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ke: optimize IPL operations

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This commit is contained in:
Loïc Grégoire
2026-08-07 15:41:12 -04:00
parent 5bb264a9ae
commit 52f62b8354
5 changed files with 105 additions and 46 deletions
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src/kern/dpc.zig
+9 -10
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@@ -72,11 +72,11 @@ pub fn enqueue(dpc: *Dpc, arg: ?*anyopaque) void {
}
fn dispatch_queue(cpu: u32) void {
const ipl_cpu = ki.ipl.percpu.remote(cpu);
const dpc_cpu = pcpu.remote(cpu);
const sched_cpu = ki.sched.percpu.remote(cpu);
const ipl_cpu = ki.ipl.cpu_ipl.local();
const dpc_cpu = pcpu.local();
const sched_cpu = ki.sched.percpu.local();
ipl_cpu.ipl = .Dispatch;
ipl_cpu.* = .Dispatch;
// Mark as handled, this must be done before enabling interrupts or we will
// race.
@@ -148,13 +148,13 @@ fn dispatch_queue(cpu: u32) void {
_ = ki.impl.disable_interrupts();
}
/// Dispatch the DPC queue on `cpu`.
pub fn dispatch(cpu: u32) void {
/// Dispatch the DPC queue on the current CPU.
pub fn dispatch() void {
// DPC processing is done at IPL Dispatch.
// Don't call lower/raise here because they might call us again recursively.
var mycpu = cpu;
const old_ipl = ki.ipl.percpu.remote(mycpu).ipl;
const int_state = ki.impl.disable_interrupts();
const old_ipl = ki.ipl.cpu_ipl.local().*;
var mycpu = ke.cpu.current();
while (ki.ipl.is_softint_pending(.Dispatch)) {
dispatch_queue(mycpu);
@@ -162,7 +162,6 @@ pub fn dispatch(cpu: u32) void {
mycpu = ke.cpu.current();
}
ki.ipl.percpu.remote(mycpu).ipl = old_ipl;
ki.ipl.cpu_ipl.local().* = old_ipl;
ki.impl.restore_interrupts(int_state);
}