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Message-ID: <20090927104739.GA1666@localhost>
Date: Sun, 27 Sep 2009 18:47:39 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: Andi Kleen <andi@...stfloor.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Hugh Dickins <hugh.dickins@...cali.co.uk>,
Nick Piggin <npiggin@...e.de>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] HWPOISON: remove the unsafe __set_page_locked()
On Sat, Sep 26, 2009 at 07:31:56PM +0800, Wu Fengguang wrote:
> On Sat, Sep 26, 2009 at 06:52:59PM +0800, Wu Fengguang wrote:
> > On Sat, Sep 26, 2009 at 11:49:36AM +0800, Andi Kleen wrote:
> > > On Sat, Sep 26, 2009 at 11:15:37AM +0800, Wu Fengguang wrote:
> > > > The swap cache and page cache code assume that they 'own' the newly
> > > > allocated page and therefore can disregard the locking rules. However
> > > > now hwpoison can hit any time on any page.
> > > >
> > > > So use the safer lock_page()/trylock_page(). The main intention is not
> > > > to close such a small time window of memory corruption. But to avoid
> > > > kernel oops that may result from such races, and also avoid raising
> > > > false alerts in hwpoison stress tests.
> > > >
> > > > This in theory will slightly increase page cache/swap cache overheads,
> > > > however it seems to be too small to be measurable in benchmark.
> > >
> > > Thanks. Can you please describe what benchmarks you used?
> >
> > Good question. The test case is to copy 1GB sparse file over NFS.
> >
> > I ran it 100 times (2 hours total wall time) and the overheads are ~0.008%.
>
> And standard deviation is 0.04%, much larger than the difference 0.008% ..
Sorry that's not correct. I improved the accounting by treating
function0+function1 from two CPUs as an integral entity:
total time add_to_page_cache_lru percent stddev
before 3880166848.722 9683329.610 0.250% 0.014%
after 3828516894.376 9778088.870 0.256% 0.012%
delta 0.006%
Thanks,
Fengguang
> > The average time reported by the function profiler:
> >
> > total time add_to_page_cache_lru percent
> > before 1940083424.361 4841664.805 0.242%
> > after 1914258447.188 4889044.435 0.250%
> >
> > The script used is:
> >
> > for i in `seq 1 100`
> > do
> > # copy 1GB sparse file over NFS
> > echo 1 > /debug/tracing/function_profile_enabled
> > cp /tmp/sparse/1G /dev/null
> > echo 0 > /debug/tracing/function_profile_enabled
> >
> > fadvise /tmp/sparse/1G 0 0 dontneed
> > cat /debug/tracing/trace_stat/function0 > function0.$i
> > cat /debug/tracing/trace_stat/function1 > function1.$i
> > done
> >
> >
> > File function0.1 after patch:
> >
> > Function Hit Time Avg
> > -------- --- ---- ---
> > schedule 32492 474358128 us 14599.22 us
> > schedule_timeout 26 99994288 us 3845934 us
> > poll_schedule_timeout 8 52914376 us 6614297 us
> > sys_poll 6 52914373 us 8819062 us
> > schedule_hrtimeout_range 8 52914373 us 6614296 us
