linux-kernel - Re: [PATCH] [RFC] vm: add a syscall to map a process memory into a pipe

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Message-ID: <20171101174712.GA26700@outlook.office365.com>
Date:   Wed, 1 Nov 2017 10:47:13 -0700
From:   Andrei Vagin <avagin@...tuozzo.com>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     Andrei Vagin <avagin@...nvz.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>, criu@...nvz.org,
        Arnd Bergmann <arnd@...db.de>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>
Subject: Re: [PATCH] [RFC] vm: add a syscall to map a process memory into a
 pipe

Hi Michael,

On Mon, Oct 30, 2017 at 01:47:31PM +0100, Michael Kerrisk (man-pages) wrote:
> On 10 August 2017 at 20:46, Andrei Vagin <avagin@...nvz.org> wrote:
> > It is a hybrid of process_vm_readv() and vmsplice().
> >
> > vmsplice can map memory from a current address space into a pipe.
> > process_vm_readv can read memory of another process.
> >
> > A new system call can map memory of another process into a pipe.
> >
> > ssize_t process_vmsplice(pid_t pid, int fd, const struct iovec *iov,
> >                         unsigned long nr_segs, unsigned int flags)
> >
> > All arguments are identical with vmsplice except pid which specifies a
> > target process.
> 
> Can we have a man page for this new syscall please?

I think we can add a description for process_vmsplice into
man2/vmsplice.2. The patch is attached.

Thanks,
Andrei

> 
> Thanks,
> 
> Michael
> 
> 

View attachment "0001-vmsplice.2-add-description-for-process_vmsplice.patch" of type "text/plain" (1971 bytes)