Re: [PATCH] signal: Allow RT tasks to cache one sigqueue struct

[Thomas Gleixner]

On Thu, Mar 04 2021 at 13:04, Eric W. Biederman wrote:
> Thomas Gleixner <tglx@xxxxxxxxxxxxx> writes:
>>
>> We could of course do the caching unconditionally for all tasks.
>
> Is there any advantage to only doing this for realtime tasks?

It was mostly to avoid tons of cached entries hanging around all over
the place. So I limited it to the case which the RT users deeply cared
about. Also related to the accounting question below.

> If not it probably makes sense to do the caching for all tasks.
>
> I am wondering if we want to count the cached sigqueue structure to the
> users rt signal rlimit?

That makes some sense, but that's a user visible change as a single
signal will up the count for a tasks lifetime while today it is removed
from accounting again once the signal is delivered. So that needs some
thought.

Thanks,

        tglx