On Sat, Mar 13, 2021 at 9:51 AM Borislav Petkov <b...@alien8.de> wrote: > > On Sat, Mar 13, 2021 at 06:26:15AM +0100, Sedat Dilek wrote: > > x86/jump_label: Mark arguments as const to satisfy asm constraints > > Where do I find this patch? >
Here we go: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/patch/?id=864b435514b286c0be2a38a02f487aa28d990ef8 > > x86: Remove dynamic NOP selection > > objtool,x86: Use asm/nops.h > > > > My benchmark was to build a Linux-kernel with LLVM/Clang v12.0.0-rc3 > > on Debian/testing AMD64. > > > > Patchset applied for a first build: > > > > Performance counter stats for 'make V=1 -j4 LLVM=1 LLVM_IAS=1 > > PAHOLE=/opt/pahole/bin/pahole LOCALVERSION=-7-amd64-clang12-cfi > > KBUILD_VERBOSE=1 KBUILD_BUILD_HOST=iniza > > There's a reason I have -s for silent in the build - printing output > during the build creates a *lot* of variance. And you have excessive > printing with V=1 and KBUILD_VERBOSE=1. > > Also, you need to repeat those workloads a couple of times - one is not > enough. That's why I have --repeat 5 in there. > > Also, you need --pre=/root/bin/pre-build-kernel.sh where that script is: > > --- > #!/bin/bash > echo $0 > > make -s clean > echo 3 > /proc/sys/vm/drop_caches > --- > > so that you can avoid pagecache influence. > OK, I see. - Sedat - > Lemme rerun here with clang. > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette
