Messages in this thread | | | Date | Thu, 10 Jun 2021 20:43:45 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 01/13] objtool: Rewrite hashtable sizing |
| |
On Thu, Jun 10, 2021 at 11:14:51AM -0700, Nathan Chancellor wrote:
> This patch as commit 25cf0d8aa2a3 ("objtool: Rewrite hashtable sizing") > in -tip causes a massive compile time regression with allmodconfig + > ThinLTO.
Moo... the allyesconfig builds I used it on were much faster, but that was on regular GCC vmlinux.o after linking.
> Adding Sami because I am not sure why this patch would have much of an impact > in relation to LTO. https://git.kernel.org/tip/25cf0d8aa2a3 is the patch in > question. > > If I can provide any further information or help debug, please let me know. > > If you are interested in reproducing this locally, you will need a > fairly recent LLVM stack (I used the stable release/12.x branch) and to > cherry-pick commit 976aac5f8829 ("kcsan: Fix debugfs initcall return > type") to fix an unrelated build failure. My script [2] can build a > self-contained toolchain fairly quickly if you cannot get one from your > package manager. A command like below will speed up the build a bit:
Would something like llvm-13 from Debian be good enough?
$ clang-13 --version Debian clang version 13.0.0-++20210418105309+a0898f0cecc7-1~exp1 Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin
| |