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Editorial Team
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Asked: 2026-05-24T11:01:59+00:00

I want to see the precise amount of memory each processes use as anonymous

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I want to see the precise amount of memory each processes
use as anonymous page, because anonymous memory cannot be
paged out, thus tracking this usage precisely is important.

One way to get the whole sum of anonymous page is to read /proc/meminfo AnonPages.

The other way is to add up all the entries in smaps file which matches follows:

  • no name
  • [stack]
  • [heap]
  • /dev/zero
  • /dev/shm/…
  • Relocated section private_dirty

    Section used for relocation would be updated for each process,
    which makes some private_dirty region in a named mapping region.
    Elf loader seems to change read/write attribute using mprotect
    when doing relocation, so it is difficult to differentiate such
    region from a data section, and making
    it difficult to track these usage from each process
    point of view

So I would like to know how to differentiate the above
relocated section, and to precisely track the anonymous
memory usage for each processes.

Maybe we should add new entry in /proc/*/smaps to show
the amount of Anonymous memory for each section.

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  1. Editorial Team
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