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free: support for MemAvailable

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This commit adds a new switch -a/--available that
appends a new column called 'available' to the
output. The column displays an estimation
of how much memory is available for starting
new applications, without swapping. Unlike the data
provided by the 'cached' or 'free' fields, this
field takes into account page cache and also that
not all reclaimable memory slabs will be reclaimed
due to items being in use.
This commit is contained in:
Jaromir Capik
2014-07-11 22:34:06 +02:00
parent e751606fcc
commit ba6396f886
5 changed files with 27 additions and 2 deletions
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1
proc/libprocps.sym
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@ -26,6 +26,7 @@ global:
kb_inactive;
kb_low_free;
kb_low_total;
kb_main_available;
kb_main_buffers;
kb_main_cached;
kb_main_free;

2
proc/sysinfo.c
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@ -573,6 +573,7 @@ unsigned long kb_high_free;
unsigned long kb_high_total;
unsigned long kb_low_free;
unsigned long kb_low_total;
unsigned long kb_main_available;
/* 2.4.xx era */
unsigned long kb_active;
unsigned long kb_inact_laundry;
@ -629,6 +630,7 @@ void meminfo(void){
{"LowFree", &kb_low_free},
{"LowTotal", &kb_low_total},
{"Mapped", &kb_mapped}, // kB version of vmstat nr_mapped
{"MemAvailable", &kb_main_available}, // important
{"MemFree", &kb_main_free}, // important
{"MemTotal", &kb_main_total}, // important
{"NFS_Unstable", &kb_nfs_unstable},

1
proc/sysinfo.h
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@ -34,6 +34,7 @@ extern unsigned long kb_high_free;
extern unsigned long kb_high_total;
extern unsigned long kb_low_free;
extern unsigned long kb_low_total;
extern unsigned long kb_main_available;
/* 2.4.xx era */
extern unsigned long kb_active;
extern unsigned long kb_inact_laundry; // grrr...