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1perf-kmem(1)2============3 4NAME5----6perf-kmem - Tool to trace/measure kernel memory properties7 8SYNOPSIS9--------10[verse]11'perf kmem' [<options>] {record|stat}12 13DESCRIPTION14-----------15There are two variants of perf kmem:16 17 'perf kmem [<options>] record [<perf-record-options>] <command>' to18 record the kmem events of an arbitrary workload. Additional 'perf19 record' options may be specified after record, such as '-o' to20 change the output file name.21 22 'perf kmem [<options>] stat' to report kernel memory statistics.23 24OPTIONS25-------26-i <file>::27--input=<file>::28 For stat, select the input file (default: perf.data unless stdin is a29 fifo)30 31-f::32--force::33 Don't do ownership validation34 35-v::36--verbose::37 Be more verbose. (show symbol address, etc)38 39--caller::40 Show per-callsite statistics41 42--alloc::43 Show per-allocation statistics44 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 the51 mode selection options - i.e. --slab, --page, --alloc and/or --caller.52 53-l <num>::54--line=<num>::55 Print n lines only56 57--raw-ip::58 Print raw ip instead of symbol59 60--slab::61 Analyze SLAB allocator events.62 63--page::64 Analyze page allocator events65 66--live::67 Show live page stat. The perf kmem shows total allocation stat by68 default, but this option shows live (currently allocated) pages69 instead. (This option works with --page option only)70 71--time=<start>,<stop>::72 Only analyze samples within given time window: <start>,<stop>. Times73 have the format seconds.microseconds. If start is not given (i.e., time74 string is ',x.y') then analysis starts at the beginning of the file. If75 stop time is not given (i.e, time string is 'x.y,') then analysis goes76 to end of file.77 78SEE ALSO79--------80linkperf:perf-record[1]81