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| author | Justin Lebar <justin.lebar@gmail.com> | 2012-12-26 23:22:38 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2012-12-26 23:47:50 +0100 |
| commit | 04dcb3c8f880736f42db87cb2691f64d9f114f9b (patch) | |
| tree | 8c82512df83373eaa97fee148b954963b67b05ad | |
| parent | 4cb1deb76f235b30bec7e118bbebeae66336d6ef (diff) | |
| download | man-pages-04dcb3c8f880736f42db87cb2691f64d9f114f9b.tar.gz | |
proc.5: statm's "shared" field refers to pages backed by files
I noticed that statm's "shared" field doesn't match the sum of
all the "shared" entries in smaps [1].
The kernel docs explain that statm's "shared" field is "number of
pages that are shared (i.e. backed by a file)" [2]. smaps appears
to call a page shared if it's mapped by at least two processes,
which explains this discrepancy.
I'm not a kernel hacker, but it appears to me they do mean "i.e."
and not "e.g." in the statm description: In
fs/proc/task_mmu.c::task_statm, I see
*shared = get_mm_counter(mm, MM_FILEPAGES);
Here's a patch which updates the man page to match the (hopefully
correct) kernel docs.
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=807181
[2] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=Documentation/filesystems/proc.txt;h=a1793d670cd01bd374eddf54ffdfc768504291ff;hb=HEAD
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man5/proc.5 | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/man5/proc.5 b/man5/proc.5 index e205052529..8c24e255e3 100644 --- a/man5/proc.5 +++ b/man5/proc.5 @@ -1026,7 +1026,7 @@ size total program size (same as VmSize in \fI/proc/[pid]/status\fP) resident resident set size (same as VmRSS in \fI/proc/[pid]/status\fP) -share shared pages (from shared mappings) +share shared pages (i.e., backed by a file) text text (code) .\" (not including libs; broken, includes data segment) lib library (unused in Linux 2.6) |