Re: /proc/sys/kernel/pid_max issues

From: Ingo Molnar (mingo_at_elte.hu)
Date: 09/12/04

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    Date:	Sun, 12 Sep 2004 15:41:37 +0200
To: Arjan van de Ven <arjanv@redhat.com>

    * Arjan van de Ven <arjanv@redhat.com> wrote:

    > On Sun, Sep 12, 2004 at 10:30:00PM +1000, Anton Blanchard wrote:
    > >
    > > Hmm can you point the 16bit counter out? I can create 1 million NPTL
    > > threads on ppc64 easily, so why not?
    >
    > /*
    > * the semaphore definition
    > */
    > struct rw_semaphore {
    > /* XXX this should be able to be an atomic_t -- paulus */
    > signed int count;
    > #define RWSEM_UNLOCKED_VALUE 0x00000000
    > #define RWSEM_ACTIVE_BIAS 0x00000001
    > #define RWSEM_ACTIVE_MASK 0x0000ffff
    >
    > that counter is split in 2 16 bit entities....

    the generic semaphore code can handle up to ~2^31 waiters. I once tried
    it on x86, it seems to work fine.

            Ingo
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