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- perf-kmem(1)
- ============
- NAME
- ----
- perf-kmem - Tool to trace/measure kernel memory properties
- SYNOPSIS
- --------
- [verse]
- 'perf kmem' [<options>] {record|stat}
- DESCRIPTION
- -----------
- There are two variants of perf kmem:
- 'perf kmem [<options>] record [<perf-record-options>] <command>' to
- record the kmem events of an arbitrary workload. Additional 'perf
- record' options may be specified after record, such as '-o' to
- change the output file name.
- 'perf kmem [<options>] stat' to report kernel memory statistics.
- OPTIONS
- -------
- -i <file>::
- --input=<file>::
- For stat, select the input file (default: perf.data unless stdin is a
- fifo)
- -f::
- --force::
- Don't do ownership validation
- -v::
- --verbose::
- Be more verbose. (show symbol address, etc)
- --caller::
- Show per-callsite statistics
- --alloc::
- 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
- --raw-ip::
- Print raw ip instead of symbol
- --slab::
- Analyze SLAB allocator events.
- --page::
- Analyze page allocator events
- --live::
- 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)
- --time=<start>,<stop>::
- 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.
- SEE ALSO
- --------
- linkperf:perf-record[1]
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