Debug cache miss

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Hi everyone,

Recently I'm getting complete I/O freezes (mouse still working).
I think, it's a cache miss.
Sometimes I see on dmesg this error:
kernel: perf: interrupt took too long (2575 > 2500), lowering
kernel.perf_event_max_sample_rate to 77400
(Numbers change)

How can I debug this? Where should I look?
Currently I'm watching cache_bypass_misses

Thanks,

Shay
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