perf/amd/ibs: Account interrupt for discarded samples

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Add interrupt throttling accounting for below cases:

  o IBS Op PMU: A software filter (in addition to the hardware filter)
    drops samples whose load latency is below the user-specified
    threshold.

  o IBS Fetch PMU: Samples discarded due to the zero-RIP erratum (#1197).

Although these samples are discarded, the NMI cost is still incurred, so
they should be counted for interrupt throttling.

Fixes: 26db2e0c51 ("perf/x86/amd/ibs: Work around erratum #1197")
Fixes: d20610c19b ("perf/amd/ibs: Add support for OP Load Latency Filtering")
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: https://patch.msgid.link/20260216042216.1440-2-ravi.bangoria@amd.com

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Ravi Bangoria 2026-02-16 04:22:12 +00:00 • committed by Peter Zijlstra

parent da45c8d5f0

commit 01336b5559

1 changed files with 6 additions and 2 deletions

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arch/x86/events/amd/ibs.c

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