Re: [RFC][PATCH] HWPOISON: remove the unsafe __set_page_locked()

Wu Fengguang
2009-09-26T11:32:13Z

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% ..

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%
> 1992440404.239 7467130 0.3747730664422067%
> 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%
> 2011990483.317 6739406 0.33496212113733792%
> 2186643920.919 7830962 0.35812698743876015%
> 1822975832.465 8627042 0.47323951565143058%
> 1872249428.425 7264440 0.38800599373722838%
> 1971668701.573 6818269 0.34581210294408871%
> 2054585589.388 7261214 0.35341501651254642%
> 2252858576.565 7228902 0.32087686618225808%
> 2196771348.820 6634658 0.30201859668116204%
> 2224872312.502 6948714 0.31231967609798522%
> 1924947573.139 6935037 0.360271474235066%
> 2070207954.999 7564561 0.36540102078796494%
> 2070702822.858 6994172 0.33776802362912656%
> 2099826181.510 7199665 0.34286957003377627%
> 2369037401.585 7009501 0.29587971027009985%
> 2109093017.803 7056062 0.33455432929886414%
> 2141046841.968 7831694 0.36578807368835009%
> 2284785719.942 7358167 0.3220506385249462%
> 2088247084.213 6857813 0.32840045853982414%
> 1880913709.753 6697468 0.35607523967059107%
> 1984586172.943 7361786 0.37094816543455983%
> 2130320004.839 7840067 0.36802297223850727%
> 2314059227.236 6669054 0.28819720435443524%
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> 1924315582.555 2275728 0.11826168330344308%
> 2044659318.750 2606738 0.12749008972280165%
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> 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%
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> 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