On Wed, 2016-02-10 at 11:11 -0800, Daniel Walker wrote: > 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. echo 3 > /proc/sys/vm/drop_caches will only drop unmapped page cache, IIRC The system may still have a number of page cache pages left that are mapped in processes, but will be reclaimable if the VM needs the memory for something else. -- All rights reversed
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