trace-cmd-mem - Man Page

trace-cmd mem [Options][input-file]

The trace-cmd(1) mem requires a trace-cmd record that enabled the following events:

kmalloc
kmalloc_node
kfree
kmem_cache_alloc
kmem_cache_alloc_node
kmem_cache_alloc_free

It then reads the amount requested and the ammount freed as well as the functions that called the allocation​. It then reports the final amount of bytes requested and allocated, along with the total amount allocated and requested, as well as the max allocation and requested during the run​. It reports the amount of wasted bytes (allocated - requested) that was not freed, as well as the max wasted amount during the run​. The list is sorted by descending order of wasted bytes after the run​.

        Function                Waste   Alloc   req             TotAlloc     TotReq             MaxAlloc     MaxReq     MaxWaste
        --------                -----   -----   ---             --------     ------             --------     ------     --------
  rb_allocate_cpu_buffer        768     2304    1536                2304       1536                 2304       1536     768
         alloc_pipe_info        400     1152    752                 1152        752                 1152        752     400
          instance_mkdir        252     544     292                  544        292                  544        292     252
               __d_alloc        215     1086560 1086345          1087208    1086993              1086560    1086345     215
          get_empty_filp        72      2304    2232                4864       4712                 4864       4712     152
                mm_alloc        40      960     920                  960        920                  960        920     40
           prepare_creds        32      192     160                 1728       1440                 1728       1440     288
    tracing_buffers_open        8       32      24                    32         24                   32         24     8
                  do_brk        0       0       0                    368        368                  368        368     0
journal_add_journal_head        0       6048    6048                6048       6048                 6048       6048     0
           journal_start        0       0       0                   1224       1224                   48         48     0
     __rb_allocate_pages        0       3289856 3289856          3289856    3289856              3289856    3289856     0
          anon_vma_alloc        0       0       0                    936        936                  864        864     0
                                                        [​.​.​.]

-i input-file

By default, trace-cmd hist will read the file trace​.dat​. But the -i option open up the given input-file instead​. Note, the input file may also be specified as the last item on the command line​.

trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-hist(1), trace-cmd-split(1), trace-cmd-listen(1)

Written by Steven Rostedt, <rostedt@goodmis​.org​^[1]>

https://git​.kernel​.org/pub/scm/utils/trace-cmd/trace-cmd​.git/

Copyright (C) 2013 Red Hat, Inc​. Free use of this software is granted under the terms of the GNU Public License (GPL)​.

1.

rostedt@goodmis.org
mailto:rostedt@goodmis.org