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621:. When CFS was first merged to mainline, it was actually slower than the O(1) scheduler even at low loads. However, compared to everything else that needs doing, scheduler overhead is usually insignificant. CFS has also been optimized since then, so it's possible that it's faster than the old scheduler now. But I don't know of any precise measurements of this. --
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Sorry for the terrible commit message, accidentally pressed enter while still typing it. Meant to say: CFS was not inspired by BFS, nor could it have been -- BFS was begun over 2 years after CFS (August 2009 vs April 2007). As Molnár's email says, it was inspired by
Kolivas's Staircase Deadline
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669:(cur | prev) 08:33, 10 May 2015‎ 96.57.23.82 (talk)‎ . . (10,386 bytes) (-1,771)‎ . . (The section serves no purpose to understanding CFS. Maybe it should be in someones bio pages.) (undo) (Tag: section blanking)
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I would dare to say that CFS has "relevance" because of the controversy between the Linux developers, a discussion that Linus
Torvalds seems to have lost (see
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The controversy section is actually very useful to understand why this article is relevant anyway. I see that it was removed by this change:
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I guess the O(log n) CFS was introduced to the Linux kernel for performance improvements compared to the older O(1) scheduler, the
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Actually the main reason for the new scheduler was not "performance" (e.g. scheduler overhead), but
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