Re: verify predefined LWLocks have entries in wait_event_names.txt

On Fri, Jan 05, 2024 at 10:42:03AM -0600, Nathan Bossart wrote:
> On Fri, Jan 05, 2024 at 07:39:39AM +0000, Bertrand Drouvot wrote:
>> +       die "lists of predefined LWLocks in lwlocknames.txt and wait_event_names.txt do not match"
>> +         unless $wait_event_lwlocks[$i] eq $lockname;
>> 
>> What about printing $wait_event_lwlocks[$i] and $lockname in the error message?
>> Something like?
>> 
>> "
>>     die "lists of predefined LWLocks in lwlocknames.txt and wait_event_names.txt do not match (comparing $lockname and $wait_event_lwlocks[$i])"
>>       unless $wait_event_lwlocks[$i] eq $lockname;
>> "
>> 
>> I think that would give more clues for debugging purpose.
> 
> Sure, I'll add something like that.  I think this particular scenario is
> less likely, but that's not a reason to make the error message hard to
> decipher.

Here is a new version of the patch with this change.

I also tried to make the verification logic less fragile.  Instead of
depending on the exact location of empty lines in wait_event_names.txt, v3
adds a marker comment below the list that clearly indicates it should not
be changed.  This simplifies the verification code a bit, too.

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com