[SAC] OOM killer on tracsvn

[Sandro Santilli]

I've found the OOM Killer kicking in often on the TracSVN machine,
and mostly killing Apache:

Sep  1 06:52:56 git kernel: [17261983.933073] Out of memory: Kill process 29329 (apache2) score 254 or sacrifice child
Sep  1 06:57:05 git kernel: [17262225.513234] Out of memory: Kill process 29475 (apache2) score 186 or sacrifice child
Sep  1 07:00:32 git kernel: [17262439.763616] Out of memory: Kill process 29542 (apache2) score 210 or sacrifice child
Sep  1 07:17:39 git kernel: [17263466.984870] Out of memory: Kill process 29594 (apache2) score 267 or sacrifice child
Sep  1 08:53:18 git kernel: [17269205.178188] Out of memory: Kill process 23583 (apache2) score 156 or sacrifice child
Sep  1 08:58:11 git kernel: [17269498.021185] Out of memory: Kill process 23729 (apache2) score 190 or sacrifice child
Sep  1 09:03:43 git kernel: [17269829.824966] Out of memory: Kill process 24118 (apache2) score 222 or sacrifice child
Sep  1 09:08:22 git kernel: [17270109.803999] Out of memory: Kill process 24364 (apache2) score 309 or sacrifice child
Sep  3 11:19:44 git kernel: [17450790.920356] Out of memory: Kill process 4816 (apache2) score 299 or sacrifice child
Sep  3 11:23:10 git kernel: [17450997.481283] Out of memory: Kill process 4916 (apache2) score 201 or sacrifice child
Sep  5 00:21:48 git kernel: [17584109.845014] Out of memory: Kill process 2562 (apache2) score 175 or sacrifice child
Sep  5 00:26:12 git kernel: [17584379.936770] Out of memory: Kill process 2818 (apache2) score 187 or sacrifice child
Sep  5 00:30:36 git kernel: [17584643.198125] Out of memory: Kill process 3351 (apache2) score 243 or sacrifice child
Sep  5 00:40:50 git kernel: [17585255.206892] Out of memory: Kill process 2990 (apache2) score 323 or sacrifice child
Sep  5 09:45:27 git kernel: [17617934.310446] Out of memory: Kill process 8539 (apache2) score 262 or sacrifice child
Sep  6 00:23:53 git kernel: [48504.691523] Out of memory: Kill process 20254 (apache2) score 164 or sacrifice child
Sep  6 00:28:01 git kernel: [48753.099289] Out of memory: Kill process 20330 (apache2) score 159 or sacrifice child
Sep  6 00:32:13 git kernel: [49002.137863] Out of memory: Kill process 20395 (apache2) score 174 or sacrifice child
Sep  6 00:37:17 git kernel: [49309.507685] Out of memory: Kill process 20950 (apache2) score 280 or sacrifice child
Sep  6 01:01:51 git kernel: [50783.765895] Out of memory: Kill process 28945 (apache2) score 197 or sacrifice child
Sep  6 01:07:07 git kernel: [51095.220359] Out of memory: Kill process 29060 (apache2) score 205 or sacrifice child
Sep  6 01:11:02 git kernel: [51333.870239] Out of memory: Kill process 29344 (apache2) score 183 or sacrifice child
Sep  6 01:16:21 git kernel: [51653.844987] Out of memory: Kill process 29159 (apache2) score 323 or sacrifice child

Would it make more sense to disable the OOM killer so to actually
*refuse* to allocate non-available memory rather than pretending
memory is infinite and then killing arbitrary processes ?

If not else, it might give processes a chance to do something upon
ending out of memory (like I guess Apache could spawn less child?).

--strk; 

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