1PERF-KMEM(1) perf Manual PERF-KMEM(1)
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6 perf-kmem - Tool to trace/measure kernel memory properties
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9 perf kmem {record|stat} [<options>]
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12 There are two variants of perf kmem:
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14 'perf kmem record <command>' to record the kmem events
15 of an arbitrary workload.
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17 'perf kmem stat' to report kernel memory statistics.
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20 -i <file>, --input=<file>
21 Select the input file (default: perf.data unless stdin is a fifo)
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23 -v, --verbose
24 Be more verbose. (show symbol address, etc)
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26 --caller
27 Show per-callsite statistics
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29 --alloc
30 Show per-allocation statistics
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32 -s <key[,key2...]>, --sort=<key[,key2...]>
33 Sort the output (default: frag,hit,bytes for slab and bytes,hit for
34 page). Available sort keys are ptr, callsite, bytes, hit, pingpong,
35 frag for slab and page, callsite, bytes, hit, order, migtype, gfp
36 for page. This option should be preceded by one of the mode
37 selection options - i.e. --slab, --page, --alloc and/or --caller.
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39 -l <num>, --line=<num>
40 Print n lines only
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42 --raw-ip
43 Print raw ip instead of symbol
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45 --slab
46 Analyze SLAB allocator events.
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48 --page
49 Analyze page allocator events
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51 --live
52 Show live page stat. The perf kmem shows total allocation stat by
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54 instead. (This option works with --page option only)
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56 --time
57 Only analyze samples within given time window: <start>,<stop>.
58 Times have the format seconds.microseconds. If start is not given
59 (i.e., time string is ,x.y) then analysis starts at the beginning
60 of the file. If stop time is not given (i.e, time string is x.y,)
61 then analysis goes to end of file.
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64 perf-record(1)
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68perf 06/18/2019 PERF-KMEM(1)