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PERF_5.9-KMEM(1) perf Manual PERF_5.9-KMEM(1)


perf-kmem - Tool to trace/measure kernel memory properties


perf kmem {record|stat} [<options>]


There are two variants of perf kmem:

'perf kmem record <command>' to record the kmem events
of an arbitrary workload.

'perf kmem stat' to report kernel memory statistics.


-i <file>, --input=<file>

Select the input file (default: unless stdin is a fifo)

-f, --force

Don’t do ownership validation

-v, --verbose

Be more verbose. (show symbol address, etc)


Show per-callsite statistics


Show per-allocation statistics

-s <key[,key2...]>, --sort=<key[,key2...]>

Sort the output (default: frag,hit,bytes for slab and bytes,hit for page). Available sort keys are ptr, callsite, bytes, hit, pingpong, frag for slab and page, callsite, bytes, hit, order, migtype, gfp for page. This option should be preceded by one of the mode selection options - i.e. --slab, --page, --alloc and/or --caller.

-l <num>, --line=<num>

Print n lines only


Print raw ip instead of symbol


Analyze SLAB allocator events.


Analyze page allocator events


Show live page stat. The perf kmem shows total allocation stat by default, but this option shows live (currently allocated) pages instead. (This option works with --page option only)


Only analyze samples within given time window: <start>,<stop>. Times have the format seconds.microseconds. If start is not given (i.e., time string is ,x.y) then analysis starts at the beginning of the file. If stop time is not given (i.e, time string is x.y,) then analysis goes to end of file.



2020-10-05 perf