linux-kernel - Re: [RFC PATCH 2/2] arm64: Implement vmalloc based thread

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Message-ID: <5601369.jDWtB6nFJC@wuerfel>
Date:	Mon, 25 May 2015 22:29:40 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Catalin Marinas <catalin.marinas@...s.arm.com>
Cc:	Jungseok Lee <jungseoklee85@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	"barami97@...il.com" <barami97@...il.com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 2/2] arm64: Implement vmalloc based thread_info allocator

On Monday 25 May 2015 19:47:15 Catalin Marinas wrote:
> On 25 May 2015, at 13:01, Jungseok Lee <jungseoklee85@...il.com> wrote:
> 
> >> Could the stack size be reduced to 8KB perhaps?
> > 
> > I guess probably not.
> > 
> > A commit, 845ad05e, says that 8KB is not enough to cover SpecWeb benchmark.
> 
> We could go back to 8KB stacks if we implement support for separate IRQ 
> stack on arm64. It's not too complicated, we would have to use SP0 for (kernel) threads 
> and SP1 for IRQ handlers.

I think most architectures that see a lot of benchmarks have moved to
irqstacks at some point, that definitely sounds like a useful idea,
even if the implementation turns out to be a bit more tricky than
what you describe.

There are a lot of workloads that would benefit from having lower
per-thread memory cost.

	Arnd
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