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Date: Mon, 3 Mar 2008 02:23:49 -1000 (HST)
From: Jeff Roberson <jroberson@chesapeake.net>
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To: Roman Divacky <rdivacky@freebsd.org>
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Cc: emulation@freebsd.org, jeff@freebsd.org
Subject: Re: [PATCH] linux get affinity syscall
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On Sun, 2 Mar 2008, Roman Divacky wrote:

> hi..
>
> jeff commited his cpu set and I tried to map that to linuxulator
> version of linux_sched_getaffinity(), the current (untested) code
> looks like this:
>
> /*
> * Get affinity of a process
> */
> int
> linux_sched_getaffinity(struct thread *td,
>    struct linux_sched_getaffinity_args *args)
> {
>        int error;
>        struct cpuset_getaffinity_args cga;
>
>        if (args->len < sizeof(cpumask_t))
>                return (EINVAL);

Len here is in number of bits I believe as it is for our cpusetsize.

>
>        cga.level = CPU_LEVEL_WHICH;
>        cga.which = CPU_WHICH_PID;
>        cga.id = args->pid;
>        cga.cpusetsize = sizeof(cpumask_t) * NBBY;
>        cga.mask = (long *) args->user_mask_ptr;

Our call will accept larger values and zero fill any bits we don't use. 
It should be safe to pass the original len.

>
>        if ((error = cpuset_getaffinity(td, &cga)) == 0)
>                td->td_retval[0] = sizeof(cpumask_t);
>
>        return (error);
> }

Thanks,
Jeff

>
>
> can someone comment on this? thnx
>
> roman
>