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Re: Enable SMP support
From: |
Amos Jeffries |
Subject: |
Re: Enable SMP support |
Date: |
Fri, 15 Jun 2018 11:30:54 +1200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 |
On 15/06/18 10:31, Almudena Garcia wrote:
> Yes, I concluded the same a few hours ago. I tried to edit
> kern/cpu_number.h, to add a new definition with many cores, at this form
>
> int master_cpu; /* 'master' processor - keeps time */
>
> #if (NCPUS == 1)
> /* cpu number is always 0 on a single processor system */
> #define cpu_number() (0)
>
> #define CPU_L1_SIZE (1 << CPU_L1_SHIFT)
>
> #else
> #define cpu_number() (NCPUS)
>
I may be wrong, but that does not seem correct.
The man page for cpu_number() state it to be "an unique CPU
identification number for the CPU that this thread is running on". So it
clearly can change at runtime if there are 2+ CPUs on the machine.
Whereas NCPUS is being used by the precompiler as an integer with fixed
value that can be known at pre-compile time. Implied by the "#if NCPUS >
1" statement which this version of the code omits.
AYJ
- Enable SMP support, Almudena Garcia, 2018/06/07
- Re: Enable SMP support, Joshua Branson, 2018/06/08
- Re: Enable SMP support, James Clarke, 2018/06/08
- Re: Enable SMP support, Almudena Garcia, 2018/06/08
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support, Samuel Thibault, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support, Svante Signell, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support,
Amos Jeffries <=
- Re: Enable SMP support, liberamenso10000, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/14
- Re: Enable SMP support, Almudena Garcia, 2018/06/15
- Re: Enable SMP support, Richard Braun, 2018/06/15
- Re: Enable SMP support, Richard Braun, 2018/06/15
- Re: Enable SMP support, Almudena Garcia, 2018/06/15
- Re: Enable SMP support, Almudena Garcia, 2018/06/16
- Re: Enable SMP support, Almudena Garcia, 2018/06/16
- Re: Enable SMP support, Samuel Thibault, 2018/06/16
- Re: Enable SMP support, Almudena Garcia, 2018/06/16