On 03/12/2015 12:03 PM, Savolainen, Petri (Nokia - FI/Espoo) wrote:
-----Original Message-----
From: ext Taras Kondratiuk [mailto:taras.kondrat...@linaro.org]
Sent: Wednesday, March 11, 2015 5:18 PM
To: Savolainen, Petri (Nokia - FI/Espoo); ext Christophe Milard; lng-
o...@lists.linaro.org
Subject: Re: [lng-odp] odp_cpu_count() vs odp_cpumask size
On 03/11/2015 04:46 PM, Savolainen, Petri (Nokia - FI/Espoo) wrote:
Continuation of cpumask discussion on the call... For creating arbitrary
masks (e.g. fill in a mask with CPU ids of another ODP program in the
system, or testing all possible mask bits), we may need two more calls:
/**
* @return Maximum number of CPUs a mask can hold
*/
int odp_cpumask_max_cpus(void)
/**
* Set all CPUs in the mask
*
* After the call, the mask has odp_cpumask_max_cpus() CPUs set.
* @note CPU numbering may not be contiguous.
*/
void odp_cpumask_setall(odp_cpumask_t *mask)
-Petri
*From:*lng-odp-boun...@lists.linaro.org
[mailto:lng-odp-boun...@lists.linaro.org] *On Behalf Of *ext Savolainen,
Petri (Nokia - FI/Espoo)
*Sent:* Wednesday, March 11, 2015 2:09 PM
*To:* ext Christophe Milard; lng-odp@lists.linaro.org
*Subject:* Re: [lng-odp] odp_cpu_count() vs odp_cpumask size
Actually, this is equal to odp_cpu_max():
odp_cpumask_t mask;
odp_cpu_mask(&mask)
odp_cpumask_last(&mask)
So maybe odp_cpu_mask() is only new thing we need.
Hi Petri
It is not clear to me why do we need odp_cpu_* and odp_cpumask_* API.
They are used now to create threads and set CPU affinity. But this is
done by ODP helpers, because it is out of ODP scope. Shouldn't 'cpu' and
'cpumask' be a part of helpers too?
The original idea was to use cpumask in definition of odp_schedule_group_t
(still on todo list). I need go through that use case and see if e.g. a thread
mask would work instead.
Currently cpumask is used for 'real' CPUs, but IMO scheduler group
should operate on thread IDs instead.
E.g. odp_cpu_id() is good for debugging (e.g. that thread pinning is working).
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