> > do_sys_poll 6 52914355 us 8819059 us
> > sys_read 86997 40703194 us 467.868 us
> > vfs_read 87002 40550651 us 466.088 us
> > do_sync_read 86987 40011054 us 459.965 us
> > nfs_file_read 86985 39945631 us 459.224 us
> > generic_file_aio_read 86985 39785858 us 457.387 us
> > page_cache_async_readahead 2886 34379069 us 11912.35 us
> > ondemand_readahead 2889 34371850 us 11897.49 us
> > ra_submit 2891 34368378 us 11888.05 us
> > __do_page_cache_readahead 2891 34360744 us 11885.41 us
> > nfs_readpages 2876 33198107 us 11543.15 us
> > read_cache_pages 2876 31617284 us 10993.49 us
> > __rpc_execute 84468 25404441 us 300.758 us
> > readpage_async_filler 174071 24947004 us 143.315 us
> > do_softirq 44822 24829675 us 553.961 us
> > __do_softirq 44822 24803408 us 553.375 us
> > net_rx_action 38424 24357207 us 633.906 us
> > e1000_clean 39042 24253141 us 621.206 us
> > nfs_pageio_doio 43534 22993433 us 528.171 us
> > nfs_pagein_one 43520 22939752 us 527.108 us
> > nfs_read_rpcsetup 43513 22533176 us 517.849 us
> > e1000_clean_rx_irq 39042 22047306 us 564.707 us
> > rpc_run_task 43528 22042766 us 506.404 us
> > call_transmit 45873 21842655 us 476.154 us
> > nfs_pageio_add_request 174091 21583666 us 123.979 us
> > rpc_execute 43528 21254402 us 488.292 us
> > cpuidle_idle_call 18073 19445493 us 1075.941 us
> > acpi_idle_enter_c1 17999 19396945 us 1077.667 us
> > e1000_receive_skb 436279 18818686 us 43.134 us
> > tcp_v4_do_rcv 513521 18681598 us 36.379 us
> > xprt_transmit 43346 18532249 us 427.542 us
> > tcp_rcv_established 513521 18384627 us 35.801 us
> > napi_gro_receive 436279 18114586 us 41.520 us
> > napi_skb_finish 436279 17130261 us 39.264 us
> > netif_receive_skb 436279 16886046 us 38.704 us
> > ip_rcv 436279 16500338 us 37.820 us
> > xs_tcp_send_request 43346 16418581 us 378.779 us
> > xs_sendpages 43346 16367619 us 377.603 us
> > xs_send_kvec 43347 16310325 us 376.273 us
> > kernel_sendmsg 43347 16254698 us 374.990 us
> > sock_sendmsg 43347 16177184 us 373.201 us
> > tcp_sendmsg 43347 16127746 us 372.061 us
> > do_IRQ 45271 15968995 us 352.742 us
> > ip_local_deliver 436279 15816133 us 36.252 us
> > irq_exit 53709 15421475 us 287.130 us
> > acpi_processor_ffh_cstate_ente 17999 15394735 us 855.310 us
> > mwait_idle_with_hints 17999 15386089 us 854.830 us
> > tcp_v4_rcv 436217 15173852 us 34.785 us
> > release_sock 43364 13536313 us 312.155 us
> > xs_tcp_data_ready 512045 10092920 us 19.711 us
> > _spin_unlock_bh 518900 9851221 us 18.984 us
> > local_bh_enable_ip 511352 9403704 us 18.389 us
> > tcp_read_sock 1024090 8832051 us 8.624 us
> > __tcp_ack_snd_check 512045 6644838 us 12.977 us
> > add_to_page_cache_lru 174072 6287717 us 36.121 us
> > tcp_transmit_skb 296572 5962431 us 20.104 us
> > tcp_send_ack 253210 5775135 us 22.807 us
> > __kfree_skb 802932 5216451 us 6.496 us
> > add_to_page_cache_locked 174072 4716425 us 27.094 us
> > [...]
