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top: exploit new kb_main_available, make Jaromir happy

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This patch will trade a former pessimistic calculation
of free physical memory for a more optimistic one that
uses the newly added kb_main_available library export.

But in case one might wish to return to the old former
method, there's a new #define that was made available.

[ the new calculation will affect graphing mode only ]

Reference(s):
http://www.freelists.org/post/procps/systemd-support-to-library,9

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2014-07-17 13:13:13 -05:00
committed by Jaromir Capik
parent 9500dc198c
commit d310a18fc2
4 changed files with 29 additions and 12 deletions
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@@ -470,14 +470,21 @@ with the `E' \*(CI.
As a default, Line 1 reflects \*(MP, classified as:
.nf
total, used, free and buffers
total, free, used and buff/cache
.fi
Line 2 reflects mostly \*(MV, classified as:
.nf
total, used, free and cached (which is \*(MP)
total, free, used and avail (which is \*(MP)
.fi
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.
In the alternate memory display modes, two abbreviated summary lines
are shown consisting of these elements:
.nf
@@ -489,9 +496,10 @@ are shown consisting of these elements:
Where: a) is the percentage used; b) is the total available; and c) is one of two
visual graphs of those representations.
In the case of \*(MP, the percentage includes the sum of \fBused\fR, \fBbuffers\fR
and \fBcached\fR memory noted above.
The `Mem' graph itself is divided between \fBused\fR then \fBbuffers\fR and \fBcached\fR combined.
In the case of \*(MP, the percentage represents the \fBtotal\fR minus the estimated
\fBavail\fR noted above.
The `Mem' graph itself is divided between \fBused\fR the any remaining memory not
otherwise accounted for by \fBavail\fR.
\*(XT 4b. SUMMARY AREA Commands and the `m' command for additional information
on that special 4-way toggle.