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library: add chaining provisions to meminfo and vmstat

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If a caller chooses to reduce the overhead of repeated
function calls, this commit provides for acquiring all
the desired information in just a single library call.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2015-06-28 00:00:00 -05:00
committed by Craig Small
parent 7a98cab187
commit a05084f381
5 changed files with 127 additions and 0 deletions
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82
proc/meminfo.c
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@@ -279,3 +279,85 @@ PROCPS_EXPORT unsigned long procps_meminfo_get (
}
return 0;
}
PROCPS_EXPORT int procps_meminfo_get_chain (
struct procps_meminfo *info,
struct meminfo_result *item)
{
if (item == NULL)
return -EINVAL;
do {
switch (item->item) {
case PROCPS_MEM_ACTIVE:
item->result = info->data.active;
break;
case PROCPS_MEM_INACTIVE:
item->result = info->data.inactive;
break;
case PROCPS_MEMHI_FREE:
item->result = info->data.high_free;
break;
case PROCPS_MEMHI_TOTAL:
item->result = info->data.high_total;
break;
case PROCPS_MEMHI_USED:
if (info->data.high_free > info->data.high_total)
item->result = 0;
else
item->result = info->data.high_total - info->data.high_free;
break;
case PROCPS_MEMLO_FREE:
item->result = info->data.low_free;
break;
case PROCPS_MEMLO_TOTAL:
item->result = info->data.low_total;
break;
case PROCPS_MEMLO_USED:
if (info->data.low_free > info->data.low_total)
item->result = 0;
else
item->result = info->data.low_total - info->data.low_free;
break;
case PROCPS_MEM_AVAILABLE:
item->result = info->data.available;
break;
case PROCPS_MEM_BUFFERS:
item->result = info->data.buffers;
break;
case PROCPS_MEM_CACHED:
item->result = info->data.cached;
break;
case PROCPS_MEM_FREE:
item->result = info->data.free;
break;
case PROCPS_MEM_SHARED:
item->result = info->data.shared;
break;
case PROCPS_MEM_TOTAL:
item->result = info->data.total;
break;
case PROCPS_MEM_USED:
item->result = info->data.used;
break;
case PROCPS_SWAP_FREE:
item->result = info->data.swap_free;
break;
case PROCPS_SWAP_TOTAL:
item->result = info->data.swap_total;
break;
case PROCPS_SWAP_USED:
if (info->data.swap_free > info->data.swap_total)
item->result = 0;
else
item->result = info->data.swap_total - info->data.swap_free;
break;
default:
return -EINVAL;
}
item = item->next;
} while (item);
return 0;
}