RE: __alloc_pages ()

From: Parveen Verma, Noida
Date: Tue Jun 21 2005 - 00:38:17 EST

mån 2005-06-20 klockan 17:23 +0530 skrev Parveen Verma, Noida:
> Hi,
> I have found that while allocating (mostly it is done) the pages in
> __alloc_pages(), after successfully allocating the page the
> zone_statistics() function is called.
> static void zone_statistics(struct zonelist *zonelist, struct zone *z)
> { #ifdef CONFIG_NUMA .....
> #endif
> }
> The whole body of this function is enclosed b/w #ifdef ... #endif.
> This function is called each time and does nothing if we don't have a
> NUMA machine.
> Can we put the call for this b/w #ifdef ... #endif?
> Although the gcc -O3 option does not generate a function call if the
> function body is nil.

I'd say gcc should optimize this out as is already, but now that it doesn't,
if you just make zone_statistics() inline the call will go away with -O2

I checked with gcc 4.0.0 in FC4, the gcc optimizes it without making inline
and with -O1 option too.

Now the main point is how can we incorporate this change in main Linux

Praveen Verma
(Hare Rama Hare Krishna)
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