samarasa samarasa - 1 year ago 127
Linux Question

Command to measure TLB misses on LINUX

Could some one direct me to a command to measure TLB misses on LINUX, please? Is it okay to consider minor page faults as TLB misses?

Answer Source

You can use perf to do this. Provided your CPU supports it.

Use perf list to get some idea of the counters available. When I took this list and grepped for TLB (on my Sandy Bridge machine) I got:

rob@tartarus:~$ perf list | grep -i tlb
  dTLB-loads                                         [Hardware cache event]
  dTLB-load-misses                                   [Hardware cache event]
  dTLB-stores                                        [Hardware cache event]
  dTLB-store-misses                                  [Hardware cache event]
  dTLB-prefetches                                    [Hardware cache event]
  dTLB-prefetch-misses                               [Hardware cache event]
  iTLB-loads                                         [Hardware cache event]
  iTLB-load-misses                                   [Hardware cache event]

You can then use this particular counter with: perf record -e <event0>,<event1>,..

And then just use perf report to look at the results.

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