On 08/04/2010 09:55 AM, Pawel Osciak wrote:
Hi Richard,
Richard Röjfors wrote:
This patch adds another init functions in the videobuf-dma-contig
which is named _cached in the end. It creates a buffer factory
which allocates buffers using kmalloc and the buffers are cached.
Before I review this in more detail, could you elaborate more on
this? How large are your buffers, can kmalloc really allocate them
for you? I am not convinced how this is supposed to work reliably,
especially in a long-running systems.
The buffers are normally 829440 bytes and yes kmalloc can allocate them.
Normally userspace apps seem to request two buffers of this size.
How do you propose to allocate the buffers? They need to be contiguous
and using uncached memory gave really bad performance.
--Richard
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