Andrew Morton wrote:
>Robert Love wrote:
>
>>...
>>
>>Question: if (from below) you are going to use atomic operations, why
>>make it per-CPU at all? Just have one counter and atomic_inc and
>>atomic_read it. You won't need a spin lock.
>>
>
>Oh that works fine. But then it's a global counter, so each time
>a CPU marks a page dirty, the counter needs to be pulled out of
>another CPU's cache. Which is not a thing I *need* to do.
>
>As I said, it's a micro-issue. But it's a requirement which
>may pop up elsewhere.
>
>
I can tell you that Irix has just such a global counter for the amount of
delayed allocate pages - and it gets to be a major point of cache contention
once you get to larger cpu counts. So avoiding that from the start would
be good.
Steve
-
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/
This archive was generated by hypermail 2b29 : Sat Feb 23 2002 - 21:00:51 EST