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Message-ID: <CA+55aFxd-smj5PkN96byr1ZJZ2bgymTBpRYQXq5Ph=4EwRDGpQ@mail.gmail.com>
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
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