Hi Florian,

Can you please describe in more details, what would you expect from
such special abstraction layer regarding buffer managers? I'd like to
understand more of your expectations and evaluate possible work.

Best regards,
Marcin

2015-11-30 17:25 GMT+01:00 David Miller [off-list ref]:

From: Marcin Wojtas <redacted>
Date: Mon, 30 Nov 2015 15:13:22 +0100

quoted

What kind of abstraction and helpers do you mean? Some kind of API
(e.g. bm_alloc_buffer, bm_initialize_ring bm_put_buffer,
bm_get_buffer), which would be used by platform drivers (and specific
aplications if one wants to develop on top of the kernel)?

In general, what is your top-view of such solution and its cooperation
with the drivers?

The tricky parts involved have to do with allocating pages for the
buffer pools and minimizing the number of atomic refcounting
operations on those pages for for the puts and gets, particularly
around buffer replenish runs.

For example, if you're allocating a page for a buffer pool the device
will chop into N (for any N < PAGE_SIZE) byte pieces, you can
eliminate many atomic operations.