linux-kernel - [PATCH 0/6] timers/migration: Fix NUMA trees + cleanups

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>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251024132536.39841-1-frederic@kernel.org>
Date: Fri, 24 Oct 2025 15:25:30 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>
Subject: [PATCH 0/6] timers/migration: Fix NUMA trees + cleanups

Hi,

A while ago I found out that NUMA tree layout had flaws but I thought it
was only about rare setups. Having had a closer look while thinking
about the big.LITTLE handling, I realized the NUMA timer tree are
actually imbalanced in many cases, except perhaps when 0-7 CPUs are lucky
enough to belong to the same node, and yet up to a certain amount of
CPUs.

Here is a fix proposal, plus a bunch of cleanups.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/core

HEAD: 4adecc004d35dbe8a48df3d23ed2b8cf42772716
Thanks,
	Frederic
---

Frederic Weisbecker (6):
      timers/migration: Convert "while" loops to use "for"
      timers/migration: Remove locking on group connection
      timers/migration: Fix imbalanced NUMA trees
      timers/migration: Assert that hotplug preparing CPU is part of stable active hierarchy
      timers/migration: Remove unused "cpu" parameter from tmigr_get_group()
      timers/migration: Remove dead code handling idle CPU checking for remote timers

 kernel/time/timer_migration.c | 279 ++++++++++++++++++++++--------------------
 1 file changed, 143 insertions(+), 136 deletions(-)