linux-kernel - Re: Cross Memory Attach v4

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Message-ID: <CAM9Y=f4p6Ch4u88K3eykoL_GjNiitJnD_OSOexKGBuXC58x_tQ@mail.gmail.com>
Date:	Mon, 1 Aug 2011 10:06:31 +0800
From:	Daniel J Blueman <daniel.blueman@...il.com>
To:	Christopher Yeoh <cyeoh@....ibm.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Cross Memory Attach v4

On Jul 27, 11:30 am, Christopher Yeoh <cyeoh@....ibm.com> wrote:
> Hi Andrew,
>
> Here's an updated version of the Cross Memory Attach patch. Changes
> since the v3:
>
> - Adds x86_64 specific wire up
> - Changes behaviour so process_vm_readv and process_vm_writev return
>   the number of bytes successfully read or written even if an error
>   occurs
> - Adds more kernel doc interface comments
> - rename of some internal functions (process_vm_rw_check_iovecs,
>   process_vm_rw) so they make more sense.
>
> Still need to do benchmarking to see if the optimisation for small
> copies using a local on-stack array in process_vm_rw_core is worth it.
[]

A bit late to the party.

get_user_pages_fast may be a nice win here, since the pages will
almost always be present; it'll backoff to the locked get_user_pages
path to handle the pathological case of swapped pages.

Thanks,
  Daniel
-- 
Daniel J Blueman
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