From: "Prasad Joshi" <prasadjoshi124@gmail.com>
To: vivekutal@gmail.com
Cc: Rick Brown <rick.brown.3@gmail.com>,
kernelnewbies <kernelnewbies@nl.linux.org>,
linux-newbie@vger.kernel.org
Subject: Re: need for 3G/1G split
Date: Thu, 22 Mar 2007 11:11:38 +0530 [thread overview]
Message-ID: <fe291c8c0703212241o7d6909aj3acca12da7294260@mail.gmail.com> (raw)
In-Reply-To: <1174473501.9500.12.camel@localhost>
3/21/07, Vivek <vivekutal@gmail.com> wrote:
> > Why is kernel restricted to use virtual addresses of only 1 GB? Or
> > what is the need to split up the virtual address space into user
> > addresses and kernel addresses?
>
> We can have 4GB for kernel and 4GB for userspace but this has a overhead
> of flushing of tlb for every syscall.
> You can also make the split 2/2GB but this has a problem of having less
> user address space.
> 3/1 is a better choice.
Does TLB size change 4, 3, or 2 GB virtual addresses are used? I
though it would be same irrespective of whether virtual addresses are
4 or 1 GB.
If the TLB size is at all same for any number of virtual addresses
then what difference it make while flushing the TLB?
>
> --
> Vivek Kutal
>
>
>
> --
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next prev parent reply other threads:[~2007-03-22 5:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-21 4:15 need for 3G/1G split Rick Brown
2007-03-21 10:38 ` Vivek
2007-03-22 5:41 ` Sandeep Kumar
2007-03-22 5:41 ` Prasad Joshi [this message]
2007-03-22 6:35 ` Rajat Jain
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