Re: Question about the TPM driver

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Mon, 2018-09-17 at 10:32 -0300, Martin Galvan wrote:
> El dom., 16 sept. 2018 a las 16:16, Jarkko Sakkinen
> (<jarkko.sakkinen@linux.intel.com>) escribio:
> > I understand your concerns but without a concrete workload there is
> > no
> > problem with this behavior.
> 
> IMHO it's a bit excessive to allocate 4k to end up storing than 100
> bytes. Beyond that, it's a pretty big gotcha for someone who's
> writing software which talks to the driver :)

It's what we do in the kernel, which is one of our most memory
constrained environments.

You have to remember that sub page size buffers aren't always managed
the best at any level (they usually fragment the heap) so even in a
constrained memory environment, a 4k buffer (4k aligned) is usually
preferable.

James