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

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Message-Id: <F68D2983-226C-4704-A1E0-E79C9425B822@foss.arm.com>
Date:	Mon, 25 May 2015 19:47:15 +0300
From:	Catalin Marinas <catalin.marinas@...s.arm.com>
To:	Jungseok Lee <jungseoklee85@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	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 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.

Catalin--
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