linux-kernel - Re: [PATCH] mm readahead: Fix sys_readahead breakage by reverting 2MB limit (bug 79111)

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Message-ID: <53B5A26B.7040606@linux.vnet.ibm.com>
Date:	Fri, 04 Jul 2014 00:05:23 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Damien Ramonda <damien.ramonda@...el.com>,
	Jan Kara <jack@...e.cz>, David Rientjes <rientjes@...gle.com>,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm readahead: Fix sys_readahead breakage by reverting
 2MB limit (bug 79111)

On 07/03/2014 11:52 PM, Linus Torvalds wrote:
> On Thu, Jul 3, 2014 at 11:11 AM, Raghavendra K T
> <raghavendra.kt@...ux.vnet.ibm.com> wrote:
>>>
>>> If this comes from some man-page,
>>
>> Yes it is.
>
> Ok, googling actually finds a fairly recent patch to fix it
>
>     http://www.spinics.net/lists/linux-mm/msg70517.html
>
> and several much older "that's not true" comments.

Thanks. I had missed that.

>
> That said, the bugzilla entry you mentioned does mention "can't boot
> 3.14 now". I'm not sure what the meaning of that sentence is, though.
> Does it mean "can't boot 3.14 to test it because the machine is busy",
> or is it a typo and really meant 3.15, and that some bootup script
> *depended* on readahead()? I don't know. It seems strange.

I think your guess is right, it meant to say "I can't boot it anymore
since I already upgraded to 3.15", because eventually bootup script (if
it is) should have to read IIUC.


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