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SubjectRe: [patch 3/6] mempolicy: add MPOL_F_STATIC_NODES flag
On Mon, 25 Feb 2008, Paul Jackson wrote:

> $ grep mpol_store_user_nodemask mm/mempolicy.c
> static inline int mpol_store_user_nodemask(const struct mempolicy *pol)
> if (mpol_store_user_nodemask(policy))
> if (!mpol_store_user_nodemask(a))
> if (!mpol_store_user_nodemask(pol) &&
> So I see no need to waste the instructions needed (in the three copies
> of this code, since it's static inline) to convert a non-zero value to
> exactly the value 1.

Done, thanks.

> Hmmm ... speaking of static inline ... I can knock 600 bytes (that's
> IA64 bytes, so equivalent to about 300 x86 bytes) off the kernel text
> size by not inlining the mm/mempolicy.c routines check_pgd_range() and
> interleave_nid(). I wonder if that would be worth doing. Perhaps
> those two routines are in sufficiently tight corners that the duplicate
> copies of them is needed.

It seems like a worthwhile change to me even though gcc will pass the
actuals to check_pgd_range() on the stack. The callers to check_range()
shouldn't be in any fast paths: migrate_to_node() can take a long time
depending on the length of the page list and do_mbind() sleeps on

text data bss dec hex filename
11695 24 24 11743 2ddf mm/mempolicy.o.before
11215 24 24 11263 2bff mm/mempolicy.o.after

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