linux-kernel - Re: Slow DOWN, please!!!

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Message-ID: <11481.1209670599@turing-police.cc.vt.edu>
Date:	Thu, 01 May 2008 15:36:39 -0400
From:	Valdis.Kletnieks@...edu
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Willy Tarreau <w@....eu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: Slow DOWN, please!!!

On Thu, 01 May 2008 13:53:18 +0200, "Rafael J. Wysocki" said:

> How about:
> 
> (1) Merge a couple of trees at a time (one tree at a time would be ideal, but
>     that's impossible due to the total number of trees).
> (2) After (1) give testers some time to report problems introduced by the
>     merge.
> (3) Wait until the most urgent problems are resolved.  Revert the offending
>     changes if there's no solution within given time.
> (4) Repeat for another couple of trees.
> (5) Arrange things so that every tree gets merged once every two months.

You can't get there from here (at least not very easily).

If you have 60 trees, and want a merge for each one every 2 months, you have to
average 1 tree a day.  How big a delay you want in step (2) directly impacts
how many trees you merge at once - if you want a week of cook time, you have to
merge 7 trees every Monday, and so on...


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