> >
> > Detailed time before patch (100 runs * 2 CPU):
> >
> > Total add_to_page_cache_lru percent
> > 1927694859.404 6703561 0.34775011030908648%
> > 1994166534.446 7311783 0.36665859514242066%
> > 2132812997.930 6249683 0.29302536162643533%
> > 1972582396.980 7908593 0.40092586307715006%
> > 2415371209.622 7670327 0.31756307144194151%
> > 2163473353.153 7406991 0.34236571433640306%
> > 1833544521.635 7952113 0.43370165851816772%
> > 2087748556.683 7995535 0.38297404035585819%
> > 2185868844.795 7117368 0.32560819085499598%
> > 1980423680.193 6514699 0.32895481230385598%
> > 1958021484.352 6745228 0.34449203207963308%
> > 2008592063.702 7398967 0.36836583862444905%
> > 2448117568.931 6224454 0.25425470079519025%
> > 2213021186.789 6938228 0.31351837214297412%
> > 1828902235.789 7479842 0.40897987074596959%
> > 1866644864.837 7720792 0.41361868802366963%
> > 2054526163.572 8475856 0.41254553727677401%
> > 1902862587.026 8334661 0.43800645705196778%
> > 2148449373.925 8672498 0.40366313050031155%
> > 2104880443.231 7741619 0.36779376353160392%
> > 2270646549.540 6486688 0.2856758134071597%
> > 2250814274.826 7512331 0.33376058984612328%
> > 2214008898.106 6391259 0.28867359139646992%
> > 2446226035.589 7738434 0.31634173978271579%
> > 1920377000.358 6464992 0.33665223020244384%
> > 2030446733.714 6022617 0.2966153654759367%
> > 2157128575.464 7375670 0.34192074055731642%
> > 2185670134.683 7943199 0.36342167438509865%
> > 2224381465.969 8492920 0.38181041021667828%
> > 2479045291.455 8161934 0.32923698603382928%
> > 1971641972.432 8114434 0.41155717485517562%
> > 2208169216.013 8138519 0.36856410011433138%
> > 1971312194.985 8122576 0.41203904793283169%
> > 2279129743.345 7365286 0.3231622079219687%
> > 2360162707.877 7412468 0.3140659741491984%
> > 1885022652.013 8252339 0.43778460652382062%
> > 2065345722.062 7985361 0.3866355600759942%
> > 1975982196.916 7925371 0.4010851419799969%
> > 2169738273.075 7203856 0.33201497569522709%
> > 2034570957.887 7396992 0.36356520136717829%
> > 1789538123.758 7380292 0.41241323121418116%
> > 1912812047.546 8697404 0.45469203370807615%
> > 2221047646.893 7451321 0.33548676951723994%
> > 2163981380.559 7982481 0.36887937538251664%
> > 1969189605.396 7353112 0.37340802428831149%
> > 2278909389.270 7088803 0.31106120468750831%
> > 2104996788.904 7342692 0.34882200479854836%
> > 2374705789.293 7327329 0.30855733931492624%
> > 2137944282.456 8112283 0.3794431438915179%
> > 2268117031.230 6889022 0.30373309247909852%
> > 1899091967.945 8173918 0.43041190937398177%
> > 2098779842.987 7858621 0.37443760603377763%
> > 2124662819.215 8156209 0.38388251190904155%
> > 2317714239.959 7048899 0.30413149638864423%
> > 2218944220.453 6659501 0.30012025262358577%
> > 1945126557.801 7704643 0.3960998305791596%
> > 2092060468.851 7616315 0.36405807161888715%
> > 1933379809.531 7300893 0.37762331870896354%
> > 1903832170.769 7508856 0.39440745435912067%
> > 2435478683.656 6790800 0.27882814354203433%
> > 2126189870.763 7104836 0.33415811530747125%
> > 2161363441.772 7011298 0.32439236569356278%
> > 2064449342.765 6822211 0.33046153561039859%
> > 2116816508.947 8156178 0.38530396779913867%
> > 1982774633.856 7131335 0.35966442571092105%
> > 2323253766.182 7275361 0.3131539526978242%
> > 1905927501.820 7477458 0.39232646534874271%
