KVM: s390: Add tracepoint for DIAG 9c directed yield operations

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Add a new tracepoint, kvm_s390_diag_9c, to provide visibility into
directed yield operations. The tracepoint records:

  - Source vCPU context via the standard vCPU tracepoint fields
  - Target vCPU ID
  - Target physical CPU number
  - Operation result (done, ignored, or yield forwarded)

This improves observability of vCPU scheduling behaviour and helps
diagnose performance issues related to directed yields in virtualised
s390 environments.

Signed-off-by: Ciunas Bennett <ciunas@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

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Ciunas Bennett 2026-07-24 12:39:58 +02:00 • committed by Christian Borntraeger

parent a3928021b9

commit 5ff53ce9a4

2 changed files with 27 additions and 0 deletions

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arch/s390/kvm/diag.c

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26

arch/s390/kvm/trace.h

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