Re: [PATCH 1/3] wait-simple: Introduce the simple waitqueueimplementation
From: Steven Rostedt
Date: Wed Dec 11 2013 - 20:58:15 EST
On Wed, 11 Dec 2013 20:06:37 -0500
Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> wrote:
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>
> The wait_queue is a swiss army knife and in most of the cases the
> full complexity is not needed. Here we provide a slim version, as
> it lowers memory consumption and runtime overhead.
>
> The concept originated from RT, where waitqueues are a constant
> source of trouble, as we can't convert the head lock to a raw
> spinlock due to fancy and long lasting callbacks.
>
> The smp_mb() was added (by Steven Rostedt) to fix a race condition
> with swait wakeups vs. adding items to the list.
For this part, you can also add my:
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
I'll also look at these and test them a bit against mainline.
Thanks for doing this!
-- Steve
>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> [PG: carry forward from multiple v3.10-rt patches to mainline, align
> function names with "normal" wait queue names, update commit log.]
> Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
> ---
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