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docs: Update memory pressure docs for latest GLib support for it

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As of GLib 2.90.0 (not yet released), GLib will fully support the spec,
including the `MEMORY_PRESSURE_WATCH` and `MEMORY_PRESSURE_WRITE`
environment variables, which it did not support previously.

See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/5046
This commit is contained in:
Philip Withnall
2026-07-02 14:06:50 +01:00
committed by Luca Boccassi
parent 60d982d3fc
commit 075f74a19c
1 changed files with 6 additions and 3 deletions
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9
docs/PRESSURE.md
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@@ -241,9 +241,12 @@ a custom handler should be provided to take appropriate action:
Other programming environments might have native APIs to watch memory
pressure/low memory events. Most notable is probably GLib's
[GMemoryMonitor](https://docs.gtk.org/gio/iface.MemoryMonitor.html). As of GLib
2.86.0, it uses the per-cgroup PSI kernel file to monitor for memory pressure,
but does not yet read the environment variables recommended above.
[GMemoryMonitor](https://docs.gtk.org/gio/iface.MemoryMonitor.html). Versions
2.90.0 and later of GLib fully support this per-cgroup PSI kernel file protocol.
Versions of GLib between 2.86.0 and 2.90.0 used the per-cgroup PSI kernel file
to monitor for memory pressure, but did not read the environment variables
recommended above.
In older versions, it used the per-system Linux PSI interface as the backend, but operated
differently than the above: memory pressure events were picked up by a system