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The SSD controller triggers the garbage collection routines on a specific ship or block when a certain threshold of either invalid pages or written pages is met, based on the GC policy (my guess is that most SSDs use the greedy policy).
I am trying to measure the impact of some workloads on a specific SSD, I've already done the performance measurements using FIO, but i would like to go even further.
Is there a way to get notified when the Garbage Collector routine on a SSD is triggered?
No, what you are asking is basically the "secret sauce" of your SSD controller firmware. SSD vendors treat the internal controller routines, and their implementation, as a trade secret.
You can only guess at what is happening by triggering a specific load and carefully examine the results.
