Re: [PATCH 3/3] locking/csd-lock: Use backoff for repeated reports of same incident

[Rik van Riel]

On Sat, 2024-07-13 at 22:28 +0530, neeraj.upadhyay@xxxxxxxxxx wrote:
> From: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
> 
> Currently, the CSD-lock diagnostics in CONFIG_CSD_LOCK_WAIT_DEBUG=y
> kernels are emitted at five-second intervals.  Although this has
> proven
> to be a good time interval for the first diagnostic, if the target
> CPU
> keeps interrupts disabled for way longer than five seconds, the ratio
> of useful new information to pointless repetition increases
> considerably.
> 
> Therefore, back off the time period for repeated reports of the same
> incident, increasing linearly with the number of reports and
> logarithmicly
> with the number of online CPUs.
> 
> [ paulmck: Apply Dan Carpenter feedback. ]
> 
> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
> Cc: Imran Khan <imran.f.khan@xxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Leonardo Bras <leobras@xxxxxxxxxx>
> Cc: "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxxx>
> Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@xxxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxxx>

-- 
All Rights Reversed.