> > 2252162684.001 8064426 0.35807475442552977%
> > 2027146552.281 7875866 0.38851981328818402%
> > 1845397260.011 7598767 0.41176862915439172%
> > 2177206310.501 7366288 0.33833670077434846%
> > 2041629016.560 6600368 0.32328929234759562%
> > 2189308825.112 8348863 0.38134697600613249%
> > 1930990433.231 7344038 0.38032492930126544%
> > 2102320863.469 7299411 0.34720727586536809%
> > 1895798071.683 8051595 0.42470741585110772%
> > 2019648719.623 7992832 0.39575357448754711%
> > 1961118039.267 7837733 0.39965636147681766%
> > 2142238585.905 8084509 0.37738602288244455%
> > 2263212432.641 7757018 0.34274369865263332%
> > 2200111036.549 7069702 0.32133387281622078%
> > 1941699880.568 7786856 0.4010329339734075%
> > 1939777157.562 7729686 0.39848319534368681%
> > 1983015138.927 8136252 0.41029701893261827%
> > 2040218650.019 7968023 0.39054750332400873%
> > 1850721920.862 7835912 0.42339758943095634%
> > 2167986192.252 8656589 0.39929170356052646%
> > 2128868496.040 8248906 0.38747841942065214%
> > 1984840247.084 7754853 0.39070413910605312%
> > 2130780080.168 7053725 0.33103955990821227%
> > 2062729676.752 7968701 0.38631824081513272%
> > 1995756518.448 7903687 0.39602461156666058%
> > 1921150053.008 8307746 0.43243608103345821%
> > 2253731991.230 8033382 0.35644797301810893%
> > 2143807312.838 6755593 0.31512127790332323%
> > 1948787937.040 7152297 0.36701258582622248%
> > 2276500726.783 7277806 0.31969267193182554%
> > 2282733838.581 6336839 0.27759867983291148%
> > 2003104438.909 7092547 0.35407774363791977%
> > 2239684291.880 6982252 0.3117516171950766%
> > 1801833773.742 2645976 0.14684906224756283%
> > 2016683111.150 2261656 0.11214731692329717%
> > 1962727948.601 2767184 0.14098663046870061%
> > 1845203884.375 2266317 0.1228220371304734%
> > 1516914718.568 1975612 0.13023883121557553%
> > 1557730294.184 2109274 0.13540688063108641%
> > 2171303320.533 1865384 0.085910797554627022%
> > 1617322895.641 2073254 0.12819048104666192%
> > 1867107731.934 1901409 0.10183713384500154%
> > 1772588329.145 2045529 0.11539786008783279%
> > 2030802387.562 2161163 0.10641916777508319%
> > 1853583237.019 1803299 0.097287187539531861%
> > 1453728764.040 3231016 0.22225714176699726%
> > 1989811798.738 2418414 0.1215398361560542%
> > 1956758511.567 2254818 0.11523230826241863%
> > 2001579398.410 1952360 0.097540971971978793%
> > 1636515132.388 1532408 0.093638486419854422%
> > 1926271619.408 1918912 0.09961793449408439%
> > 1642519133.238 1384193 0.084272564744573439%
> > 1677033195.955 1340416 0.07992781557533149%
> > 1693983317.244 3135804 0.18511421972571418%
> > 1487434932.071 2467493 0.1658891388656871%
> > 1720442169.343 3034092 0.17635536108479918%
> > 1640362983.552 1944463 0.11853858075908964%
> > 1821382248.526 2659828 0.1460334864991977%
> > 1947322513.836 3540608 0.18181929160904178%
> > 1673422299.278 2769832 0.16551900863249205%
> > 1836039325.613 2175872 0.11850900847526999%
> > 1582929718.539 2072026 0.13089816785500888%
> > 1476014468.174 1996943 0.13529291501257767%
> > 1847131237.607 2120975 0.11482535495137695%
> > 1734796451.802 1842211 0.10619176665287874%
> > 1804827020.363 1988047 0.11015166426310204%
> > 1647250758.752 2634152 0.15991202225917941%
> > 1506833507.228 2271966 0.15077750720977479%
