linux-api.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Pieter Smith <pieter-qeJ+1H9vRZbz+pZb47iToQ@public.gmane.org>
To: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org,
	rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
	alexander.h.duyck-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
	viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
	ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org,
	akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
	beber-2YnHqweIUXrk1uMJSBkQmQ@public.gmane.org,
	catalina.mocanu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	dborkman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org,
	fabf-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org,
	fuse-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
	geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org,
	hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	iulia.manda21-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	JBeulich-IBi9RG/b67k@public.gmane.org,
	bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org,
	jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	mcgrof-IBi9RG/b67k@public.gmane.org,
	mattst88-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	mgorman-l3A5Bk7waGM@public.gmane.org,
	mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	Paul.Durrant-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org,
	paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org,
	pefoley2-lY0TAiDIAFlBDgjK7y7TUQ@public.gmane.org,
	tgraf-G/eBtMaohhA@public.gmane.org,
	therbert-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org,
	willemb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	xiaoguangrong-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org
Subject: Re: [PATCH v4 0/7] kernel tinification: optionally compile out splice family of syscalls (splice, vmsplice, tee and sendfile)
Date: Tue, 25 Nov 2014 21:11:29 +0100	[thread overview]
Message-ID: <20141125201129.GA27167@smipidev> (raw)
In-Reply-To: <20141125.140441.401150380839514113.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>

On Tue, Nov 25, 2014 at 02:04:41PM -0500, David Miller wrote:
> From: josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org
> Date: Tue, 25 Nov 2014 10:53:10 -0800
> 
> > It's not a "slippery slope"; it's been our standard practice for ages.
> 
> We've never put an entire class of generic system calls behind
> a config option.

I would have loved to make them optional individually, but they all are
semantic variations of the same thing: Moving data between fd's without that
data passing through userspace. It therefore isn't surprising that these
syscalls share an underlying entanglement of code (which is where the bulk of
the space saving is to be had).

What a tiny product developer should be asking himself, is: "Do I really need
to efficiently move data between file descriptors?". If the answer no, he can
disable CONFIG_SYSCALL_SPLICE to squeeze an extra 8KB out of his kernel.

  parent reply	other threads:[~2014-11-25 20:11 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-24 23:00 [PATCH v4 0/7] kernel tinification: optionally compile out splice family of syscalls (splice, vmsplice, tee and sendfile) Pieter Smith
2014-11-24 23:01 ` [PATCH v4 1/7] fs: move sendfile syscall into fs/splice Pieter Smith
2014-11-24 23:01 ` [PATCH v4 2/7] fs: moved kernel_write to fs/read_write Pieter Smith
2014-11-24 23:01 ` [PATCH v4 3/7] fs/splice: support compiling out splice-family syscalls Pieter Smith
2014-11-25  0:49   ` Josh Triplett
2014-11-24 23:01 ` [PATCH v4 4/7] fs/fuse: support compiling out splice Pieter Smith
2014-11-24 23:01 ` [PATCH v4 5/7] fs/nfsd: " Pieter Smith
     [not found] ` <1416870079-15254-1-git-send-email-pieter-qeJ+1H9vRZbz+pZb47iToQ@public.gmane.org>
2014-11-24 23:01   ` [PATCH v4 6/7] net/core: " Pieter Smith
2014-11-24 23:01 ` [PATCH v4 7/7] fs/splice: full support for " Pieter Smith
2014-11-25  0:52 ` [PATCH v4 0/7] kernel tinification: optionally compile out splice family of syscalls (splice, vmsplice, tee and sendfile) Josh Triplett
     [not found] ` <5474ABB6.3030400@infradead.org>
     [not found]   ` <5474ABB6.3030400-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2014-11-25 17:13     ` David Miller
2014-11-25 18:10       ` Paul E. McKenney
2014-11-25 18:24         ` David Miller
     [not found]           ` <20141125.132445.152609149279137368.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2014-11-25 18:58             ` Theodore Ts'o
     [not found]               ` <20141125185806.GA28116-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2014-11-25 19:05                 ` David Miller
2014-11-25 18:53       ` josh
2014-11-25 19:04         ` David Miller
     [not found]           ` <20141125.140441.401150380839514113.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2014-11-25 19:16             ` Eric W. Biederman
     [not found]               ` <87egsr9jkz.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2014-11-25 19:27                 ` David Miller
     [not found]                   ` <20141125.142741.1620673255148724338.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2014-11-25 20:01                     ` Eric W. Biederman
2014-11-25 20:11             ` Pieter Smith [this message]
2014-11-26 12:19           ` One Thousand Gnomes
2014-11-25 19:00     ` josh-iaAMLnmF4UmaiuxdJuQwMA
2014-11-25 22:08     ` josh-iaAMLnmF4UmaiuxdJuQwMA

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20141125201129.GA27167@smipidev \
    --to=pieter-qej+1h9vrzbz+pzb47itoq@public.gmane.org \
    --cc=JBeulich-IBi9RG/b67k@public.gmane.org \
    --cc=Paul.Durrant-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org \
    --cc=akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org \
    --cc=alexander.h.duyck-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
    --cc=ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org \
    --cc=beber-2YnHqweIUXrk1uMJSBkQmQ@public.gmane.org \
    --cc=bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org \
    --cc=catalina.mocanu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
    --cc=davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org \
    --cc=dborkman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
    --cc=ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org \
    --cc=edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
    --cc=fabf-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org \
    --cc=fuse-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org \
    --cc=geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org \
    --cc=hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
    --cc=iulia.manda21-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
    --cc=jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org \
    --cc=josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org \
    --cc=linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=mattst88-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
    --cc=mcgrof-IBi9RG/b67k@public.gmane.org \
    --cc=mgorman-l3A5Bk7waGM@public.gmane.org \
    --cc=miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org \
    --cc=mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
    --cc=netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
    --cc=paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org \
    --cc=pefoley2-lY0TAiDIAFlBDgjK7y7TUQ@public.gmane.org \
    --cc=rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org \
    --cc=tgraf-G/eBtMaohhA@public.gmane.org \
    --cc=therbert-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
    --cc=trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org \
    --cc=viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org \
    --cc=willemb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
    --cc=xiaoguangrong-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).