linux-kernel - Re: [RFC][PATCH 0/6] Another go at speculative page faults

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Message-ID: <1413963289.26628.3.camel@linux-t7sj.site>
Date:	Wed, 22 Oct 2014 00:34:49 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	tglx@...utronix.de, akpm@...ux-foundation.org, riel@...hat.com,
	mgorman@...e.de, oleg@...hat.com, mingo@...hat.com,
	minchan@...nel.org, kamezawa.hiroyu@...fujitsu.com,
	viro@...iv.linux.org.uk, laijs@...fujitsu.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 0/6] Another go at speculative page faults

On Mon, 2014-10-20 at 23:56 +0200, Peter Zijlstra wrote:
> Hi,
> 
> I figured I'd give my 2010 speculative fault series another spin:
> 
>   https://lkml.org/lkml/2010/1/4/257
> 
> Since then I think many of the outstanding issues have changed sufficiently to
> warrant another go. In particular Al Viro's delayed fput seems to have made it
> entirely 'normal' to delay fput(). Lai Jiangshan's SRCU rewrite provided us
> with call_srcu() and my preemptible mmu_gather removed the TLB flushes from
> under the PTL.
> 
> The code needs way more attention but builds a kernel and runs the
> micro-benchmark so I figured I'd post it before sinking more time into it.
> 
> I realize the micro-bench is about as good as it gets for this series and not
> very realistic otherwise, but I think it does show the potential benefit the
> approach has.
> 
> (patches go against .18-rc1+)

I think patch 2/6 is borken:

error: patch failed: mm/memory.c:2025
error: mm/memory.c: patch does not apply

and related, as you mention, I would very much welcome having the
introduction of 'struct faut_env' as a separate cleanup patch. May I
suggest renaming it to fault_cxt?

Thanks,
Davidlohr

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