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| author | Shrikanth Hegde <sshegde@linux.ibm.com> | 2026-09-21 14:31:53 +0530 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2026-09-25 10:16:10 +0530 |
| commit | 2d97c8498a9fca1a876b7a8b4fda024f8e234361 (patch) | |
| tree | b2a8e31366b8fd1c2b08316daec89b0a3b5e1cf1 /tools/perf/scripts/python | |
| parent | fbb22ceaaf8f9c6786e6ff5da1962fe6ac0fc904 (diff) | |
powerpc/irq: Suppress unlikely interrupt stats by default
Some interrupts are always zero and that is expected since they occur
very rarely and are mostly error indications. Don't print them by
default.
"MCE" - "Machine check exceptions"
"NMI" - "System Reset interrupts"
Print them if they occur once. Maintain a bitmap to know which
interrupts are to be printed.
Time taken to read /proc/interrupts 1000 times.
Base and v6 details can be found in cover-letter.
Base : 103us
v6 : 63us
v6+patch 1+2 : 57us
v6+patch 1+2+3 : 54us
Patch 3 shows an additional 5% gain compared to patch 1+2. So it does
make sense to print them only if they are ever set.
Note: Since /proc/interrupts depend on kconfig and arch dependent,
userspace tools don't make explicit assumptions.
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260921090153.54745-4-sshegde@linux.ibm.com
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions