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tcg: cpu-exec: remove tb_lock from the hot-path
Lock contention in the hot path of moving between existing patched TranslationBlocks is the main drag in multithreaded performance. This patch pushes the tb_lock() usage down to the two places that really need it: - code generation (tb_gen_code) - jump patching (tb_add_jump) The rest of the code doesn't really need to hold a lock as it is either using per-CPU structures, atomically updated or designed to be used in concurrent read situations (qht_lookup). To keep things simple I removed the #ifdef CONFIG_USER_ONLY stuff as the locks become NOPs anyway until the MTTCG work is completed. Signed-off-by: Alex Bennée <firstname.lastname@example.org> Reviewed-by: Richard Henderson <email@example.com> Reviewed-by: Sergey Fedorov <firstname.lastname@example.org> Signed-off-by: Sergey Fedorov <email@example.com> Message-Id: <firstname.lastname@example.org> Signed-off-by: Paolo Bonzini <email@example.com>
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