How to print out explicitly the memory footprint of the kernel

Alain De Vos

Alain De Vos

How to find out how much physical memory is used by the kernel and its buffers ?
Currently I have 4.7G wired memory with around 0.7G resident memory used by zfs-arc and around 1.2G used by xorg and around 1.2G used by firefox.
I wonder where the rest is gone.
I found : vm.kmem_map_size: 3100921856
Maybe this is a bit large.
 
Interesting, kldstat -hvd | grep M returns,
Code: 
1  254 0xffffffff80200000   22M kernel (/boot/kernel/kernel)
8    1 0xffffffff81e53000  1.3M radeonkms.ko (/boot/modules/radeonkms.ko)
19    1 0xffffffff82064000  201K radeon_SUMO_uvd_bin.ko (/boot/modules/radeon_SUMO_uvd_bin.ko)
        336 radeon_SUMO_uvd_bin_fw (0, 0, 0x0)
69    1 0xffffffff8223b000  2.3M zfs.ko (/boot/kernel/zfs.ko)
82    1 0xffffffff824eb000  5.2M vmm.ko (/boot/kernel/vmm.ko)
These are not spectacular sizes. But after tuning the parameters a bit, sysctl vm.kmem_map_size returns 630398976
 
I think you can consider it a pain to figure that out in detail.
Usually ARC < kmem_map_size < wired.
Then, the actual use can somehow be collected from vmstat -m and vmstat -z.
What kldstat reports, seem to be the code-segment sizes only.
 
vmstat -m | grep M returns
Code: 
UMAHash    Memuse 1572K
vmstat -z
UMA Slabs Used 92282
VM OBJECT Used 91755
MAP ENTRY Used 43598
 
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