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

[Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>]

On 07/03/2014 11:59 PM, Linus Torvalds wrote:
> On Thu, Jul 3, 2014 at 11:22 AM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>>
>> So the bugzilla entry worries me a bit - we definitely do not want to
>> regress in case somebody really relied on timing - but without more
>> specific information I still think the real bug is just in the
>> man-page.
>
> Side note: the 2MB limit may be too small. 2M is peanuts on modern
> machines, even for fairly slow IO, and there are lots of files (like
> glibc etc) that people might want to read-ahead during boot. We
> already do bigger read-ahead if people just do "read()" system calls.
> So I could certainly imagine that we should increase it.
>
> I do *not* think we should bow down to insane man-pages that have
> always been wrong, though, and I don't think we should increase it to
> "let's just read-ahead a whole ISO image" kind of sizes..

Okay, how about something like 256MB? I would be happy to send a patch
for that change.

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