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

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Message-Id: <E71E3520-FCE5-4DAE-969D-F59F6A331611@gmail.com>
Date:	Tue, 26 May 2015 22:02:46 +0900
From:	Jungseok Lee <jungseoklee85@...il.com>
To:	Catalin Marinas <catalin.marinas@...s.arm.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 May 26, 2015, at 1:47 AM, 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.

Definitely interesting.

It looks like there are two options based on discussion.
1) Reduce the stack size with separate IRQ stack scheme
2) Figure out a generic anti-fragmentation solution

Do I miss anything?

I am still not sure about the first scheme as reviewing Minchan's findings repeatedly,
but I agree that the item should be worked actively.

Best Regards
Jungseok Lee--
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