Hi all,
Our problem is about shmem usage so far. After some discussions we
believe we have an acceptable solution: add a new flag to
odp_shm_reserve(). So far we have ODP_SHM_SW_ONLY and ODP_SHM_PROC, we
would like to add something like ODP_SHM_NONCOHERENT or similar.
It would allow to keep the default as it is today (and we will support
it) but would allow for optimizations where it is performance sensitive.
We can discuss the issue during the call and post a patch quickly if
everybody agree.
By the way, what is the exact semantic of ODP_SHM_SW_ONLY and
ODP_SHM_PROC? From what I can see ODP_SHM_PROC relates to use
MAP_ANONYMOUS vs shm_open(), so mainly publishes the name of the mapping
(so other processes can use it) and I suspect that ODP_SHM_SW_ONLY
relates to things like DMA cache-coherency (well, lack of)?
ben
On 01/18/2016 10:38 AM, Christophe Milard wrote:
This seems to be a common opinion. I think it is nevertheless fair to
give a chance to Nicolas to explain his case.
On 18 January 2016 at 10:02, Ola Liljedahl <ola.liljed...@linaro.org
<mailto:ola.liljed...@linaro.org>> wrote:
On 15 January 2016 at 15:48, Christophe Milard
<christophe.mil...@linaro.org <mailto:christophe.mil...@linaro.org>>
wrote:
On Tuesday's ARCH call, we will be discussing the above topic.
Nicolas (Kalray) will try to join, but he is very uncertain at
this stage (if he can be there)...
Cache coherence is the norm today, non-coherent is an exception.
My opinion: If possible and simple, make public interfaces not
dependent on cache coherence. The reference implementation could
depend on cache coherence. Anyone who wants to support non-coherent
HW needs to provide the necessary support.
_______________________________________________
lng-odp mailing list
lng-odp@lists.linaro.org <mailto:lng-odp@lists.linaro.org>
https://lists.linaro.org/mailman/listinfo/lng-odp
_______________________________________________
lng-odp mailing list
lng-odp@lists.linaro.org
https://lists.linaro.org/mailman/listinfo/lng-odp
--
Benoît GANNE
Chief Architect, Kalray
+33 (0)648 125 843
_______________________________________________
lng-odp mailing list
lng-odp@lists.linaro.org
https://lists.linaro.org/mailman/listinfo/lng-odp
