diff options
author | Alex Bennée <alex.bennee@linaro.org> | 2016-07-15 20:58:49 +0300 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-13 19:08:43 +0200 |
commit | 518615c6503ad78d3bb67ddf1cd848c4a41de02e (patch) | |
tree | 04a4b5226ae02df33058e6c8012be8949ef11b42 /target-cris | |
parent | 2e1ae44a4f4a6149fbb9dc812243522f07284700 (diff) |
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 <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Message-Id: <20160715175852.30749-10-sergey.fedorov@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target-cris')
0 files changed, 0 insertions, 0 deletions