Log slow IO operations

[eddyashton]

First pass just logs the most expensive call to read_entry. Will generalise this to wrap all IO operations, and report if they take over some threshold.

[ghost]

ledger_logging@34181 aka 20211008.22 vs main ewma over 20 builds from 33719 to 34113

Click to see table

build_id	build_number	tpcc_sgx_cft^	tpcc_sgx_cft_mem	tpcc_sgx_bft^	tpcc_sgx_bft_mem	ls_sgx_cft^	ls_sgx_cft_mem	ls_jwt_sgx_cft^	ls_jwt_sgx_cft_mem	ls_js_sgx_cft^	ls_js_sgx_cft_mem	ls_full_js_sgx_cft^	ls_full_js_sgx_cft_mem	ls_js_jwt_sgx_cft^	ls_js_jwt_sgx_cft_mem	CHAMP put (/s)^	CHAMP get (/s)^	Historical query (/s)^
33719	20211004.15	6878.85	9.10992e+07	1801.04	1.63975e+08	24438.7	1.82232e+07	4331.17	1.58639e+07	2751.85	1.03588e+07	2602.68	1.08831e+07	1796.84	8.2617e+06	1.49227e+06	3.58042e+07	nan
33724	20211004.17	6564.67	9.18856e+07	1874.15	1.76296e+08	24825.3	1.7961e+07	4408.15	1.63882e+07	2753.4	1.50774e+07	2613.04	1.4291e+07	1841.12	8.2617e+06	1.38508e+06	3.63114e+07	nan
33726	20211004.18	6620.37	9.21478e+07	2040.8	1.52179e+08	24168.6	1.84853e+07	4420.32	1.56017e+07	2796.07	1.00967e+07	2601.17	1.45532e+07	1831.48	8.2617e+06	1.4642e+06	3.66362e+07	nan
33733	20211005.1	6372.55	9.08371e+07	2055.06	1.46936e+08	24055.4	1.7961e+07	4386.69	1.58639e+07	2793.32	1.48153e+07	2635.9	1.48153e+07	1833.13	8.2617e+06	1.45155e+06	3.64406e+07	nan
33801	20211005.20	6757.24	9.16235e+07	2056.16	1.84947e+08	23586.7	1.82232e+07	4379.64	1.56017e+07	2744.98	1.45532e+07	2647.81	1.53396e+07	1824.47	8.52384e+06	1.45548e+06	3.58669e+07	7723.88
33828	20211005.28	6616.47	9.21478e+07	2134.71	1.48771e+08	24685	1.84853e+07	4397.62	1.56017e+07	2747.05	1.45532e+07	2655.43	1.48153e+07	1838.74	1.03588e+07	1.48104e+06	3.65708e+07	8419.74
33846	20211005.33	6764.41	9.21478e+07	2057.61	1.49557e+08	24652.1	1.92717e+07	4682.93	1.58639e+07	2774.57	1.03588e+07	2635.92	1.00967e+07	1823.89	8.2617e+06	1.4683e+06	3.58036e+07	8483.54
33853	20211006.1	6724.34	9.13613e+07	1971.22	1.52179e+08	23813.9	1.84853e+07	4564.88	1.56017e+07	2774.71	1.50774e+07	2620.99	1.08831e+07	1815.45	8.52384e+06	1.45465e+06	3.58669e+07	8567.16
33868	20211006.6	6324.38	9.16235e+07	2018.73	1.5113e+08	24389.9	1.84853e+07	4590.95	1.56017e+07	2703.88	1.27181e+07	2630.89	1.53396e+07	1827.27	1.03588e+07	1.44888e+06	3.59298e+07	7730.87
33876	20211006.7	6503.48	9.18856e+07	2035.66	1.50082e+08	24348.1	1.84853e+07	4587.58	1.56017e+07	2801.24	1.03588e+07	2675.02	1.08831e+07	1845.32	8.2617e+06	1.45671e+06	3.51884e+07	8612.83
33878	20211006.8	6627.39	9.16235e+07	2143.78	1.61878e+08	24714.3	1.9796e+07	4542.04	1.58639e+07	2713.41	1.45532e+07	2640.49	1.08831e+07	1844.03	7.73741e+06	1.45237e+06	3.58669e+07	8702.62
33879	20211006.9	6770.99	9.18856e+07	1951.38	1.75772e+08	24731.7	1.76989e+07	4509.17	1.56017e+07	2744.7	1.48153e+07	2639.81	1.08831e+07	1834.94	8.2617e+06	1.47539e+06	3.59298e+07	8364.45
33924	20211006.22	6581.35	9.13613e+07	2137.19	1.45101e+08	23779.3	1.76989e+07	4593.54	1.58639e+07	2780.11	1.00967e+07	2659.76	1.35046e+07	1814.67	8.52384e+06	1.4773e+06	3.58669e+07	7904.07
33982	20211006.37	6645.5	9.18856e+07	2208.54	1.4012e+08	24610	1.87475e+07	4490.68	1.56017e+07	2777.93	1.03588e+07	2648.8	1.50774e+07	1831.75	7.99955e+06	1.48642e+06	3.63766e+07	8529.81
34014	20211006.45	6634.3	9.05749e+07	1833.44	1.96481e+08	24411.3	1.7961e+07	4551.4	1.56017e+07	2759.75	1.40289e+07	2666.57	1.0621e+07	1838.85	7.99955e+06	1.45227e+06	3.58669e+07	8343.98
34025	20211006.48	6739.41	9.31964e+07	2299.34	1.39596e+08	24814.4	1.87475e+07	4545.41	1.53396e+07	2711.64	1.27181e+07	2623.08	1.45532e+07	1839.55	8.2617e+06	1.46191e+06	3.59298e+07	8464.13
34040	20211007.1	6812.71	9.26721e+07	2029.28	1.53227e+08	24726.8	1.84853e+07	4515.6	1.63882e+07	2802.03	1.40289e+07	2587.59	1.03588e+07	1836.15	8.2617e+06	1.45952e+06	3.47708e+07	8512.75
34063	20211007.7	6507.04	9.16235e+07	2107.08	1.47722e+08	24405.6	1.84853e+07	4546.7	1.56017e+07	2739.58	1.03588e+07	2668.88	1.32424e+07	1835.97	8.2617e+06	1.45072e+06	3.56174e+07	8201.98
34106	20211008.2	6613.84	9.21478e+07	2213.34	1.38023e+08	23277.2	1.84853e+07	4576.12	1.58639e+07	2758.08	1.27181e+07	2682.67	1.53396e+07	1833.06	8.2617e+06	1.4453e+06	3.58042e+07	8338.91
34113	20211008.3	6696.89	9.08371e+07	2110.65	1.52703e+08	24682.6	1.87475e+07	4401.81	1.53396e+07	2781.38	1.29803e+07	2699.15	1.32424e+07	1807.96	8.52384e+06	1.4562e+06	3.59298e+07	8694.73