From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Fengguang Wu <fengguang.wu@intel.com>,
David Cohen <david.a.cohen@linux.intel.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Damien Ramonda <damien.ramonda@intel.com>,
Jan Kara <jack@suse.cz>, David Rientjes <rientjes@google.com>,
Nishanth Aravamudan <nacc@linux.vnet.ibm.com>,
linux-mm <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm readahead: Fix sys_readahead breakage by reverting 2MB limit (bug 79111)
Date: Fri, 04 Jul 2014 00:08:59 +0530 [thread overview]
Message-ID: <53B5A343.4090402@linux.vnet.ibm.com> (raw)
In-Reply-To: <CA+55aFwwSCrH5QDvrzzyHhRU5R849Mo8A3NdRMwm9OTeWH9diQ@mail.gmail.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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next prev parent reply other threads:[~2014-07-03 18:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-03 13:02 [PATCH] mm readahead: Fix sys_readahead breakage by reverting 2MB limit (bug 79111) Raghavendra K T
2014-07-03 15:41 ` Linus Torvalds
2014-07-03 18:11 ` Raghavendra K T
2014-07-03 18:22 ` Linus Torvalds
2014-07-03 18:29 ` Linus Torvalds
2014-07-03 18:38 ` Raghavendra K T [this message]
2014-07-03 18:50 ` Raghavendra K T
2014-07-03 18:53 ` Linus Torvalds
2014-07-03 18:56 ` Raghavendra K T
2014-07-03 19:05 ` Dave Jones
2014-07-03 19:43 ` John Stoffel
2014-07-03 21:58 ` Linus Torvalds
2014-10-03 20:57 ` Rafael Aquini
2014-07-03 18:35 ` Raghavendra K T
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