Messages in this thread | | | From | johan.adolfsson@axis ... | Subject | Re: List of all-zero .data variables in linux-2.4.3 available | Date | Thu, 12 Apr 2001 16:44:48 +0200 |
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Shouldn't a compiler be able to deal with this instead? (Just a thought.) /Johan
----- Original Message ----- From: Adam J. Richter <adam@yggdrasil.com> To: <linux-kernel@vger.kernel.org> Sent: Thursday, April 12, 2001 2:36 PM Subject: List of all-zero .data variables in linux-2.4.3 available
> For anyone who is interested, I have produced a list of all > of the .data variables that contain all zeroes and could be moved to > .bss within the kernel and all of the modules (all of the modules > that we build at Yggdrasil for x86, which is almost all). These > are global or static variables that have been declared > > int foo = 0; > > instead of > > int foo; /* = 0 */ > > The result is that the .o files are bigger than they have > to be. The kernel memory image is not bigger, and gzip shrinks the > runs of zeroes down to almost nothing, so it does not have a huge effect > on bootable disks. Still, it would be nice to save the disk space of > the approximately 75 kilobytes of zeroes and perhaps squeeze in another > sector or two when building boot floppies. > > I have also included a copy of the program that I wrote to > find these all-zero .data variables. > > The program and the output are FTPable from > ftp://ftp.yggdrasil.com/private/adam/linux/zerovars/. Files with no > all-zero .data variables are not included in the listing. If you maintain > any code in the kernel, you might want to look at the output to see > how your code stacks up. > > Adam J. Richter __ ______________ 4880 Stevens Creek Blvd, Suite 104 > adam@yggdrasil.com \ / San Jose, California 95129-1034 > +1 408 261-6630 | g g d r a s i l United States of America > fax +1 408 261-6631 "Free Software For The Rest Of Us." > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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