linux-kernel - Re: Linux 2.6.21

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Message-ID: <4630E9C8.5060000@garzik.org>
Date:	Thu, 26 Apr 2007 14:04:56 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Adrian Bunk <bunk@...sta.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.21

IMO, the closer you look, the more warts you find.  Before you starting 
doing your work with kernel regressions, no one was really tracking it. 
  I bet you have helped cut down on the regressions, but I have no good 
way to quantify my gut feeling.

Additional comments on developers and fixing regressions:

* Sometimes seeing a long list, peoples' eyes glaze over.  Its just 
human nature.  A long list also gives us no idea of scale, or severity. 
  I bet a weekly "top 10 bugs and regressions" email would help focus 
developer attention.

* To be effective, lists, either long or top-10, must be pruned if you 
get a sense that only one user is affected.  [With oopses and BUGs as a 
clear exception,] many problems benefit from at least two users 
reporting a bug.

* It gets a bit tiresome to field the large number of driver bug reports 
that eventually turn out to be related to broken interrupt handling 
somehow.  I think we developers need to get better at showing users how 
to isolate driver vs. PCI/ACPI/core bugs.  Maybe drivers need to start 
introducing interrupt delivery tests into their probe code.  Overall, 
broken interrupt handling manifests in several ways, most of which 
initially appear symptomatic of a broken driver.

	Jeff

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