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more concise memory calculation on Linux

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more flexible parsing for /proc/meminfo to take shared and reclaimable
memory into account. this matches the output with free(1).

additionally this could fix some corner cases, as the order of fields in
/proc/meminfo is not strictly defined.

slstatus:
percent 81% free 2.5 Gi total 23.4 Gi used 19.0 Gi

free(1):
               total        used        free      shared  buff/cache   available
Mem:            23Gi        19Gi       2.5Gi       1.3Gi       3.2Gi       3.6Gi
This commit is contained in:
drkhsh
2025-07-24 22:41:25 +02:00
parent 6eb7887853
commit 8723e8b8c6
3 changed files with 57 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

61
components/ram.c
View File

@@ -11,36 +11,45 @@
ram_free(const char *unused)
{
uintmax_t free;
FILE *fp;
if (pscanf("/proc/meminfo",
"MemTotal: %ju kB\n"
"MemFree: %ju kB\n"
"MemAvailable: %ju kB\n",
&free, &free, &free) != 3)
if (!(fp = fopen("/proc/meminfo", "r")))
return NULL;
if (lscanf(fp, "MemFree:", "%ju kB", &free) != 1) {
fclose(fp);
return NULL;
}
fclose(fp);
return fmt_human(free * 1024, 1024);
}
const char *
ram_perc(const char *unused)
{
uintmax_t total, free, buffers, cached;
uintmax_t total, free, buffers, cached, shmem, sreclaimable;
int percent;
FILE *fp;
if (pscanf("/proc/meminfo",
"MemTotal: %ju kB\n"
"MemFree: %ju kB\n"
"MemAvailable: %ju kB\n"
"Buffers: %ju kB\n"
"Cached: %ju kB\n",
&total, &free, &buffers, &buffers, &cached) != 5)
if (!(fp = fopen("/proc/meminfo", "r")))
return NULL;
if (lscanf(fp, "MemTotal:", "%ju kB", &total) != 1 ||
lscanf(fp, "MemFree:", "%ju kB", &free) != 1 ||
lscanf(fp, "Buffers:", "%ju kB", &buffers) != 1 ||
lscanf(fp, "Cached:", "%ju kB", &cached) != 1 ||
lscanf(fp, "Shmem:", "%ju kB", &shmem) != 1 ||
lscanf(fp, "SReclaimable:", "%ju kB", &sreclaimable) != 1) {
fclose(fp);
return NULL;
}
fclose(fp);
if (total == 0)
return NULL;
percent = 100 * ((total - free) - (buffers + cached)) / total;
percent = 100 * (total - free - buffers - cached - sreclaimable + shmem) / total;
return bprintf("%d", percent);
}
@@ -59,18 +68,24 @@
const char *
ram_used(const char *unused)
{
uintmax_t total, free, buffers, cached, used;
uintmax_t total, free, buffers, cached, used, shmem, sreclaimable;
FILE *fp;
if (pscanf("/proc/meminfo",
"MemTotal: %ju kB\n"
"MemFree: %ju kB\n"
"MemAvailable: %ju kB\n"
"Buffers: %ju kB\n"
"Cached: %ju kB\n",
&total, &free, &buffers, &buffers, &cached) != 5)
if (!(fp = fopen("/proc/meminfo", "r")))
return NULL;
used = (total - free - buffers - cached);
if (lscanf(fp, "MemTotal:", "%ju kB", &total) != 1 ||
lscanf(fp, "MemFree:", "%ju kB", &free) != 1 ||
lscanf(fp, "Buffers:", "%ju kB", &buffers) != 1 ||
lscanf(fp, "Cached:", "%ju kB", &cached) != 1 ||
lscanf(fp, "Shmem:", "%ju kB", &shmem) != 1 ||
lscanf(fp, "SReclaimable:", "%ju kB", &sreclaimable) != 1) {
fclose(fp);
return NULL;
}
fclose(fp);
used = total - free - buffers - cached - sreclaimable + shmem;
return fmt_human(used * 1024, 1024);
}
#elif defined(__OpenBSD__)