Re: stable commit notes

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On Wed, Aug 24, 2016 at 02:34:07AM -0400, Willy Tarreau wrote:
> Hi Sasha,
> 
> On Tue, Aug 23, 2016 at 01:54:40PM -0400, Levin, Alexander wrote:
> > I've decided to automate the bits I had for tracking stable mailing list
> > discussion and wrap it into the git notes interface to make it easy for
> > stable maintainers to track discussions related to stable commits.
> 
> I actually think it's a good idea. I already use notes locally when I
> know I have to take care of certain commits, or when I want to mark that
> I already tested them. I don't know how practical this will be over the
> long term but it can definitely help.

What's the concern about long term? My view is that if this will encourage reviews in the long term.
 
> > Dave has a very valid point: we don't actually investigate the history and
> > correctness for patches that look sane as much as we should. The volume of
> > commits is so big that we might miss comments given by reviewers that we
> > should consider as well.
> 
> In fact I think that in the ideal case we would propagate fixes from most
> recent versions to oldest ones. This normally completely avoids all such
> issues. But the reality is different as the older kernels we're maintaining
> don't have the same release cycles so it's hard to expect that your 4.1
> fetches from 4.4, then feeds your 3.18 which then feeds Ben's 3.16, then
> Greg's 3.14, then Jiri's 3.12, then my 3.10 etc... So the reality is that
> we're re-doing some part of the work on our respective sides and checking
> in other branches if we find anything relevant. Thus I pick from 3.14, and
> check for the equivalent 3.12 patches in my mbox to see if I notice any
> particular comment regarding the backport. That obviously doesn't mean it's
> riskless, just that the risk is reasonably low. At worst I'll pick a bug
> and its fix like I did this time without noticing it.

Ideally, if the process is automated enough it could work this way. It also means that we'll need just 1 maintainer rather than 5 :)

> My scripts do look for the Fixes tag, indicate whether the patch in question
> is in my branch or not, and carry the mainline commit ID so that it's easy
> to look for a "Fixes:" in mainline referencing it and grep for it in other
> branches. Thus I think that it should integrate nicely with your notes
> since I could easily check for each individual patch if there are some
> particular notes and for example refuse to merge it to force to read the
> notes.
> 
> (...)
> > To verify it works, try looking at the original commit that Dave's rant was
> > all about and make sure you see the mailing list correspondence:
> > 
> > 	git log b1438f477934f5a4d5a44df26f3079a7575d5946
> > 
> > Updating is just a matter of fetching again. I'll make sure to push updates
> > on a daily basis.
> 
> I'll definitely give it a try ASAP. If you can add a link to the
> discussion thread based on the message ID, it would be really cool!

I can look into that. Right now I get the mails from my offlinemap dir, so I'll need to figure out how to do that.

-- 

Thanks,
Sasha
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