linux-kernel - [PATCH 0/2] posix-timers: Reduce spinlock contention

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Message-ID: <20250214135911.2037402-1-edumazet@google.com>
Date: Fri, 14 Feb 2025 13:59:09 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: Anna-Maria Behnsen <anna-maria@...utronix.de>, Frederic Weisbecker <frederic@...nel.org>, 
	Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, Benjamin Segall <bsegall@...gle.com>, 
	Eric Dumazet <eric.dumazet@...il.com>, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH 0/2] posix-timers: Reduce spinlock contention

We had incidents involving gazillions of concurrent posix timers.

Benjamin Segall is planning to add a cond_resched() in exit_itimers()

In this small series, I am reducing hash_lock contention in posix_timer_add()

Eric Dumazet (2):
  posix-timers: Make next_posix_timer_id an atomic_t
  posix-timers: Use RCU in posix_timer_add()

 include/linux/sched/signal.h |  2 +-
 kernel/time/posix-timers.c   | 21 +++++++++++++++++----
 2 files changed, 18 insertions(+), 5 deletions(-)

-- 
2.48.1.601.g30ceb7b040-goog