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library: evolve MenAvailable algorithm on older kernel

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Let's not report zero for kb_main_available when older
kernels don't have MemAvailable. Instead, if we simply
duplicate the 'free' amount we can avoid all ancillary
problems, such as those involving top's graphing mode.

Reference(s):
http://www.freelists.org/post/procps/kb-main-available-etc,3

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2014-07-19 04:44:44 -05:00
committed by Jaromir Capik
parent 7391699b07
commit c437faf8d3
3 changed files with 16 additions and 12 deletions
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@ -482,8 +482,8 @@ The \fBavail\fR number on line 2 is an estimation of \*(MP available for
starting new applications, without swapping.
Unlike the \fBfree\fR field, it attempts to account for readily reclaimable
page cache and memory slabs.
It is available on kernels 3.14, emulated on kernels 2.6.27+ and displayed
as zero otherwise.
It is available on kernels 3.14, emulated on kernels 2.6.27+, otherwise
the same as \fBfree\fR.
In the alternate memory display modes, two abbreviated summary lines
are shown consisting of these elements: