[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20080306111408.GM13391@elte.hu>
Date: Thu, 6 Mar 2008 12:14:08 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Andi Kleen <ak@...e.de>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
kernel list <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.25-rc3: 34TB vmalloc total -- overflow in /proc/meminfo?
* Andi Kleen <ak@...e.de> wrote:
> Just commenting on the subject. The 34TB are not an over/underflow.
> x86-64 simply has so much address space reserved for vmalloc. It
> doesn't mean of course that that much could be actually allocated in
> real memory.
btw., the exact amount of available vmalloc space on 64-bit x86 is 32 TB
(32768 GB), or 0x0000200000000000 hexa. (this is still only 0.0002% of
the complete 64-bit address space [25% of the 128 TB 64-bit kernel
address space] so we've got plenty of room)
but the first fundamental limit we'll hit on 64-bit is the 32-bit offset
limit of binaries - this affects kernel modules, the kernel image, etc.
We wont hit that anytime soon, but we'll eventually hit it. (user-space
will be the first i guess)
Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists