From d993ed43b2bae8717437aa27d9d33fd223a6411f Mon Sep 17 00:00:00 2001 From: Tobias Geerinckx-Rice Date: Sun, 19 Nov 2023 01:00:00 +0100 Subject: daemon: Sacrifice builders on OOM. * nix/libstore/build.cc (DerivationGoal::runChild): Maximise our OOM score adjustment. Change-Id: I418c763b499ca16e1ffe3c6033319112b9744f51 --- nix/libstore/build.cc | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc index e8259aa4e8..54555b92d7 100644 --- a/nix/libstore/build.cc +++ b/nix/libstore/build.cc @@ -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. */ -- cgit v1.2.3