Re: [PATCH] bpf: convert hashtab lock to raw lock

[Shi, Yang]

On 11/2/2015 9:24 AM, Steven Rostedt wrote:
> On Mon, 02 Nov 2015 09:12:29 -0800
> "Shi, Yang" <yang.shi@xxxxxxxxxx> wrote:
>
> > Yes, it is common practice for converting sleepable spin lock to raw
> > spin lock in -rt to avoid scheduling in atomic context bug.
>
> Note, in a lot of cases we don't just convert spin_locks to raw because
> of atomic context. There's times we need to change the design where the
> lock is not taken in atomic context (switching preempt_disable() to a
> local_lock() for example).

Yes, definitely. Understood.

Thanks,
Yang

> But bpf is much like ftrace and kprobes where they can be taken almost
> anywhere, and the do indeed need to be raw.
>
> -- Steve

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