On Mon, 2018-07-16 at 01:04 +0200, Ingo Molnar wrote: > * Rik van Riel <r...@surriel.com> wrote: > > > + /* > > + * Stop remote flushes for the previous mm. > > + * Skip the idle task; we never send init_mm TLB > > flushing IPIs, > > + * but the bitmap manipulation can cause cache > > line contention. > > + */ > > + if (real_prev != &init_mm) { > > + VM_WARN_ON_ONCE(!cpumask_test_cpu(cpu, > > + mm_cpumask(real_pr > > ev))); > > + cpumask_clear_cpu(cpu, > > mm_cpumask(real_prev)); > > BTW., could this optimization be (safely) extended to all (or most) > !task->mm > kernel threads? > > In particular softirq and threaded irq handlers could benefit greatly > I suspect in > certain networking intense workloads that happen to active them.
Yes, it could. Are there kernel threads that use something other than init_mm today? -- All Rights Reversed.
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