Kernel memory management problem

[Valery Reznic]

--- On Mon, 3/2/09, Alexander Indenbaum <alexander.indenbaum at gmail.com> wrote:

> From: Alexander Indenbaum <alexander.indenbaum at gmail.com>
> Subject: Re: Kernel memory management problem
> To: "guy keren" <choo at actcom.co.il>
> Cc: "linux-il." <linux-il at cs.huji.ac.il>
> Date: Monday, March 2, 2009, 4:24 PM
> On Mon, Mar 2, 2009 at 1:16 PM, guy keren
> <choo at actcom.co.il> wrote:
> >
> > if you don't care about the speed of copying the
> data and of slowing down
> > the disk media consderably during this copying, try to
> change the copy
> > program, so it will use the O_DIRECT flag when opening
> the file (and then
> > you'll need to make sure the buffers you pass to
> write() are aligned to disk
> > sector size, as well as being in disk sector size
> multiples). this way,
> > you'll bypass the buffer cache altogether.
> >
> > maybe someone else will come up with a better
> response.
> >
> 
> choo, nice to chat with you again. Still have an appetite
> to red heads :) ?
> 
> Thank you for your answer.
> 
> While O_DIRECT is a valid way and probably will solve the
> problem of
> crashing, I would not want to patch wget/sftp/whatever. The
> list is
> long, I have better things to do mean while, instead of
> burning in
Patching every single program is not nessesary.
You can use LD_PRELOAD mechanism to add O_DIRECT to each open
function call in each program (ok - to each dynamically linked program)