Re: [RFC 1/6] Framework

[Nick Piggin <nickpiggin@yahoo.com.au>]

Andi Kleen wrote:
> On Mon, Dec 12, 2005 at 02:46:42PM +1100, Nick Piggin wrote:
> 
>>Christoph Lameter wrote:
>>
>>
>>>+/*
>>>+ * For use when we know that interrupts are disabled.
>>>+ */
>>>+static inline void __mod_zone_page_state(struct zone *zone, enum 
>>>zone_stat_item item, int delta)
>>>+{
>>
>>Before this goes through, I have a full patch to do similar for the
>>rest of the statistics, and which will make names consistent with what
>>you have (shouldn't be a lot of clashes though).
> 
> 
> I also have a patch to change them all to local_t, greatly simplifying
> it (e.g. the counters can be done inline then) 
> 

Cool. That is a patch that should go on top of mine, because most of
my patch is aimed at moving modifications under interrupts-off sections,
so you would then be able to use __local_xxx operations very easily for
most of the counters here.

However I'm still worried about the use of locals tripling the cacheline
size of a hot-path structure on some 64-bit architectures. Probably we
should get them to try to move to the atomic64 scheme before using
local_t here.

Nick

-- 
SUSE Labs, Novell Inc.

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