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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/Documentation/ABI/testing/procfs-smaps_rollup
....@@ -3,29 +3,39 @@
33 Contact:	Daniel Colascione <dancol@google.com>
44 Description:
55 		This file provides pre-summed memory information for a
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-		process.  The format is identical to /proc/pid/smaps,
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+		process.  The format is almost identical to /proc/pid/smaps,
77 		except instead of an entry for each VMA in a process,
88 		smaps_rollup has a single entry (tagged "[rollup]")
99 		for which each field is the sum of the corresponding
1010 		fields from all the maps in /proc/pid/smaps.
11
-		For more details, see the procfs man page.
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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.
1216 
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-		Typical output looks like this:
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+		Typical output looks like this::
1418 
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-		00100000-ff709000 ---p 00000000 00:00 0		 [rollup]
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-		Rss:		     884 kB
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-		Pss:		     385 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
28
-		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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+			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