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SubjectRe: computing drop-able caches
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On 02/10/2016 10:13 AM, Dave Hansen wrote:
> 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
>
>

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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