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translate-all: discard TB when tb_link_page returns an existing matching TB

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Use the recently-gained QHT feature of returning the matching TB if it
already exists. This allows us to get rid of the lookup we perform
right after acquiring tb_lock.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2017-08-01 15:40:16 -04:00 • committed by Richard Henderson
parent faa9372c07
commit 95590e24af
3 changed files with 46 additions and 21 deletions
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3
docs/devel/multi-thread-tcg.txt
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@ -140,6 +140,9 @@ to atomically insert new elements.
The lookup caches are updated atomically and the lookup hash uses QHT
which is designed for concurrent safe lookup.
Parallel code generation is supported. QHT is used at insertion time
as the synchronization point across threads, thereby ensuring that we only
keep track of a single TranslationBlock for each guest code block.
Memory maps and TLBs
--------------------