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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-13 11:24:24 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-13 12:57:00 +0200 |
| commit | 6861f8f0c7b0e46f9af4cc78993794c89c5a99f1 (patch) | |
| tree | a2fde27933ef45f660790a27ee9848b04c3b425f /man5 | |
| parent | eb8487082c08e1ea7f8da22805dd4773310797a6 (diff) | |
| download | man-pages-6861f8f0c7b0e46f9af4cc78993794c89c5a99f1.tar.gz | |
proc.5: Improve description of the KernelPageSize and MMUPageSize 'smaps' fields
Rework the text, make it clearer that MMUPageSize is a separate
line, add kernel version numbers, and example output.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man5')
| -rw-r--r-- | man5/proc.5 | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/man5/proc.5 b/man5/proc.5 index efd15e6fff..a7b56e2ef1 100644 --- a/man5/proc.5 +++ b/man5/proc.5 @@ -1658,6 +1658,8 @@ ShmemPmdMapped: 0 kB Swap: 0 kB KernelPageSize: 4 kB MMUPageSize: 4 kB +KernelPageSize: 4 kB +MMUPageSize: 4 kB Locked: 0 kB VmFlags: rd ex mr mw me dw @@ -1678,13 +1680,15 @@ that does not belong to any file. "Swap" shows how much would-be-anonymous memory is also used, but out on swap. -The "KernelPageSize" entry is the page size used by the kernel to back a VMA. +The "KernelPageSize" line (available since Linux 2.6.29) +is the page size used by the kernel to back the virtual memory area. This matches the size used by the MMU in the majority of cases. However, one counter-example occurs on PPC64 kernels -whereby a kernel using 64K as a base page size may still use 4K +whereby a kernel using 64kB as a base page size may still use 4kB pages for the MMU on older processors. -To distinguish, this -patch reports "MMUPageSize" as the page size used by the MMU. +To distinguish the two attributes, the "MMUPageSize" line +(also available since Linux 2.6.29) +reports the page size used by the MMU. The "Locked" indicates whether the mapping is locked in memory or not. |