Re: computing drop-able caches

[Dave Hansen]

On 02/10/2016 10:04 AM, Daniel Walker wrote:
>> [Linux_0:/]$ echo 3 > /proc/sys/vm/drop_caches
>> [Linux_0:/]$ cat /proc/meminfo
>> MemTotal:        3977836 kB
>> MemFree:         1095012 kB
>> MemAvailable:    1434148 kB
> 
> I suspect MemAvailable takes into account more than just the droppable
> caches. For instance, reclaimable slab is included, but I don't think
> drop_caches drops that part.

There's a bit for page cache and a bit for slab, see:

	https://kernel.org/doc/Documentation/sysctl/vm.txt