On Mon, 9 Nov 2020 13:17:08 +0100
Peter Zijlstra wrote:
> This patch is misleading, it doesn't optimize it nearly as much as is
> possible and actually fixes the softirq case, which isn't at all
> mentioned.
This is actually an old patch I had for some time (it's been in the
ring buffer code for
On Thu, Nov 05, 2020 at 09:32:38PM -0500, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)"
>
> The preempt_count() is not a simple location in memory, it could be part of
> per_cpu code or more. Each access to preempt_count(), or one of its accessor
> functions (like in_interrupt()) takes
From: "Steven Rostedt (VMware)"
The preempt_count() is not a simple location in memory, it could be part of
per_cpu code or more. Each access to preempt_count(), or one of its accessor
functions (like in_interrupt()) takes several cycles. By reading
preempt_count() once, and then doing tests to f
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