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Date: Mon, 17 Jan 2011 11:34:08 -0700 From: xing lin <linxingnku@...il.com> To: Américo Wang <xiyou.wangcong@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: BUG: unable to handle kernel paging request at ffff8800cf669000 On Sun, Jan 16, 2011 at 11:57 PM, Américo Wang <xiyou.wangcong@...il.com> wrote: > Isn't this what KSM does? :) Check mm/ksm.c, it uses jhash2(). Oh, it seems mm/ksm.c does do content-based sharing. I have not known this and am interested to see the percentage of duplicated pages. If there are more than 10% duplicated pages, then I plan to implement content-based page sharing. Your input is really helpful to me. Thanks. >From the configuration file, I found KSM is enabled in my Ubuntu but I still found many duplicated pages when I compile Linux-2.6.37. (Freeable pages means the number of pages which are duplicated and can be freed. Freeable and nonzeroed pages means the number of pages which can be freed and do not contain all 0s.) make12G_??.als shows the number of duplicated pages when Linux-2.6.37 is being compiled. utos@...e:/boot$ grep CONFIG_KSM /boot/config-2.6.32-24-generic CONFIG_KSM=y utos@...e:/tmp/data$ grep Freeable make* make12G_00.als:Freeable pages: 42037 (22.29% of allocated pages) make12G_00.als:Freeable and nonzeroed pages: 1220 (0.65% of allocated pages) make12G_01.als:Freeable pages: 42441 (19.38% of allocated pages) make12G_01.als:Freeable and nonzeroed pages: 1409 (0.64% of allocated pages) make12G_02.als:Freeable pages: 42831 (17.51% of allocated pages) make12G_02.als:Freeable and nonzeroed pages: 1524 (0.62% of allocated pages) make12G_03.als:Freeable pages: 43182 (16.27% of allocated pages) make12G_03.als:Freeable and nonzeroed pages: 1876 (0.71% of allocated pages) make12G_05.als:Freeable pages: 48564 (15.41% of allocated pages) make12G_05.als:Freeable and nonzeroed pages: 7171 (2.27% of allocated pages) make12G_06.als:Freeable pages: 50040 (14.83% of allocated pages) make12G_06.als:Freeable and nonzeroed pages: 8629 (2.56% of allocated pages) make12G_07.als:Freeable pages: 50649 (14.27% of allocated pages) make12G_07.als:Freeable and nonzeroed pages: 9170 (2.58% of allocated pages) make12G_08.als:Freeable pages: 53225 (13.54% of allocated pages) make12G_08.als:Freeable and nonzeroed pages: 11655 (2.97% of allocated pages) make12G_09.als:Freeable pages: 57595 (13.54% of allocated pages) make12G_09.als:Freeable and nonzeroed pages: 15946 (3.75% of allocated pages) make12G_10.als:Freeable pages: 58137 (12.99% of allocated pages) make12G_10.als:Freeable and nonzeroed pages: 16419 (3.67% of allocated pages) make12G_11.als:Freeable pages: 58561 (12.56% of allocated pages) make12G_11.als:Freeable and nonzeroed pages: 16810 (3.61% of allocated pages) make12G_12.als:Freeable pages: 59325 (12.14% of allocated pages) make12G_12.als:Freeable and nonzeroed pages: 17556 (3.59% of allocated pages) make12G_13.als:Freeable pages: 60144 (11.85% of allocated pages) make12G_13.als:Freeable and nonzeroed pages: 18293 (3.61% of allocated pages) make12G_14.als:Freeable pages: 60521 (11.40% of allocated pages) make12G_14.als:Freeable and nonzeroed pages: 18661 (3.51% of allocated pages) make12G_15.als:Freeable pages: 61205 (11.07% of allocated pages) make12G_15.als:Freeable and nonzeroed pages: 19223 (3.48% of allocated pages) make12G_16.als:Freeable pages: 61906 (10.86% of allocated pages) make12G_16.als:Freeable and nonzeroed pages: 19961 (3.50% of allocated pages) make12G_17.als:Freeable pages: 62701 (10.49% of allocated pages) make12G_17.als:Freeable and nonzeroed pages: 20537 (3.44% of allocated pages) make12G_18.als:Freeable pages: 63207 (10.21% of