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freebsd: rework system memory usage

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Change the value of memory usage from:

  Used   = Wired
  Free   = Total - Wired
  Shared = 0
  Buffer = 0
  Cached = Cache
  User   = Wired - Cache
  Locked = Not Supported

To:

  Used   = Total - Free
  Free   = Free
  Shared = 0
  Buffer = Buf
  Cached = Cache
  User   = Active + Wired
  Locked = Not Supported

The left-hand side means fields in the glibtop_mem struct and the right-hand
side means the value showed by `top' command. This change should make the value
showed by gnome-system-monitor, which uses `User' field, become closer to
the real memory usage.

All sysctlbyname code in sysdeps/freebsd/mem.c has been moved to separate
functions to make the code cleaner.
This commit is contained in:
Ting-Wei Lan
2015-05-02 21:36:22 +08:00
parent 58ca70eaee
commit a206cfc728
1 changed files with 39 additions and 28 deletions
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67
sysdeps/freebsd/mem.c
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@@ -45,46 +45,57 @@ _glibtop_init_mem_s (glibtop *server)
server->sysdeps.mem = _glibtop_sysdeps_mem;
}
static gulong mem_get_by_bytes (glibtop *server, const char *name) {
gulong result = 0;
size_t len = sizeof (result);
if (sysctlbyname (name, &result, &len, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl (%s)", name);
}
return result;
}
static gulong mem_get_by_pages (glibtop *server, const char *name) {
guint result = 0;
size_t len = sizeof (result);
if (sysctlbyname (name, &result, &len, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl (%s)", name);
}
return (gulong) result * pagesize;
}
void
glibtop_get_mem_s (glibtop *server, glibtop_mem *buf)
{
gulong memtotal;
guint memused;
gulong buffers;
guint cached;
size_t len;
gulong memactive;
gulong meminactive;
gulong memwired;
gulong memcached;
gulong membuffer;
gulong memfree;
glibtop_init_s (&server, GLIBTOP_SYSDEPS_MEM, 0);
memset (buf, 0, sizeof *buf);
len = sizeof (memtotal);
if (sysctlbyname ("hw.physmem", &memtotal, &len, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl (hw.physmem)");
return;
}
len = sizeof (memused);
if (sysctlbyname ("vm.stats.vm.v_wire_count", &memused, &len, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl (vm.stats.vm.v_wire_count)");
return;
}
len = sizeof (cached);
if (sysctlbyname ("vm.stats.vm.v_cache_count", &cached, &len, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl (vm.stats.vm.v_cache_count)");
return;
}
buffers = 0;
memtotal = mem_get_by_bytes (server, "hw.physmem");
memactive = mem_get_by_pages (server, "vm.stats.vm.v_active_count");
meminactive = mem_get_by_pages (server, "vm.stats.vm.v_inactive_count");
memwired = mem_get_by_pages (server, "vm.stats.vm.v_wire_count");
memcached = mem_get_by_pages (server, "vm.stats.vm.v_cache_count");
membuffer = mem_get_by_bytes (server, "vfs.bufspace");
memfree = mem_get_by_pages (server, "vm.stats.vm.v_free_count");
buf->total = memtotal;
buf->used = (memused * (gulong) pagesize);
buf->free = (buf->total - buf->used);
buf->used = memtotal - memfree;
buf->free = memfree;
buf->shared = 0;
buf->cached = (cached * (gulong) pagesize);
buf->buffer = buffers;
buf->buffer = membuffer;
buf->cached = memcached;
buf->locked = 0;
buf->user = buf->total - buf->free - buf->cached - buf->buffer;
buf->user = memactive + memwired;
buf->flags = _glibtop_sysdeps_mem;
}