1TRACE-CMD-MEM(1) libtracefs Manual TRACE-CMD-MEM(1)
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6 trace-cmd-mem - show memory usage of certain kmem events
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9 trace-cmd mem [OPTIONS][input-file]
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12 The trace-cmd(1) mem requires a trace-cmd record that enabled the
13 following events:
14 kmalloc
16 kmalloc_node
17 kfree
18 kmem_cache_alloc
19 kmem_cache_alloc_node
20 kmem_cache_alloc_free
21 It then reads the amount requested and the ammount freed as well as the
23 functions that called the allocation. It then reports the final amount
24 of bytes requested and allocated, along with the total amount allocated
25 and requested, as well as the max allocation and requested during the
26 run. It reports the amount of wasted bytes (allocated - requested) that
27 was not freed, as well as the max wasted amount during the run. The
28 list is sorted by descending order of wasted bytes after the run.
29 Function Waste Alloc req TotAlloc TotReq MaxAlloc MaxReq MaxWaste
31 -------- ----- ----- --- -------- ------ -------- ------ --------
32 rb_allocate_cpu_buffer 768 2304 1536 2304 1536 2304 1536 768
33 alloc_pipe_info 400 1152 752 1152 752 1152 752 400
34 instance_mkdir 252 544 292 544 292 544 292 252
35 __d_alloc 215 1086560 1086345 1087208 1086993 1086560 1086345 215
36 get_empty_filp 72 2304 2232 4864 4712 4864 4712 152
37 mm_alloc 40 960 920 960 920 960 920 40
38 prepare_creds 32 192 160 1728 1440 1728 1440 288
39 tracing_buffers_open 8 32 24 32 24 32 24 8
40 do_brk 0 0 0 368 368 368 368 0
41 journal_add_journal_head 0 6048 6048 6048 6048 6048 6048 0
42 journal_start 0 0 0 1224 1224 48 48 0
43 __rb_allocate_pages 0 3289856 3289856 3289856 3289856 3289856 3289856 0
44 anon_vma_alloc 0 0 0 936 936 864 864 0
45 [...]
46
48 -i input-file
49 By default, trace-cmd hist will read the file trace.dat. But the -i
50 option open up the given input-file instead. Note, the input file
51 may also be specified as the last item on the command line.
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54 trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1),
55 trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1),
56 trace-cmd-reset(1), trace-cmd-hist(1), trace-cmd-split(1),
57 trace-cmd-listen(1)
58
60 Written by Steven Rostedt, <rostedt@goodmis.org[1]>
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63 https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/
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66 Copyright (C) 2013 Red Hat, Inc. Free use of this software is granted
67 under the terms of the GNU Public License (GPL).
68
70 1. rostedt@goodmis.org
71 mailto:rostedt@goodmis.org
72libtracefs 10/11/2022 TRACE-CMD-MEM(1)