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| author | Lu Baolu <[email protected]> | 2021-06-10 10:01:06 +0800 |
|---|---|---|
| committer | Joerg Roedel <[email protected]> | 2021-06-10 09:06:13 +0200 |
| commit | 456bb0b97f00fe8defba155c0a4c48d951635395 (patch) | |
| tree | d39fcf67b8dca36f8316fea42e611a7d90fddf94 /lib/mpi/mpi-sub-ui.c | |
| parent | 55ee5e67a59a1b6f388d7a1c7b24022145f47a3e (diff) | |
iommu/vt-d: Expose latency monitor data through debugfs
A debugfs interface /sys/kernel/debug/iommu/intel/dmar_perf_latency is
created to control and show counts of execution time ranges for various
types per DMAR. The interface may help debug any potential performance
issue.
By default, the interface is disabled.
Possible write value of /sys/kernel/debug/iommu/intel/dmar_perf_latency
0 - disable sampling all latency data
1 - enable sampling IOTLB invalidation latency data
2 - enable sampling devTLB invalidation latency data
3 - enable sampling intr entry cache invalidation latency data
4 - enable sampling prq handling latency data
Read /sys/kernel/debug/iommu/intel/dmar_perf_latency gives a snapshot
of sampling result of all enabled monitors.
Signed-off-by: Fenghua Yu <[email protected]>
Signed-off-by: Lu Baolu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-sub-ui.c')
0 files changed, 0 insertions, 0 deletions