PERF-KMEM(1)                      perf Manual                     PERF-KMEM(1)

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

SYNOPSIS
       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
       perf-record(1)

perf                              2021-10-08                      PERF-KMEM(1)