Messages in this thread | | | Date | Sat, 15 Aug 2020 10:42:50 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC-PATCH 1/2] mm: Add __GFP_NO_LOCKS flag |
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On Sat, Aug 15, 2020 at 01:14:53AM +0200, Thomas Gleixner wrote:
> #1 trivial fix is to force switching to an high prio thread or a soft > interrupt which does the allocation
Yeah, push the alocation out to another context. I did consider it, but why bother?
Also, raising a softirq can't be done from every context, that's a whole new problem. You can do irq_work I suppose, but not all architectures support the self-IPI yet.
All in all, it's just more complexity than the fairly trivial __alloc_page_lockless().
Whichever way around, we can't rely on the allocation.
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