Messages in this thread |  | | Date | Sun, 02 Dec 2001 17:44:17 +0100 | From | Martin Dalecki <> | Subject | Re: PATCH 2.4.17.2: make ext2 smaller |
| |
Jeff Garzik wrote: > > I do not plan to submit this patch to Linus/Marcelo. > > This patch applies an obvious technique to the kernel: increase the > amount of code compiled in a single compilation unit, to increase the > overall knowledge the compiler has of the code, to allow for better > optimization and dead code removal. KDE does this, with definite > success, though they definitely are not the first to do this. > > Simply, all ext2 files are #include'd into a single file, ext2_all.c, > and all functions and data structures are declared static. > > This technique can be used in the kernel, userspace applications, and > userspace libraries to decrease icache footprint and overall size of > your applications. > > Results from 2.4.17-pre2 plus the attached patch: 1135 bytes saved in > vmlinux, simply from making all the functions static. > (*.orig is prior to my patch. kernel is P2 SMP-based) > > [jgarzik@rum linux-e2all]$ ls -l vmlinux* arch/i386/boot/bzImage* > > -rw-r--r-- 1 jgarzik jgarzik 1030259 Dec 2 06:18 arch/i386/boot/bzImage > > -rw-r--r-- 1 jgarzik jgarzik 1030263 Dec 2 06:04 arch/i386/boot/bzImage.orig > > -rwxr-xr-x 1 jgarzik jgarzik 2814631 Dec 2 06:18 vmlinux* > > -rwxr-xr-x 1 jgarzik jgarzik 2815766 Dec 2 06:04 vmlinux.orig* r
size vmlinux and size vmlinux.orig
would be a bit more telling whatever the reaons of the impact is. - 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/
|  |