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Merge pull request #2085 from Syphdias/option-to-limit-procs

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Add Config Option to Limit Number of Processes
This commit is contained in:
Mitchell Hashimoto
2024-08-11 15:57:13 -07:00
committed by GitHub
parent ed49670d2f a158a1d45f
commit 23de1fb4ea
3 changed files with 25 additions and 9 deletions
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12
src/apprt/gtk/cgroup.zig
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@ -66,8 +66,16 @@ pub fn init(app: *App) ![]const u8 {
// can be monitored by things like systemd-oomd to kill if needed, // can be monitored by things like systemd-oomd to kill if needed,
// versus an instant hard kill. // versus an instant hard kill.
if (app.config.@"linux-cgroup-memory-limit") |limit| { if (app.config.@"linux-cgroup-memory-limit") |limit| {
try internal_os.cgroup.configureMemoryLimit(surfaces, .{ try internal_os.cgroup.configureLimit(surfaces, .{
.high = limit, .memory_high = limit,
});
}
// Configure the "max" pids limit. This is a hard limit and cannot be
// exceeded.
if (app.config.@"linux-cgroup-processes-limit") |limit| {
try internal_os.cgroup.configureLimit(surfaces, .{
.pids_max = limit,
}); });
} }

7
src/config/Config.zig
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@ -1276,6 +1276,13 @@ keybind: Keybinds = .{},
/// pressure. /// pressure.
@"linux-cgroup-memory-limit": ?u64 = null, @"linux-cgroup-memory-limit": ?u64 = null,
/// Number of processes limit for any individual terminal process (tab, split,
/// window, etc.). If this is unset then no limit will be set.
///
/// Note that this sets the "pids.max" configuration for the process number
/// controller, which is a hard limit.
@"linux-cgroup-processes-limit": ?u64 = null,
/// If this is false, then any cgroup initialization (for linux-cgroup) /// If this is false, then any cgroup initialization (for linux-cgroup)
/// will be allowed to fail and the failure is ignored. This is useful if /// will be allowed to fail and the failure is ignored. This is useful if
/// you view cgroup isolation as a "nice to have" and not a critical resource /// you view cgroup isolation as a "nice to have" and not a critical resource

15
src/os/cgroup.zig
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@ -180,18 +180,19 @@ pub fn configureControllers(
try file.writer().writeAll(v); try file.writer().writeAll(v);
} }
pub const MemoryLimit = union(enum) { pub const Limit = union(enum) {
/// memory.high memory_high: usize,
high: usize, pids_max: usize,
}; };
/// Configure the memory limit for the given cgroup. Use the various /// Configure a limit for the given cgroup. Use the various
/// fields in MemoryLimit to configure a specific type of limit. /// fields in Limit to configure a specific type of limit.
pub fn configureMemoryLimit(cgroup: []const u8, limit: MemoryLimit) !void { pub fn configureLimit(cgroup: []const u8, limit: Limit) !void {
assert(cgroup[0] == '/'); assert(cgroup[0] == '/');
const filename, const size = switch (limit) { const filename, const size = switch (limit) {
.high => |v| .{ "memory.high", v }, .memory_high => |v| .{ "memory.high", v },
.pids_max => |v| .{ "pids.max", v },
}; };
// Open our file // Open our file