Messages in this thread | | | Date | Mon, 20 Feb 2006 15:34:19 -0800 | From | Andrew Morton <> | Subject | Re: [patch] Cache align futex hash buckets |
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Andrew Morton <akpm@osdl.org> wrote: > > Ravikiran G Thirumalai <kiran@scalex86.org> 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 <kiran@scalex86.org> > > Signed-off-by: Shai Fultheim <shai@scalex86.org> > > > > 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? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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