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authorEmilio G. Cota <cota@braap.org>2017-08-01 15:40:16 -0400
committerRichard Henderson <richard.henderson@linaro.org>2018-06-15 08:18:42 -1000
commit95590e24af11236ef334f6bc3e2b71404a790ddb (patch)
tree76e03c0f097bd05f4921fdc6cbe067cc9e2e598e /docs/devel
parentfaa9372c07d062eb01f9da72e3f6c0f32efffca7 (diff)
translate-all: discard TB when tb_link_page returns an existing matching TB
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>
Diffstat (limited to 'docs/devel')
-rw-r--r--docs/devel/multi-thread-tcg.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/devel/multi-thread-tcg.txt b/docs/devel/multi-thread-tcg.txt
index faf8918b23..faf09c6069 100644
--- a/docs/devel/multi-thread-tcg.txt
+++ b/docs/devel/multi-thread-tcg.txt
@@ -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
--------------------