What: /proc/pid/smaps_rollup
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Date: August 2017
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Contact: Daniel Colascione <dancol@google.com>
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Description:
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This file provides pre-summed memory information for a
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process. The format is almost identical to /proc/pid/smaps,
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except instead of an entry for each VMA in a process,
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smaps_rollup has a single entry (tagged "[rollup]")
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for which each field is the sum of the corresponding
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fields from all the maps in /proc/pid/smaps.
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Additionally, the fields Pss_Anon, Pss_File and Pss_Shmem
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are not present in /proc/pid/smaps. These fields represent
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the sum of the Pss field of each type (anon, file, shmem).
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For more details, see Documentation/filesystems/proc.rst
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and the procfs man page.
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Typical output looks like this::
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00100000-ff709000 ---p 00000000 00:00 0 [rollup]
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Size: 1192 kB
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KernelPageSize: 4 kB
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MMUPageSize: 4 kB
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Rss: 884 kB
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Pss: 385 kB
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Pss_Anon: 301 kB
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Pss_File: 80 kB
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Pss_Shmem: 4 kB
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Shared_Clean: 696 kB
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Shared_Dirty: 0 kB
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Private_Clean: 120 kB
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Private_Dirty: 68 kB
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Referenced: 884 kB
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Anonymous: 68 kB
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LazyFree: 0 kB
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AnonHugePages: 0 kB
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ShmemPmdMapped: 0 kB
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Shared_Hugetlb: 0 kB
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Private_Hugetlb: 0 kB
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Swap: 0 kB
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SwapPss: 0 kB
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Locked: 385 kB
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