[Ksummit-2012-discuss] [ATTEND] stable kernel stuff and grumpy maintainers

Dave Jones davej at redhat.com
Wed Jun 20 15:14:33 UTC 2012

On Wed, Jun 20, 2012 at 09:37:01AM +0100, Mel Gorman wrote:

 > Many of the patches I backport are performance related. Some are throughput
 > or latency style fixes and others are interactivity related particularly
 > when IO is involved. These are not "critical". In some cases there are
 > multiple patches required and that falls foul of the "It must fix only
 > one thing." rule.
 > Hence, if I discover something really bad and fix it in mainline then I tag
 > it for -stable. However, I was not reposting patches for -stable that fixed
 > more subtle issues because they were not critical, just desirable. 

As you mention these are not critical, and mm/vfs/block seem to be historically
fragile areas that are easy to introduce regressions into.

We never get Fedora bugs like "mmap got 5% slower". We get "I get this weird oops sometimes".
Fedora users are a different breed to say RHEL/SLES/LTS users, but that's a separate
problem that needs solving not through stable.

The only exception I'd give is if the performance difference was huge, and
impacted a lot of users.

Also, given the number of patches that goes into the first few stable releases
once Linus opens up for merges, I suspect changing this rule would make the
patch-bombs even more unreviewable.


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