> > 1919459367.994 1608374 0.083793073550751385%
> > 1913364635.281 2126200 0.11112361756846952%
> > 1733934046.047 2031440 0.11715785872197679%
> > 1762796865.803 2285487 0.12965118354456009%
> > 1711072016.023 2270996 0.13272357789349024%
> > 2082560830.257 2273483 0.10916766353083858%
> > 1857948273.729 1266725 0.06817870109255604%
> > 1738287034.188 2404600 0.1383315846409251%
> > 1618942973.292 2016207 0.12453848179100423%
> > 1820789056.854 2369799 0.13015230902664757%
> > 1561747605.669 2487149 0.15925422206327566%
> > 1884502059.843 2512148 0.13330566485076115%
> > 1352203145.315 2618029 0.19361210695824271%
> > 1911003204.592 1648292 0.086252707271200574%
> > 1525244016.511 2555354 0.16753738892517536%
> > 2190575134.148 1939935 0.088558249829422828%
> > 1643983673.168 1747429 0.10629235730989092%
> > 1781900292.843 1686195 0.094629032094141294%
> > 1566821289.746 2291057 0.14622324926229507%
> > 1777199439.264 2456866 0.13824368530171682%
> > 1633063412.403 1953080 0.11959609070698031%
> > 1913601422.874 1821650 0.095194849785599556%
> > 2094732749.709 2322465 0.11087166132876074%
> > 1951529182.943 2270128 0.11632559839953495%
> > 1450396654.276 2867633 0.19771370759479912%
> > 1643954213.946 2460211 0.14965203891504558%
> > 1845971802.604 2593942 0.14051904781757141%
> > 1671974226.831 2552423 0.15265923116756236%
> > 1792483105.554 1547320 0.086322710390164162%
> > 1774273751.516 2101959 0.1184686973024323%
> > 1797523443.598 1781759 0.099122990932099045%
> > 1877038808.523 2131598 0.11356174365288201%
> > 1485614991.186 1796722 0.12094129439052281%
> > 2008042349.453 1972441 0.09822706182154485%
> > 2178564679.489 1948988 0.089462021410222761%
> > 1462911389.586 2076158 0.14191960051575969%
> > 1976013519.965 2692701 0.13626936115536772%
> > 1473561005.083 1369873 0.092963439944099252%
> > 2190713955.687 2450228 0.11184609444967988%
> > 1648795783.114 2557892 0.15513698095279177%
> > 2116292380.702 1948901 0.092090347145394241%
> > 1704227210.803 1980402 0.11620527987385389%
> > 1984573918.515 2325530 0.11718031655581404%
> > 1856414008.018 1798348 0.096872141248277158%
> > 1401593348.875 2285205 0.16304336788086488%
> > 1832475317.969 2373585 0.12952889333487622%
> > 1840826298.949 2112188 0.11474129857911804%
> > 2014475390.352 2104652 0.10447643143618861%
> > 1730176303.748 1975645 0.11418749613667999%
> > 2016553863.650 2009045 0.099627638825555156%
> > 1891795883.646 2160557 0.11420666567029553%
> > 1881160108.475 1492908 0.079361027978115894%
> > 1562754135.542 1978972 0.12663361145505117%
> > 2061996559.038 2071212 0.10044691834821971%
> > 1519528906.706 2460493 0.16192472477103448%
> > 1796244525.568 2099254 0.1168690548596764%
> > 1998463642.677 1988093 0.099481069234609226%
> > 1872169708.204 1762657 0.094150492462082555%
> > 1664425938.102 1710870 0.10279039522485223%
> > 1791543540.761 1992110 0.11119517637588673%
> > 1883913354.514 1770358 0.093972368514618113%
> > 1813806740.237 1877185 0.10349421238531283%
> > 1547586337.236 2702003 0.17459465329900728%
> > 2020313568.921 2100334 0.10396079263684484%
> > 1727289498.314 2059429 0.1192289423405978%
> >
> > Detailed time after patch:
> >
> > Total add_to_page_cache_lru percent
> > 2151489401.227 6287717 0.29224949918015392%
> > 1919030541.464 6872841 0.3581413037208262%