allocated pages) make12G_18.als:Freeable and nonzeroed pages: 20978 (3.39% of allocated pages) make12G_19.als:Freeable pages: 63689 (9.94% of allocated pages) make12G_19.als:Freeable and nonzeroed pages: 21522 (3.36% of allocated pages) make12G_20.als:Freeable pages: 65469 (9.91% of allocated pages) make12G_20.als:Freeable and nonzeroed pages: 23098 (3.50% of allocated pages) make12G_21.als:Freeable pages: 65979 (9.67% of allocated pages) make12G_21.als:Freeable and nonzeroed pages: 23554 (3.45% of allocated pages) make12G_22.als:Freeable pages: 66527 (9.40% of allocated pages) make12G_22.als:Freeable and nonzeroed pages: 23997 (3.39% of allocated pages) make12G_23.als:Freeable pages: 66887 (9.14% of allocated pages) make12G_23.als:Freeable and nonzeroed pages: 24326 (3.33% of allocated pages) make12G_24.als:Freeable pages: 67329 (8.85% of allocated pages) make12G_24.als:Freeable and nonzeroed pages: 24678 (3.25% of allocated pages) make12G_25.als:Freeable pages: 68351 (8.82% of allocated pages) make12G_25.als:Freeable and nonzeroed pages: 25537 (3.30% of allocated pages) make12G_26.als:Freeable pages: 68913 (8.57% of allocated pages) make12G_26.als:Freeable and nonzeroed pages: 26067 (3.24% of allocated pages) make12G_27.als:Freeable pages: 69400 (8.44% of allocated pages) make12G_27.als:Freeable and nonzeroed pages: 26426 (3.21% of allocated pages) make12G_28.als:Freeable pages: 70063 (8.25% of allocated pages) make12G_28.als:Freeable and nonzeroed pages: 27007 (3.18% of allocated pages) make12G_29.als:Freeable pages: 71409 (8.11% of allocated pages) make12G_29.als:Freeable and nonzeroed pages: 28383 (3.22% of allocated pages) make12G_30.als:Freeable pages: 72235 (8.01% of allocated pages) make12G_30.als:Freeable and nonzeroed pages: 29074 (3.23% of allocated pages) make12G_31.als:Freeable pages: 73271 (7.70% of allocated pages) make12G_31.als:Freeable and nonzeroed pages: 29872 (3.14% of allocated pages) make12G_32.als:Freeable pages: 73799 (7.54% of allocated pages) make12G_32.als:Freeable and nonzeroed pages: 30314 (3.10% of allocated pages) make12G_33.als:Freeable pages: 74712 (7.41% of allocated pages) make12G_33.als:Freeable and nonzeroed pages: 31019 (3.08% of allocated pages) make12G_34.als:Freeable pages: 75264 (7.27% of allocated pages) make12G_34.als:Freeable and nonzeroed pages: 31459 (3.04% of allocated pages) make12G_35.als:Freeable pages: 75883 (7.15% of allocated pages) make12G_35.als:Freeable and nonzeroed pages: 31934 (3.01% of allocated pages) make12G_36.als:Freeable pages: 76961 (7.07% of allocated pages) make12G_36.als:Freeable and nonzeroed pages: 32928 (3.03% of allocated pages) make12G_37.als:Freeable pages: 77797 (6.96% of allocated pages) make12G_37.als:Freeable and nonzeroed pages: 33726 (3.02% of allocated pages) make12G_38.als:Freeable pages: 78814 (6.85% of allocated pages) make12G_38.als:Freeable and nonzeroed pages: 34557 (3.00% of allocated pages) make12G_39.als:Freeable pages: 139392 (10.02% of allocated pages) make12G_39.als:Freeable and nonzeroed pages: 91904 (6.60% of allocated pages) make12G_40.als:Freeable pages: 145535 (9.78% of allocated pages) make12G_40.als:Freeable and nonzeroed pages: 97907 (6.58% of allocated pages) make12G_41.als:Freeable pages: 152047 (9.26% of allocated pages) make12G_41.als:Freeable and nonzeroed pages: 104118 (6.34% of allocated pages) make12G_42.als:Freeable pages: 157866 (8.90% of allocated pages) make12G_42.als:Freeable and nonzeroed pages: 109994 (6.20% of allocated pages) -- Regards, Xing School of Computing, University of Utah http://www.cs.utah.edu/~xinglin/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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