Freeing kernel memory

[Abraham Arce <abraham.arce.moreno@xxxxxxxxx>]

Hi,

I am looking for a way to free memory once we have created/transfer
data. The purpose is to create one file under a specific device, then
transfer it to another device while getting the performance, this way
we could have performance measurements among

 mtd <> mmc/sd <> ram <> usb

sync is our first option to flush data then writing to
/proc/sys/vm/drop_caches will free pagecache, dentries and inodes, is
this correct? any other option you may know?

Thanks for your inputs
Abraham

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