linux-kernel - Compilation time increase with this commit when enabling DEBUG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID:
 <ZQZPR01MB097928D272E733B32A81049F8A7CA@ZQZPR01MB0979.CHNPR01.prod.partner.outlook.cn>
Date: Wed, 31 Jan 2024 16:48:00 +0000
From: Leyfoon Tan <leyfoon.tan@...rfivetech.com>
To: "surenb@...gle.com" <surenb@...gle.com>, "akpm@...ux-foundation.org"
	<akpm@...ux-foundation.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Compilation time increase with this commit when enabling DEBUG_INFO

After the commit "fork: lock VMAs of the parent process when forking" in [1], the compilation time increases from ~2 minutes to 8.5 minutes when enabling CONFIG_DEBUG_INFO* (CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT/CONFIG_DEBUG_INFO_DWARF4/CONFIG_DEBUG_INFO_DWARF5).
Looking at the commit changes, not sure why it causes the increase in compilation time. Any ideas?

From:

# time make -j
real    1m51.522s
user    59m55.836s
sys     5m29.177s

Increase to:

# time make -j
real    8m31.967s
user    69m24.410s
sys     5m54.588s

Note, compile time above with ARCH=riscv, defconfig + CONFIG_DEBUG_INFO_DWARF4.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b4f3b4987b56365b981f44a7e843efa5b6619b9