1perf-kmem(1) 2============ 3 4NAME 5---- 6perf-kmem - Tool to trace/measure kernel memory properties 7 8SYNOPSIS 9-------- 10[verse] 11'perf kmem' [<options>] {record|stat} 12 13DESCRIPTION 14----------- 15There are two variants of perf kmem: 16 17 'perf kmem [<options>] record [<perf-record-options>] <command>' to 18 record the kmem events of an arbitrary workload. Additional 'perf 19 record' options may be specified after record, such as '-o' to 20 change the output file name. 21 22 'perf kmem [<options>] stat' to report kernel memory statistics. 23 24OPTIONS 25------- 26-i <file>:: 27--input=<file>:: 28 For stat, select the input file (default: perf.data unless stdin is a 29 fifo) 30 31-f:: 32--force:: 33 Don't do ownership validation 34 35-v:: 36--verbose:: 37 Be more verbose. (show symbol address, etc) 38 39--caller:: 40 Show per-callsite statistics 41 42--alloc:: 43 Show per-allocation statistics 44 45-s <key[,key2...]>:: 46--sort=<key[,key2...]>:: 47 Sort the output (default: 'frag,hit,bytes' for slab and 'bytes,hit' 48 for page). Available sort keys are 'ptr, callsite, bytes, hit, 49 pingpong, frag' for slab and 'page, callsite, bytes, hit, order, 50 migtype, gfp' for page. This option should be preceded by one of the 51 mode selection options - i.e. --slab, --page, --alloc and/or --caller. 52 53-l <num>:: 54--line=<num>:: 55 Print n lines only 56 57--raw-ip:: 58 Print raw ip instead of symbol 59 60--slab:: 61 Analyze SLAB allocator events. 62 63--page:: 64 Analyze page allocator events 65 66--live:: 67 Show live page stat. The perf kmem shows total allocation stat by 68 default, but this option shows live (currently allocated) pages 69 instead. (This option works with --page option only) 70 71--time=<start>,<stop>:: 72 Only analyze samples within given time window: <start>,<stop>. Times 73 have the format seconds.microseconds. If start is not given (i.e., time 74 string is ',x.y') then analysis starts at the beginning of the file. If 75 stop time is not given (i.e, time string is 'x.y,') then analysis goes 76 to end of file. 77 78SEE ALSO 79-------- 80linkperf:perf-record[1] 81