linux-kernel - Re: [LKP] [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression

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Date:	Thu, 11 Aug 2016 15:30:08 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Christoph Hellwig <hch@....de>,
	"Huang, Ying" <ying.huang@...el.com>,
	Dave Chinner <david@...morbit.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Bob Peterson <rpeterso@...hat.com>,
	Wu Fengguang <fengguang.wu@...el.com>, LKP <lkp@...org>
Subject: Re: [LKP] [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression

On Thu, Aug 11, 2016 at 3:16 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Huh?  The very first thing it does is
>         char *kaddr = kmap_atomic(page), *p = kaddr + offset;
>
> If _that_ does not disable pagefaults, we are very deep in shit.

Right you are - it does, even with highmem disabled. Never mind, those
pagefault_disabled/enabled() calls are clearly bogus.

         Linus