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