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