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feat: zram, systemd-oomd, and user-slice memory caps #20

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Merged
bupd merged 1 commit into from
Aug 12, 2026
Merged

feat: zram, systemd-oomd, and user-slice memory caps #20

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31 changes: 31 additions & 0 deletions Containerfile.pc
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,7 @@ RUN --mount=type=tmpfs,dst=/tmp --mount=type=cache,dst=/usr/lib/sysimage/cache/p
pamixer \
matugen \
power-profiles-daemon \
zram-generator \
sudo \
wireplumber \
xdg-utils \
Expand Down Expand Up @@ -210,6 +211,35 @@ RUN install -d /usr/lib/systemd/logind.conf.d && \
'HandleLidSwitchExternalPower=ignore' \
> /usr/lib/systemd/logind.conf.d/10-lid-ignore.conf

# Builds (cargo/webpack/tsc/link steps) can balloon memory on this laptop's
# 8GiB and, with no swap and no OOM intervention, thrash the kernel until it
# hard-hangs. Three layers of defense:
# 1. zram: compressed RAM swap absorbs spikes instead of the kernel having
# nowhere to reclaim to.
# 2. systemd-oomd: watches memory pressure (PSI) and kills the worst
# offending cgroup before the whole system grinds to a halt.
# 3. user-.slice MemoryHigh/MemoryMax: caps everything the user session runs
# (builds, browser, terminal) at 85% of RAM, always reserving headroom
# for system.slice and the kernel.
RUN install -d /usr/lib/systemd/oomd.conf.d /usr/lib/systemd/system/user-.slice.d && \
printf '%s\n' \
'[zram0]' \
'zram-size = min(ram, 8192)' \
'compression-algorithm = zstd' \
'swap-priority = 100' \
> /usr/lib/systemd/zram-generator.conf && \
printf '%s\n' \
'[OOM]' \
'SwapUsedLimit=90%' \
> /usr/lib/systemd/oomd.conf.d/10-swap-limit.conf && \
printf '%s\n' \
'[Slice]' \
'MemoryHigh=85%' \
'MemoryMax=92%' \
'ManagedOOMMemoryPressure=kill' \
'ManagedOOMMemoryPressureLimit=50%' \
> /usr/lib/systemd/system/user-.slice.d/10-resource-limits.conf

# Keep the initramfs aligned with the final kernel, firmware, microcode, and
# NVIDIA modules by running the same generic builder as the Bootcrew-style
# base after the desktop package transaction.
Expand Down Expand Up @@ -239,6 +269,7 @@ RUN systemctl enable \
gdm \
systemd-resolved \
systemd-timesyncd \
systemd-oomd.socket \
fstrim.timer

RUN ln -sf /usr/share/zoneinfo/Asia/Kolkata /etc/localtime && \
Expand Down
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