Andrew Morton <[email protected]> wrote:
>
> Ravikiran G Thirumalai <[email protected]> wrote:
> >
> > Following change places each element of the futex_queues hashtable on a
> > different cacheline. Spinlocks of adjacent hash buckets lie on the same
> > cacheline otherwise.
> >
> > Signed-off-by: Ravikiran Thirumalai <[email protected]>
> > Signed-off-by: Shai Fultheim <[email protected]>
> >
> > Index: linux-2.6.16-rc2/kernel/futex.c
> > ===================================================================
> > --- linux-2.6.16-rc2.orig/kernel/futex.c 2006-02-07 23:14:04.000000000 -0800
> > +++ linux-2.6.16-rc2/kernel/futex.c 2006-02-09 14:04:22.000000000 -0800
> > @@ -100,9 +100,10 @@ struct futex_q {
> > struct futex_hash_bucket {
> > spinlock_t lock;
> > struct list_head chain;
> > -};
> > +} ____cacheline_internodealigned_in_smp;
> >
> > -static struct futex_hash_bucket futex_queues[1<<FUTEX_HASHBITS];
> > +static struct futex_hash_bucket futex_queues[1<<FUTEX_HASHBITS]
> > + __cacheline_aligned_in_smp;
> >
>
> How much memory does that thing end up consuming?
I think a megabyte?
-
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