linux-kernel - Re: [REGRESSION] 998ef75ddb and aio-dio-invalidate-failure w/ data=journal

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Message-ID: <20151006075652.GA11757@gmail.com>
Date:	Tue, 6 Oct 2015 09:56:52 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Theodore Ts'o <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] 998ef75ddb and aio-dio-invalidate-failure w/
 data=journal


* H. Peter Anvin <hpa@...or.com> wrote:

> On October 5, 2015 1:22:44 PM PDT, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> >
> > We could probably do them outside the loop, rather than tightly around the 
> > actual move instructions. Peter (hpa), is there some sane interface to try to 
> > do that?
> 
> There are... in particular the get_user_try/catch mechanism, used among other 
> things by the signal handing, as well as the copy functions (I don't have the 
> original code in front of me so I don't have the context which would be 
> appropriate.)

Yes, but note that those interfaces are x86 only at the moment, so they'd have to 
be factored out and generalized before we can use it in generic code.

Thanks,

	Ingo
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