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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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22
proc/sysinfo.c
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@ -697,17 +697,21 @@ nextline:
kb_main_used = kb_main_total - kb_main_free;
/* zero? might need fallback for 2.6.27 <= kernel <? 3.14 */
if (!kb_main_available && linux_version_code >= 20627) {
vminfo();
watermark_low = vm_min_free * 5 / 4; /* should be equal to sum of all 'low' fields in /proc/zoneinfo */
if (!kb_main_available) {
if (linux_version_code < 20627)
kb_main_available = kb_main_free;
else {
vminfo();
watermark_low = vm_min_free * 5 / 4; /* should be equal to sum of all 'low' fields in /proc/zoneinfo */
mem_available = (signed long)vm_nr_free_pages + vm_nr_inactive_file + vm_nr_active_file
- MIN((vm_nr_inactive_file + vm_nr_active_file) / 2, watermark_low)
+ vm_nr_slab_reclaimable - MIN(vm_nr_slab_reclaimable / 2, watermark_low)
- watermark_low;
mem_available = (signed long)vm_nr_free_pages + vm_nr_inactive_file + vm_nr_active_file
- MIN((vm_nr_inactive_file + vm_nr_active_file) / 2, watermark_low)
+ vm_nr_slab_reclaimable - MIN(vm_nr_slab_reclaimable / 2, watermark_low)
- watermark_low;
if (mem_available < 0) mem_available = 0;
kb_main_available = (unsigned long)((unsigned long long)mem_available * page_bytes / 1024ull);
if (mem_available < 0) mem_available = 0;
kb_main_available = (unsigned long)((unsigned long long)mem_available * page_bytes / 1024ull);
}
}
}