> > 2277104485.950 8538296 0.37496285535785828%
> > 2142847301.255 7992466 0.37298345968558083%
> > 1909650847.324 6960671 0.36449966808089612%
> > 2109123648.836 6825371 0.32361170497361974%
> > 2128503623.032 7728883 0.36311345286743746%
> > 1925232499.136 7526064 0.39091714914315673%
> > 1935780958.829 7499162 0.38739723964101919%
> > 1722848267.832 7353451 0.42681942091473007%
> > 1855159456.452 7600681 0.40970499724785564%
> > 1862769335.900 8607712 0.46209221045831578%
> > 2272365556.764 6895008 0.30342864419310028%
> > 2049429274.204 7252089 0.35385895435775488%
> > 2001218334.232 8155639 0.4075336938750293%
> > 1947131845.644 7229822 0.37130623774523025%
> > 1982915408.746 7513518 0.37891268416495716%
> > 2038654062.353 7531559 0.36943781385386831%
> > 2134879530.359 6738727 0.31564905205057731%
> > 2029761134.284 7472398 0.36814174208907074%
> > 1956557094.935 7280443 0.37210480690019776%
> > 1740007857.373 6663035 0.38293131676196024%
> > 2054278081.418 7765213 0.37800203732105886%
> > 2367585922.353 7629987 0.32226864199365651%
> > 2023763123.141 7730698 0.38199618876350999%
> > 1826074987.177 7579606 0.41507638258150648%
> > 2077873224.783 7414675 0.35683962387909118%
> > 2103719398.720 7093390 0.33718327664402131%
> > 2164758918.301 7181094 0.33172719323572736%
> > 1953199921.042 7750654 0.39681826302067191%
> > 2179298642.359 6395109 0.29344803303679207%
> > 1971922836.328 7215479 0.36591081897688477%
> > 2225552712.785 8153246 0.36634701812105075%
> > 2124780733.448 7080842 0.33325048032177529%
> > 2139511762.563 8708060 0.40701155059639843%
> > 1934365642.348 6842114 0.35371358186939283%
> > 1950765025.910 6818753 0.34954250816646476%
> > 2013188877.577 6495929 0.32266863146086228%
> > 1921391492.273 6536576 0.34020011154870117%
> > 2164698840.945 6712421 0.31008567441509277%
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> > 2073623249.374 7113197 0.34303227465005426%
> > 1938481781.041 6902169 0.35606055561138211%
> > 1963963682.421 7776006 0.39593430721765843%
> > 1807704433.895 7206899 0.39867684477995868%
> > 1902413226.299 7687850 0.40411041585093088%
> > 1718395340.661 7096452 0.41296969516166576%
> > 2014139552.830 7653595 0.37999328245384933%
> > 1976902280.499 7781174 0.3936043818026207%
> > 1920129734.441 6808420 0.3545812492707483%
> > 1786139514.638 7179970 0.4019825966089316%
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> > 1822975832.465 8627042 0.47323951565143058%
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> > 2387500130.769 6555638 0.27458168129559291%
> > 2497500671.323 6969731 0.27906823329532587%
> > 2229438175.095 6759889 0.30321042653322067%
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> > 2228213884.202 5883791 0.26405862748257614%
> > 2264526373.743 6563122 0.28982316461838858%
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> > 1843473456.551 7156295 0.38819625932607071%
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> > 1904575178.166 7484129 0.39295529448235278%
> > 2087232238.930 7372521 0.35321996577532039%
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> > 2110550986.328 7174599 0.33993961986592813%
> > 2152621184.889 7337361 0.34085704681840484%
> > 2059135774.936 6363510 0.30903790208772336%
> > 2353978555.486 7265456 0.30864580236160993%
