On Monday 10 September 2007 20:14, Sam Ravnborg wrote: > On Mon, Sep 10, 2007 at 08:02:15PM +0100, Denys Vlasenko wrote: > > On Monday 10 September 2007 13:01, Sam Ravnborg wrote: > > > > > > > > > Doing a normal kernel build will link vmlinux three or four times. > > > > > If we introduce --gc-sections we should add a preparational link of > > > > > vmlinux where we use --gc-sections and skip it for the rest of the > > > > > links > > > > > assuming that --gc-sections takes some time for ld to do. > > > > > > > > Yes, this will speed up things a bit. > > > > > > If we do the --gc-sections trick during the preparational link then we do > > > not use the arch supplied linker script. > > > Will it be possible to create a dedicated linker script that is valid > > > for all architectures and which only include the KEEP() directives for > > > the diverse sections? > > > > Unfortunately, -r and --gc-sections don't mix. > > > > x86_64-pc-linux-gnu-ld: --gc-sections and -r may not be used together > > OK - so much for that optimization :-( > > But then we need to annotate ALL arch linker script before introducing this. > And that bring me back to that we should put some sanity into these first.
I was working with x86_64 ld script and am willing to clean it up a bit. I can impelment and test DISCARD_UNUSED_SECTIONS for x86_64 and later for i386. Other arches can follow when they find it interesting/worthwhile. At first, big scary warning under "config DISCARD_UNUSED_SECTIONS" should be enough to make people avoid it for production boxes, I hope. Should I send next round of patches to you or to Andrew? -- vda - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
