On Saturday 03 August 2002 23:40, Andrew Morton wrote:
> - total amount of CPU time lost spinning on locks is 1%, mainly
> in page_add_rmap and zap_pte_range.
>
> That's not much spintime. The total system time with this test went
> from 71 seconds (2.5.26) to 88 seconds (2.5.30). (4.5 seconds per CPU)
> So all the time is presumably spent waiting on cachelines to come from
> other CPUs, or from local L2.
Have we tried this one:
static inline unsigned rmap_lockno(pgoff_t index)
{
- return (index >> 4) & (ARRAY_SIZE(rmap_locks) - 1);
+ return (index >> 4) & (ARRAY_SIZE(rmap_locks) - 16);
}
(which puts all the rmap spinlocks in separate cache lines)
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This archive was generated by hypermail 2b29 : Wed Aug 07 2002 - 22:00:23 EST