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> > 1712556465.847 3079747 0.17983331127577226%
> > 1837380343.831 3111263 0.1693314620702272%
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> > 1825835416.807 2381575 0.13043755083713246%
> > 1969692431.120 2198750 0.11162910336969484%
> > 1867823718.088 1813348 0.097083465770326324%
> > 1929972836.031 2140104 0.11088777831718792%
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> > 2037933222.333 3290649 0.16146991294606342%
> > 1713754879.753 2136278 0.1246548164640615%
> > 2265307843.106 2195967 0.096939010151886218%
> > 2066343912.900 2117667 0.10248376307446183%
> > 2033259596.459 2652081 0.13043494321230309%
> > 2029016228.457 2447926 0.12064595470789147%
> > 1649943910.454 2243384 0.13596728869302646%
> > 2064977308.315 2517573 0.12191770775700743%
> > 1962826877.902 2403546 0.12245328546596376%
> > 1991037543.226 3214700 0.16145853255942866%
> > 1469646744.644 1960481 0.133398111290676%
> > 2195532272.023 1693642 0.077140382839349028%
> > 1902754342.931 2542547 0.13362455376575119%
> > 1922726134.774 2726990 0.14182935108023245%
> > 1629134454.130 2814497 0.17276026499009955%
> > 1442857977.322 2886065 0.2000241912483062%
> > 1782430811.270 2884583 0.16183421997427802%
> > 1574026949.337 2873023 0.18252692568003068%
> > 2064769936.712 2717133 0.13159495165484839%
> > 1621381781.294 2143854 0.13222388611576869%
> > 1783777994.311 2515565 0.14102455619605617%
> > 1561198792.593 2402227 0.15387066729728466%
> > 1658682002.165 2924639 0.17632306832669586%
> > 1675144757.604 2216513 0.13231769910860314%
> > 1712859849.041 2274046 0.13276310967725691%
> > 1448178253.374 2507727 0.17316424923226392%
> > 1621787692.726 2822681 0.17404750403892047%
> > 1924315582.555 2275728 0.11826168330344308%
> > 2044659318.750 2606738 0.12749008972280165%
> > 1559320878.499 2049522 0.13143683434629996%
> > 1641314354.590 2786145 0.16975084585158451%
> > 1769603624.855 2008994 0.11352790940200608%
> > 1707747444.550 2813289 0.16473682973311757%
> > 1366611645.499 2930513 0.21443641356721807%
> > 1435165128.768 3161655 0.22029903992400404%
> > 1440555681.860 2831258 0.19653929630435177%
> > 1627011278.312 1956565 0.12025515901954331%
> > 1668464384.654 3863649 0.23156916237089648%
> > 1589045506.115 2743558 0.17265446391825656%
> > 1766150748.153 3207045 0.18158387687765917%
> > 1668645748.936 2997211 0.17961937109246526%
> > 1808149919.182 2420007 0.13383884678626659%
> > 1831096162.185 2226869 0.12161398434382248%
> > 1473136553.216 2774496 0.18833936296964501%
> > 1873520917.567 2427200 0.12955286366121929%
> > 1971938578.205 2207736 0.11195764535473715%
> > 1670588149.850 2437810 0.14592525394238479%
> > 1912140400.200 2407058 0.12588291109524352%
> > 1925513187.452 2415130 0.12542786077699639%
> > 1658671061.956 3111210 0.18757245311382492%
> > 1917423750.996 2888924 0.15066695603928745%
> > 1553962205.772 3386946 0.21795549386076499%
> > 1834101490.364 2367281 0.12907033838842713%
> > 1626846627.678 3362957 0.20671629044711806%
> > 1519340210.104 2320735 0.15274623712098975%
> > 1725615314.262 3813557 0.22099693764197714%
> > 1725823077.103 3137784 0.1818137699993643%
> > 1633124107.941 2007344 0.12291435722731486%
> >
> > Thanks,
> > Fengguang
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