Messages in this thread | | | Date | Thu, 21 Jun 2001 17:22:03 +0200 | From | Walter Hofmann <> | Subject | Re: Linux 2.4.5-ac15 |
| |
On Wed, 20 Jun 2001, Rik van Riel wrote:
> > FWIW, here is the vmstat output for the second (short) hang. Taken with > > ac14, vmstat 1 was started (long) before the hang and interrupted about > > five seconds after it. The machine has 128MB RAM and 256MB swap. > > > procs memory swap io system cpu > > r b w swpd free buff cache si so bi bo in cs us sy id > > 1 0 0 77000 1464 18444 67324 8 0 152 224 386 1345 26 19 55 > > 2 4 2 77084 1524 18396 66904 0 1876 108 2220 2464 66079 1 98 1 > > Does the following patch help with this problem, or are > you both experiencing something unrelated to this particular > buglet ?
Hi Rik,
I tried 2.4.6-pre5 with your patch (quoted at the end). Oberservations: I still see this hang, it seemed to last longer than with ac14/ac15 (say, 30 seconds). There was no heavy swapping going on, eiter before or after the hang. During the hang there was no disc activity.
Compared with 2.4.5ac I saw that 2.4.6-pre5 uses much less swap (according to xosview). With the load I tried (many open browser windows) the ac series used to use 80-100MB of swap; 2.4.6-pre5 only used 40MB swap for roughly the same number of windows open.
I forgot to press SysRq-T to get a trace, I'm afraid. kdb didn't compile with this kernel either (although patching worked).
I had vmstat running in another window and stopped it a couple of seconds after the hang, here are the last line of its output:
procs memory swap io system cpu r b w swpd free buff cache si so bi bo in cs us sy id 2 0 0 36424 3232 888 45036 0 0 4 0 255 3250 56 13 32 1 0 0 36424 3096 888 45048 0 0 12 0 140 1010 37 6 58 4 0 0 36424 2964 888 45060 0 0 12 0 228 1304 90 6 4 3 0 0 36424 3052 900 44668 0 0 88 0 259 2522 88 12 0 2 0 0 36424 3164 900 44524 0 0 4 0 144 3556 87 13 0 3 0 0 36424 2812 900 44468 0 0 8 0 211 2007 87 11 3 5 0 0 36424 2812 912 44108 0 0 20 0 196 1243 92 8 0 4 0 0 36424 2812 920 43836 0 0 108 0 271 2928 88 12 0 4 0 0 36424 2808 920 42728 0 0 228 0 284 2042 85 11 5 2 0 0 36424 3112 924 42416 76 5004 288 5260 385 948 84 11 6 4 0 0 36424 2816 940 42016 0 0 100 0 223 1252 94 3 3 3 0 0 36424 2812 944 41472 0 0 0 0 229 1392 92 8 0 3 0 0 36424 2812 948 41112 0 0 68 0 264 1107 95 3 2 1 0 0 36424 2932 948 40756 0 0 0 0 262 879 92 8 0 2 0 0 36424 2808 952 40740 0 0 0 0 191 2244 36 12 53 4 0 0 36424 2808 952 40504 32 0 32 0 242 975 93 6 2 2 0 0 36424 3252 956 40008 0 0 64 0 249 2505 85 15 0 3 0 0 36424 2972 956 39996 0 0 8 0 127 1419 88 10 2 3 0 0 36424 2988 956 39108 0 0 20 0 247 1632 83 17 0 2 0 0 36424 3332 964 38496 0 0 176 0 218 955 91 9 0 3 0 0 36424 3180 964 38724 120 0 232 0 112 3026 89 11 0 procs memory swap io system cpu r b w swpd free buff cache si so bi bo in cs us sy id 4 0 0 36424 3020 968 38800 64 0 64 0 158 2008 87 13 1 3 0 0 36424 2808 936 38192 0 0 192 552 232 678 90 6 4 2 0 0 36424 2988 936 37632 0 0 0 4 167 678 98 2 0 2 0 0 36424 2868 940 37592 0 0 4 104 177 1137 93 7 0 3 0 0 36396 2852 940 37592 0 0 0 20 185 1125 93 7 0 4 0 0 36396 2848 984 37624 0 0 60 64 193 1245 92 8 0 5 0 0 36396 2244 1000 37656 0 0 28 176 161 2377 69 31 0 1 0 0 36396 2364 1004 37660 0 0 8 244 180 1836 75 25 0 1 0 1 36396 2484 1004 37780 100 0 104 248 178 2369 61 38 1 4 0 1 36384 2020 1012 38328 520 0 560 148 185 1696 58 19 22 6 0 0 45940 1744 1012 47676 108 724 368 868 6886 186930 1 99 0 2 0 1 45856 2528 1028 46480 272 5480 752 5524 264 2413 82 18 0 5 0 0 46072 2732 1028 45740 0 6636 8 6636 297 1165 84 16 0 4 0 0 46072 2532 1028 45776 0 0 20 4 245 3310 88 13 0 3 0 0 46072 2392 1040 45336 0 0 24 0 119 1296 91 9 0 2 0 0 46072 2832 1052 44872 0 0 48 4 113 1276 91 9 0 3 0 0 46072 2392 1056 44544 0 0 0 0 104 943 97 3 0 2 0 0 46068 2808 1056 44112 1104 0 1164 0 144 870 70 11 19 1 0 0 46052 2812 1060 44044 216 0 252 0 118 3325 20 6 74 0 1 0 45964 3000 1104 43216 676 0 1576 0 198 1365 2 8 90 1 0 0 45964 2976 1212 42948 0 0 332 0 187 1319 10 8 83 procs memory swap io system cpu r b w swpd free buff cache si so bi bo in cs us sy id 1 0 0 45964 2928 1212 42948 0 0 0 0 113 1251 6 3 92 1 0 0 45964 2924 1212 42948 0 0 0 0 112 1217 2 6 92
Walter
> --- linux/mm/swapfile.c.~1~ Thu May 3 16:34:46 2001 > +++ linux/mm/swapfile.c Thu May 3 16:36:07 2001 > @@ -67,8 +67,14 @@ > } > /* No luck, so now go finegrined as usual. -Andrea */ > for (offset = si->lowest_bit; offset <= si->highest_bit ; offset++) { > - if (si->swap_map[offset]) > + if (si->swap_map[offset]) { > + /* Any full pages we find we should avoid > + * looking at next time. */ > + if (offset == si->lowest_bit) > + si->lowest_bit++; > continue; > + } > + > got_page: > if (offset == si->lowest_bit) > si->lowest_bit++; > @@ -79,6 +85,7 @@ > si->cluster_next = offset+1; > return offset; > } > + si->highest_bit = 0; > return 0; > } > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |