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[SPARC64]: Optimized TSB table initialization.

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We only need to write an invalid tag every 16 bytes,
so taking advantage of this can save many instructions
compared to the simple memset() call we make now.

A prefetching implementation is implemented for sun4u
and a block-init store version if implemented for Niagara.

The next trick is to be able to perform an init and
a copy_tsb() in parallel when growing a TSB table.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-03-18 23:55:11 -08:00
parent 88d7079458
commit bb8646d834
4 changed files with 72 additions and 1 deletions
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2
arch/sparc64/mm/tsb.c
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@@ -313,7 +313,7 @@ retry_tsb_alloc:
}
/* Mark all tags as invalid. */
memset(new_tsb, 0x40, new_size);
tsb_init(new_tsb, new_size);
/* Ok, we are about to commit the changes. If we are
* growing an existing TSB the locking is very tricky,