Re: computing drop-able caches

On 02/10/2016 10:13 AM, Dave Hansen wrote:

On 02/10/2016 10:04 AM, Daniel Walker wrote:

quoted

quoted

[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

Ok, then this looks like a defect then. I would think MemAvailable would 
always be smaller then MemFree (after echo 3 > 
/proc/sys/vm/drop_caches).. Unless there is something else be accounted 
for that we aren't aware of.

Daniel

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