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free: use SReclaimable in cached 

The previous commit added all of slab into the cache value. The
thing was is cached in this context is something you can get
back and reclaim if under memory pressure.

The problem was slab parameter includes both reclaimable and
unreclaimable values which doesn't make sense in this context.
This commit make cached only use the reclaimable component.

References:
 http://www.freelists.org/post/procps/OmegaPhilxxxxxxxxxxxxx-Bug799716-free-considers-cached-to-include-SUnreclaim
 https://github.com/brndnmtthws/conky/issues/130
 https://bugs.debian.org/799716

Commits:
 05d751c4f0
 6cb75efef8
This commit is contained in:
Craig Small 2015-10-24 14:29:25 +11:00
parent 88489be542
commit 602b9a02ce
2 changed files with 5 additions and 2 deletions
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2
free.1
View File

@ -32,7 +32,7 @@ kernels 2.6.32, displayed as zero if not available)
Memory used by kernel buffers (Buffers in /proc/meminfo)
.TP
\fBcache\fR
Memory used by the page cache and slabs (Cached and Slab in /proc/meminfo)
Memory used by the page cache and slabs (Cached and SReclaimable in /proc/meminfo)
.TP
\fBbuff/cache\fR
Sum of \fBbuffers\fR and \fBcache\fR

5
proc/meminfo.c
View File

@ -49,6 +49,7 @@ struct meminfo_data {
unsigned long total;
unsigned long used;
unsigned long slab;
unsigned long slab_reclaimable;
unsigned long swap_free;
unsigned long swap_total;
unsigned long swap_used;
@ -185,6 +186,8 @@ PROCPS_EXPORT int procps_meminfo_read (
case 'S':
if (0 == strcmp(head, "Slab:"))
valptr = &(info->data.slab);
if (0 == strcmp(head, "SReclaimable:"))
valptr = &(info->data.slab_reclaimable);
else if (0 == strcmp(head, "SwapFree:"))
valptr = &(info->data.swap_free);
else if (0 == strcmp(head, "SwapTotal:"))
@ -212,7 +215,7 @@ PROCPS_EXPORT int procps_meminfo_read (
if (0 == info->data.available) {
info->data.available = info->data.free;
}
info->data.cached += info->data.slab;
info->data.cached += info->data.slab_reclaimable;
info->data.swap_used = info->data.swap_total - info->data.swap_free;
/* if 'available' is greater than 'total' or our calculation of mem_used