linux-kernel - Re: [RFC][PATCH] Cross Memory Attach

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Message-ID: <AANLkTi=rmUUPCm212Sju-wW==5cT4eqqU+FEP_hX-Z_y@mail.gmail.com>
Date:	Wed, 15 Sep 2010 23:46:09 +0900
From:	Bryan Donlan <bdonlan@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Christopher Yeoh <cyeoh@....ibm.com>, linux-kernel@...r.kernel.org,
	Linux Memory Management List <linux-mm@...ck.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC][PATCH] Cross Memory Attach

On Wed, Sep 15, 2010 at 19:58, Avi Kivity <avi@...hat.com> wrote:

> Instead of those two syscalls, how about a vmfd(pid_t pid, ulong start,
> ulong len) system call which returns an file descriptor that represents a
> portion of the process address space.  You can then use preadv() and
> pwritev() to copy memory, and io_submit(IO_CMD_PREADV) and
> io_submit(IO_CMD_PWRITEV) for asynchronous variants (especially useful with
> a dma engine, since that adds latency).
>
> With some care (and use of mmu_notifiers) you can even mmap() your vmfd and
> access remote process memory directly.

Rather than introducing a new vmfd() API for this, why not just add
implementations for these more efficient operations to the existing
/proc/$pid/mem interface?
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