sar: Update manual page

Explain new "available free memory" metric in sar's manual page.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>

diff --git a/man/sar.in b/man/sar.in
index a71f350ddcbdc5d935227c41101b8188f6fcd238..2d5c67058aa1cefed641763b173b0c3088fa4f4e 100644 (file)
--- a/man/sar.in
+++ b/man/sar.in
@@ -1,4 +1,4 @@
-.TH SAR 1 "OCTOBER 2016" Linux "Linux User's Manual" -*- nroff -*-
+.TH SAR 1 "NOVEMBER 2016" Linux "Linux User's Manual" -*- nroff -*-
 .SH NAME
 sar \- Collect, report, or save system activity information.
 .SH SYNOPSIS
@@ -1938,6 +1938,16 @@ The following values may be displayed:
 Amount of free memory available in kilobytes.
 .RE
 
+.B kbavail
+.RS
+Estimate of how much memory in kilobytes is available for starting new
+applications, without swapping.
+The estimate takes into account that the system needs some page cache to
+function well, and that not all reclaimable slab will be reclaimable,
+due to items being in use. The impact of those factors will vary from
+system to system.
+.RE
+
 .B kbmemused
 .RS
 Amount of used memory in kilobytes. This does not take into account memory