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From: "Randy.Dunlap" <rddunlap@osdl.org>
To: "David S. Miller" <davem@redhat.com>
Cc: root@chaos.analogic.com, bernie@develer.com,
	uclinux-dev@uclinux.org, linux-kernel@vger.kernel.org
Subject: Re: Kernel 2.6 size increase
Date: Wed, 23 Jul 2003 14:47:19 -0700	[thread overview]
Message-ID: <20030723144719.103adc19.rddunlap@osdl.org> (raw)
In-Reply-To: <20030723130712.6ac59b56.davem@redhat.com>

On Wed, 23 Jul 2003 13:07:12 -0700 "David S. Miller" <davem@redhat.com> wrote:

| On Wed, 23 Jul 2003 15:14:22 -0400 (EDT)
| "Richard B. Johnson" <root@chaos.analogic.com> wrote:
| 
| > On Wed, 23 Jul 2003, Bernardo Innocenti wrote:
| > It looks like a lot of data may have been initialized in the
| > newer kernel, i.e. int barf = 0; or struct vomit = {0,}.
| > If they just declared the static data, it would end up in
| > .bss which is allocated at run-time (and zeroed) and is
| > not in the kernel image.
| 
| GCC 3.3 and later do this automatically.
| 
| It's weird, since we killed TONS of explicit zero initializers during
| 2.5.x, you'd be pressed to find many examples like the one you
| mention.
| 
| Another thing is that the define_per_cpu() stuff eliminated many huge
| [NR_CPUS] arrays.  But this probably doesn't apply to his kernel
| unless he built is with SMP enabled.

Yes, lots were already killed off, but there are also several
kernel-janitor patches to remove many more static 0 inits.
They can be found at
  http://developer.osdl.org/ogasawara/kj-patches/uninit_static/
and I'll be trying to have them merged, although I don't know
how well they will be accepted.

--
~Randy

  reply	other threads:[~2003-07-23 21:35 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-23 18:46 Bernardo Innocenti
2003-07-23 19:14 ` Richard B. Johnson
2003-07-23 20:07   ` David S. Miller
2003-07-23 21:47     ` Randy.Dunlap [this message]
2003-07-23 19:32 ` [uClinux-dev] " Christoph Hellwig
2003-07-23 20:11   ` David S. Miller
2003-07-23 20:15     ` Christoph Hellwig
2003-07-23 20:22       ` David S. Miller
2003-07-23 20:27         ` Christoph Hellwig
2003-07-23 22:35           ` [uClinux-dev] Kernel 2.6 size increase - get_current()? Bernardo Innocenti
2003-07-23 22:37             ` Alan Cox
2003-07-23 23:00               ` Bernardo Innocenti
2003-07-24  5:06                 ` David McCullough
2003-07-24 11:28                   ` Alan Cox
2003-07-24 12:04                     ` David McCullough
2003-07-24 14:48                       ` Alan Cox
2003-07-25 18:25                       ` bill davidsen
2003-07-24 15:30                     ` Hollis Blanchard
2003-07-24 19:37                       ` Alan Cox
2003-07-24 19:51                         ` Hollis Blanchard
2003-07-24 21:20                           ` J.A. Magallon
2003-07-25  4:22                             ` Otto Solares
2003-07-25 14:38                               ` Hollis Blanchard
2003-07-28  3:19                                 ` Miles Bader
2003-07-28  8:14                                   ` Ihar "Philips" Filipau
2003-07-28  8:58                                     ` Miles Bader
2003-07-28  9:03                                       ` Ihar "Philips" Filipau
2003-07-23 21:57   ` [uClinux-dev] Kernel 2.6 size increase Bernardo Innocenti
2003-07-23 22:07     ` Bernardo Innocenti
2003-07-23 22:27       ` Willy Tarreau
2003-07-23 22:34         ` Alan Cox
2003-07-24 20:27         ` Bernardo Innocenti
2003-07-25 15:46           ` Christoph Hellwig
2003-07-25 23:55             ` [PATCH] Make I/O schedulers optional (Was: Re: Kernel 2.6 size increase) Bernardo Innocenti
2003-07-26  8:17               ` Andrew Morton
2003-07-26 12:40                 ` Bernardo Innocenti
2003-07-26 14:07                   ` Jens Axboe
2003-07-26 23:42                     ` Bernardo Innocenti
2003-07-26 23:41                       ` Jens Axboe
2003-07-28 17:13             ` [uClinux-dev] Kernel 2.6 size increase Nicolas Pitre
2003-07-28 23:02               ` Bernardo Innocenti
2003-07-29  2:36                 ` Miles Bader
2003-08-08 13:25                 ` [uClinux-dev] " David Woodhouse
2003-08-08 14:37                   ` Bernardo Innocenti
2003-08-08 14:43                     ` David Woodhouse
2003-07-25 18:16           ` bill davidsen
2003-07-29 22:29           ` Tom Rini
2003-07-29 22:48             ` Alan Cox
2003-07-29 23:06               ` Tom Rini
2003-07-30  2:07                 ` Miles Bader
2003-07-30 15:33                   ` Tom Rini
2003-07-31  1:49                     ` Miles Bader
2003-07-31  4:17                       ` Tom Rini
2003-07-31  5:03                         ` Miles Bader
2003-07-31 15:24                           ` Tom Rini
2003-07-30  2:49             ` [uClinux-dev] " Bernardo Innocenti
2003-07-30 15:35               ` Tom Rini
2003-07-30 16:45                 ` [uClinux-dev] Kernel 2.6 size increase (PATCH) Bernardo Innocenti
     [not found] <cArb.74D.1@gated-at.bofh.it>
     [not found] ` <cUTh.6JZ.33@gated-at.bofh.it>
     [not found]   ` <eLiy.31J.3@gated-at.bofh.it>
     [not found]     ` <eLBW.3eJ.7@gated-at.bofh.it>
     [not found]       ` <eLVb.3yF.1@gated-at.bofh.it>
     [not found]         ` <eOJn.5NI.1@gated-at.bofh.it>
     [not found]           ` <f1dJ.GS.21@gated-at.bofh.it>
     [not found]             ` <faTE.2LQ.3@gated-at.bofh.it>
     [not found]               ` <fd56.4Te.9@gated-at.bofh.it>
     [not found]                 ` <fdRv.5uB.9@gated-at.bofh.it>
     [not found]                   ` <fnHd.54o.19@gated-at.bofh.it>
2003-07-31 16:31                     ` Kernel 2.6 size increase Ihar "Philips" Filipau
2003-07-31 16:43                       ` Tom Rini
2003-07-31 17:04                         ` Ihar "Philips" Filipau
2003-07-31 17:20                           ` Tom Rini
2003-07-31 18:02                             ` Ihar "Philips" Filipau

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