From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxx> Changelog in v3: Thanks to Emilio's comments and his example code, the changes in this version are: 1. move @requests from the shared data struct to each single thread 2. move completion ev from the shared data struct to each single thread 3. move bitmaps from the shared data struct to each single thread 4. limit the number of request that each thread need handle to 64, then use uint64_t instead of bitmap pointer. The performance is measured by using the benchmark we introduced in this pachset: ./tests/threaded-workqueue-bench -c 20 -m 16 -t N the data is as followings: The baseline of v2: Thread #, Throughput 1, 0.428024 4, 1.668876 8, 3.501940 12, 5.026403 16, 1.912374 20, 1.174771 24, 1.074085 28, 0.747920 32, 0.651409 36, 0.533240 40, 0.517421 44, 0.482153 48, 0.525176 52, 0.492677 56, 0.798679 60, 0.733868 64, 0.751396 After this patchset: Thread #, Throughput 1, 0.449192 4, 1.849271 8, 3.644339 12, 4.809391 16, 4.709095 20, 4.942153 24, 5.116967 28, 4.921542 32, 5.008816 36, 5.408070 40, 5.166064 44, 4.994953 48, 4.853351 52, 4.797540 56, 4.815153 60, 4.793704 64, 4.913544 To see more detailed compression by each step, please refer to https://ibb.co/hq7u5V Xiao Guangrong (5): bitops: introduce change_bit_atomic util: introduce threaded workqueue migration: use threaded workqueue for compression migration: use threaded workqueue for decompression tests: add threaded-workqueue-bench include/qemu/bitops.h | 13 + include/qemu/threaded-workqueue.h | 106 ++++++++ migration/ram.c | 530 ++++++++++++++------------------------ tests/Makefile.include | 5 +- tests/threaded-workqueue-bench.c | 255 ++++++++++++++++++ util/Makefile.objs | 1 + util/threaded-workqueue.c | 463 +++++++++++++++++++++++++++++++++ 7 files changed, 1029 insertions(+), 344 deletions(-) create mode 100644 include/qemu/threaded-workqueue.h create mode 100644 tests/threaded-workqueue-bench.c create mode 100644 util/threaded-workqueue.c -- 2.14.5
