: COMPUTERS / Operating Systems / UNIX
ISBN: 9781449339517
Publisher: O'Reilly Media
Published: 2013-05-13T16:00:00+00:00
Note
Scheduler Activations is a solution that provides kernel support for user-level threads, enabling more performant execution of N:M threading. It began as an academic paper out of the University of Washington and was later adopted by both FreeBSD and NetBSD, becoming the core of their threading implementation. Scheduler Activations allow user-space control of and insight into the kernel’s process scheduling, which makes the hybrid model more efficient and fixes several issues that can crop up in an implementation unassisted by the kernel.
Both FreeBSD and NetBSD have abandoned Scheduler Activations in preference for simpler 1:1 threading. You can view this as both a rejection of the complexity of the N:M model and a response to the ubiquity of the x86 architecture, which allows for relatively efficient context switches.
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