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SubjectRe: 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;
> }
>
-
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