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From: Alexey Dobriyan <adobriyan@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] sched: make nr_running() return "unsigned int"
Date: Thu, 12 Mar 2020 20:09:42 +0300	[thread overview]
Message-ID: <20200312170942.GA7151@avx2> (raw)
In-Reply-To: <20200312104427.GR12561@hirez.programming.kicks-ass.net>

On Thu, Mar 12, 2020 at 11:44:27AM +0100, Peter Zijlstra wrote:
> On Thu, Mar 12, 2020 at 12:06:08AM +0300, Alexey Dobriyan wrote:
> > I don't anyone have been crazy enough to spawn 2^32 threads.
> > It'd require absurd amounts of physical memory.
> 
> And we're going to 5 level page-tables because 48 bits physical isn't
> enough. 57 bits of physical is plenty space to spawn that many tasks and
> still have some left over.
> 
> Now 32 bit tasks is indeed insane, but memory isn't the problem. The
> actual limit is the pid-space, which is 30 bits.

Indeed, pid space limit is even better!

      reply	other threads:[~2020-03-12 17:09 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 21:06 Alexey Dobriyan
2020-03-11 21:08 ` [PATCH 2/2] sched: make nr_iowait_cpu() " Alexey Dobriyan
2020-03-12 10:44 ` [PATCH 1/2] sched: make nr_running() " Peter Zijlstra
2020-03-12 17:09   ` Alexey Dobriyan [this message]

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