Provides a better measure of actual system memory usage for Luci/users.
"cached" will be used to add a new progress bar, "available" is the
kernel's estimate of memory that is actually useable, and is more
accurate than (memory.free + memory.buffered) that Luci currently uses
to calculate available memory.
Signed-off-by: Zachary Cook <zachcook1...@gmail.com>
---
system.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/system.c b/system.c
index 751a016..e5a4f5f 100644
--- a/system.c
+++ b/system.c
@@ -230,9 +230,36 @@ static int system_info(struct ubus_context *ctx, struct
ubus_object *obj,
#ifdef linux
struct sysinfo info;
void *c;
+ char line[256];
+ char *key, *val;
+ unsigned long long available, cached;
+ FILE *f;
if (sysinfo(&info))
return UBUS_STATUS_UNKNOWN_ERROR;
+
+ if ((f = fopen("/proc/meminfo", "r")) == NULL)
+ return UBUS_STATUS_UNKNOWN_ERROR;
+
+ /* if linux < 3.14 MemAvailable is not in meminfo */
+ available = 0;
+ cached = 0;
+
+ while(fgets(line, sizeof(line), f))
+ {
+ key = strtok(line, " :");
+ val = strtok(NULL, " ");
+
+ if (!key || !val)
+ continue;
+
+ if (!strcasecmp(key, "MemAvailable"))
+ available = 1024 * atoll(val);
+ else if (!strcasecmp(key, "Cached"))
+ cached = 1024 * atoll(val);
+ }
+
+ fclose(f);
#endif
now = time(NULL);
@@ -262,6 +289,8 @@ static int system_info(struct ubus_context *ctx, struct
ubus_object *obj,
(uint64_t)info.mem_unit * (uint64_t)info.sharedram);
blobmsg_add_u64(&b, "buffered",
(uint64_t)info.mem_unit * (uint64_t)info.bufferram);
+ blobmsg_add_u64(&b, "available",available);
+ blobmsg_add_u64(&b, "cached", cached);
blobmsg_close_table(&b, c);
c = blobmsg_open_table(&b, "swap");
--
2.23.0
_______________________________________________
openwrt-devel mailing list
openwrt-devel@lists.openwrt.org
https://lists.openwrt.org/mailman/listinfo/openwrt-devel
