On Sun, Dec 30, 2018 at 12:49:34PM +0800, Yang Shi wrote: > The test on my virtual machine with congested HDD shows long tail > latency is reduced significantly. > > Without the patch > page_fault1_thr-1490 [023] 129.311706: funcgraph_entry: #57377.796 us | do_swap_page(); > page_fault1_thr-1490 [023] 129.369103: funcgraph_entry: 5.642us | do_swap_page(); > page_fault1_thr-1490 [023] 129.369119: funcgraph_entry: #1289.592 us | do_swap_page(); > page_fault1_thr-1490 [023] 129.370411: funcgraph_entry: 4.957us | do_swap_page(); > page_fault1_thr-1490 [023] 129.370419: funcgraph_entry: 1.940us | do_swap_page(); > page_fault1_thr-1490 [023] 129.378847: funcgraph_entry: #1411.385 us | do_swap_page(); > page_fault1_thr-1490 [023] 129.380262: funcgraph_entry: 3.916us | do_swap_page(); > page_fault1_thr-1490 [023] 129.380275: funcgraph_entry: #4287.751 us | do_swap_page(); > > With the patch > runtest.py-1417 [020] 301.925911: funcgraph_entry: #9870.146 us | do_swap_page(); > runtest.py-1417 [020] 301.935785: funcgraph_entry: 9.802us | do_swap_page(); > runtest.py-1417 [020] 301.935799: funcgraph_entry: 3.551us | do_swap_page(); > runtest.py-1417 [020] 301.935806: funcgraph_entry: 2.142us | do_swap_page(); > runtest.py-1417 [020] 301.935853: funcgraph_entry: 6.938us | do_swap_page(); > runtest.py-1417 [020] 301.935864: funcgraph_entry: 3.765us | do_swap_page(); > runtest.py-1417 [020] 301.935871: funcgraph_entry: 3.600us | do_swap_page(); > runtest.py-1417 [020] 301.935878: funcgraph_entry: 7.202us | do_swap_page(); Hi Yang, I guess runtest.py just calls page_fault1_thr? Being explicit about this may improve the changelog for those unfamiliar with will-it-scale. May also be useful to name will-it-scale and how it was run (#thr, runtime, system cpus/memory/swap) for more context.
