On Thu, 8 Nov 2007, Peter Zijlstra wrote: > On Tue, 2007-11-06 at 11:51 -0800, Christoph Lameter wrote: > > > +/* > > + * Lock to protect the bitmap and the meta data for the cpu allocator. > > + */ > > +static DEFINE_SPINLOCK(cpu_alloc_map_lock); > > I thought you got nightmares from global locks :-)
Yes but this one is rarely taken. > Why a bitmap allocator and not a heap allocator? Because the allocator must be able to deal with small 4 byte entities. > Also, looking at the lock usage, this thing is not IRQ safe, so it > should not be called from hardirq context. Please document this. Ok. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
