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That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robert.foley@linaro.org, cota@braap.org, Paolo Bonzini , peter.puhov@linaro.org, alex.bennee@linaro.org, Richard Henderson Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: "Emilio G. Cota" This yields sizable scalability improvements, as the below results show. Host: Two Intel Xeon Silver 4114 20-core CPUs at 2.20 GHz VM: Ubuntu 18.04 ppc64 Speedup vs a single thread for kernel build                                                                                                     7 +-----------------------------------------------------------------------+       |         +          +         +         +         +          +         |       |                                    ###########       baseline ******* |       |                               #####           ####   cpu lock ####### |       |                             ##                    ####                |     6 |-+                         ##                          ##            +-|       |                         ##                              ####          |       |                       ##                                    ###       |       |                     ##        *****                            #      |       |                   ##      ****     ***                          #     |       |                 ##     ***            *                               |     5 |-+             ##    ***                ****                         +-|       |              #  ****                       **                         |       |             # **                             **                       |       |             #*                                 **                     |       |          #*                                          **               |       |         #*                                             *              |       |         #                                               ******        |       |        #                                                      **      |       |       #                                                         *     |     3 |-+     #                                                             +-|       |      #                                                                |       |      #                                                                |       |     #                                                                 |       |     #                                                                 |     2 |-+  #                                                                +-|       |    #                                                                  |       |   #                                                                   |       |   #                                                                   |       |  #                                                                    |       |  #      +          +         +         +         +          +         |     1 +-----------------------------------------------------------------------+       0         5          10        15        20        25         30        35                                      Guest vCPUs   Pictures are also here: https://drive.google.com/file/d/1ASg5XyP9hNfN9VysXC3qe5s9QSJlwFAt/view?usp=sharing Some notes: - baseline corresponds to the commit before this series - cpu-lock is this series Single-threaded performance is affected very lightly. Results below for debian aarch64 bootup+test for the entire series on an Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz host: - Before: Performance counter stats for 'taskset -c 0 ../img/aarch64/die.sh' (10 runs): 7269.033478 task-clock (msec) # 0.998 CPUs utilized ( +- 0.06% ) 30,659,870,302 cycles # 4.218 GHz ( +- 0.06% ) 54,790,540,051 instructions # 1.79 insns per cycle ( +- 0.05% ) 9,796,441,380 branches # 1347.695 M/sec ( +- 0.05% ) 165,132,201 branch-misses # 1.69% of all branches ( +- 0.12% ) 7.287011656 seconds time elapsed ( +- 0.10% ) - After: 7375.924053 task-clock (msec) # 0.998 CPUs utilized ( +- 0.13% ) 31,107,548,846 cycles # 4.217 GHz ( +- 0.12% ) 55,355,668,947 instructions # 1.78 insns per cycle ( +- 0.05% ) 9,929,917,664 branches # 1346.261 M/sec ( +- 0.04% ) 166,547,442 branch-misses # 1.68% of all branches ( +- 0.09% ) 7.389068145 seconds time elapsed ( +- 0.13% ) That is, a 1.37% slowdown. Reviewed-by: Alex Bennée Reviewed-by: Richard Henderson Tested-by: Alex Bennée Signed-off-by: Emilio G. Cota [Updated the speedup chart results for re-based series.] Signed-off-by: Robert Foley --- accel/tcg/cputlb.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) -- 2.17.1 diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c index 1e815357c7..7f75054643 100644 --- a/accel/tcg/cputlb.c +++ b/accel/tcg/cputlb.c @@ -299,7 +299,7 @@ static void flush_all_helper(CPUState *src, run_on_cpu_func fn, CPU_FOREACH(cpu) { if (cpu != src) { - async_run_on_cpu(cpu, fn, d); + async_run_on_cpu_no_bql(cpu, fn, d); } } } @@ -367,8 +367,8 @@ void tlb_flush_by_mmuidx(CPUState *cpu, uint16_t idxmap) tlb_debug("mmu_idx: 0x%" PRIx16 "\n", idxmap); if (cpu->created && !qemu_cpu_is_self(cpu)) { - async_run_on_cpu(cpu, tlb_flush_by_mmuidx_async_work, - RUN_ON_CPU_HOST_INT(idxmap)); + async_run_on_cpu_no_bql(cpu, tlb_flush_by_mmuidx_async_work, + RUN_ON_CPU_HOST_INT(idxmap)); } else { tlb_flush_by_mmuidx_async_work(cpu, RUN_ON_CPU_HOST_INT(idxmap)); } @@ -562,7 +562,7 @@ void tlb_flush_page_by_mmuidx(CPUState *cpu, target_ulong addr, uint16_t idxmap) * we can stuff idxmap into the low TARGET_PAGE_BITS, avoid * allocating memory for this operation. */ - async_run_on_cpu(cpu, tlb_flush_page_by_mmuidx_async_1, + async_run_on_cpu_no_bql(cpu, tlb_flush_page_by_mmuidx_async_1, RUN_ON_CPU_TARGET_PTR(addr | idxmap)); } else { TLBFlushPageByMMUIdxData *d = g_new(TLBFlushPageByMMUIdxData, 1); @@ -570,7 +570,7 @@ void tlb_flush_page_by_mmuidx(CPUState *cpu, target_ulong addr, uint16_t idxmap) /* Otherwise allocate a structure, freed by the worker. */ d->addr = addr; d->idxmap = idxmap; - async_run_on_cpu(cpu, tlb_flush_page_by_mmuidx_async_2, + async_run_on_cpu_no_bql(cpu, tlb_flush_page_by_mmuidx_async_2, RUN_ON_CPU_HOST_PTR(d)); } }