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daemon: Sacrifice builders on OOM.

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* nix/libstore/build.cc (DerivationGoal::runChild):
Maximise our OOM score adjustment.

Change-Id: I418c763b499ca16e1ffe3c6033319112b9744f51
This commit is contained in:
Tobias Geerinckx-Rice 2023-11-19 01:00:00 +01:00
parent 38035705ed
commit d993ed43b2
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GPG key ID: 0DB0FF884F556D79
1 changed files with 6 additions and 0 deletions
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6
nix/libstore/build.cc
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@ -2154,6 +2154,12 @@ void DerivationGoal::runChild()
determinism. */
int cur = personality(0xffffffff);
if (cur != -1) personality(cur | ADDR_NO_RANDOMIZE);
/* Ask the kernel to eagerly kill us & our children if it runs out of
memory, regardless of blame, to preserve ‘real’ user data & state. */
try {
writeFile("/proc/self/oom_score_adj", "1000"); // 100%
} catch (...) { ignoreException(); }
#endif
/* Fill in the environment. */