Re: Restartable Sequences system call merged into Linux

[Pavel Machek <pavel at ucw dot cz>]

Hi!

> >> - rseq_preempt(): on preemption, the scheduler sets the TIF_NOTIFY_RESUME thread
> >>   flag, so rseq_handle_notify_resume() can check whether it's in a rseq critical
> >>   section when returning to user-space,
> >> - rseq_signal_deliver(): on signal delivery, rseq_handle_notify_resume() checks
> >>   whether it's in a rseq critical section,
> >> - rseq_migrate: on migration, the scheduler sets TIF_NOTIFY_RESUME as well,
> > 
> > Yes, this is not likely to be noticeable.
> > 
> > But the proposal wanted to add a syscall to thread creation, right?
> > And I believe that may be noticeable.
> 
> Fair point! Do we have a standard benchmark that would stress this ?

Web server performance benchmarks basically test clone() performance
in many cases.
									Pavel

-- 
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