From: "H. Peter Anvin" <hpa@zytor.com>
To: Jakub Jelinek <jakub@redhat.com>
Cc: Jan Hubicka <hubicka@ucw.cz>, "H.J. Lu" <hjl.tools@gmail.com>,
Jan Beulich <JBeulich@novell.com>,
GCC Development <gcc@gcc.gnu.org>,
x32-abi@googlegroups.com,
Binutils <binutils@sourceware.org>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: x32 psABI draft version 0.2
Date: Thu, 17 Feb 2011 19:56:00 -0000 [thread overview]
Message-ID: <4D5D7D6E.4080307@zytor.com> (raw)
In-Reply-To: <20110217180646.GB30899@tyan-ft48-01.lab.bos.redhat.com>
On 02/17/2011 10:06 AM, Jakub Jelinek wrote:
> On Thu, Feb 17, 2011 at 04:44:53PM +0100, Jan Hubicka wrote:
>>>> According to Mozilla folks however REL+RELA scheme used by EABI leads
>>>> to significandly smaller libxul.so size
>>>>
>>>> According to http://glandium.org/blog/?p=1177 the difference is about 4-5MB
>>>> (out of approximately 20-30MB shared lib)
>>>
>>> This is orthogonal to x32 psABI.
>>
>> Understood. I am just pointing out that x86-64 Mozilla suffers from startup
>> problems (extra 5MB of disk read needed) compared to both x86 and ARM EABI
>> because x86-64 ABI is RELA only. If x86-64 ABI was REL+RELA like EABI is, we
>> would not have this problem here.
>
> libxul.so has < 200000 relocs, so 5MB is total size of .rela section in
> 64-bit ELF, you don't magically save those 5MB by using REL. You save
> just 1.5MB. And for x32 we'd be talking about 2.5MB for RELA vs. 1.6MB for
> REL. There might be better ways how to get the numbers down.
>
The size is, of course, half of that for the x32 ABI in the first place.
-hpa
next prev parent reply other threads:[~2011-02-17 19:56 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-16 19:22 H.J. Lu
2011-02-16 20:04 ` H. Peter Anvin
2011-02-16 20:29 ` Roland McGrath
2011-02-16 20:35 ` Chris Metcalf
2011-02-16 20:39 ` Andrew Pinski
2011-02-16 20:46 ` H.J. Lu
2011-02-16 22:13 ` Chris Metcalf
2011-02-17 8:35 ` Jan Beulich
2011-02-17 12:14 ` H.J. Lu
2011-02-17 16:14 ` John Reiser
2011-02-17 17:59 ` Jakub Jelinek
2011-02-17 14:29 ` Jakub Jelinek
2011-02-17 15:22 ` Jan Hubicka
2011-02-17 15:30 ` H.J. Lu
2011-02-17 15:45 ` Jan Hubicka
2011-02-17 15:49 ` H.J. Lu
2011-02-17 16:10 ` Jan Beulich
2011-02-17 17:59 ` H.J. Lu
2011-02-18 8:10 ` Jan Beulich
2011-02-18 17:53 ` H.J. Lu
2011-02-18 20:32 ` Jan Hubicka
2011-02-21 8:04 ` Jan Beulich
2011-02-17 18:07 ` Jakub Jelinek
2011-02-17 19:56 ` H. Peter Anvin [this message]
2011-02-17 22:50 ` Jan Hubicka
2011-02-17 23:00 ` H. Peter Anvin
2011-02-17 23:07 ` Jakub Jelinek
2011-02-18 8:49 ` Jan Beulich
2011-02-17 18:14 ` Joseph S. Myers
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=4D5D7D6E.4080307@zytor.com \
--to=hpa@zytor.com \
--cc=JBeulich@novell.com \
--cc=binutils@sourceware.org \
--cc=gcc@gcc.gnu.org \
--cc=hjl.tools@gmail.com \
--cc=hubicka@ucw.cz \
--cc=jakub@redhat.com \
--cc=libc-alpha@sourceware.org \
--cc=x32-abi@googlegroups.com \
/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 read-only IMAP folder(s) and NNTP newsgroup(s).