linux-kernel - [PATCH V2 0/4] posix-timers: Reduce spinlock contention

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Message-ID: <20250219125522.2535263-1-edumazet@google.com>
Date: Wed, 19 Feb 2025 12:55:18 +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 V2 0/4] posix-timers: Reduce spinlock contention

We had incidents involving gazillions of concurrent posix timers.

In this series, I am reducing hash_lock contention in posix_timer_add(),
and fix a possible race.

v2: Initialize timer->it_id and timer->it_signal to non zero values
v1: https://lore.kernel.org/lkml/20250214135911.2037402-1-edumazet@google.com/

Eric Dumazet (4):
  posix-timers: Make next_posix_timer_id an atomic_t
  posix-timers: Initialise timer->it_id in posix_timer_add()
  posix-timers: Initialise timer->it_signal in posix_timer_add()
  posix-timers: Use RCU in posix_timer_add()

 include/linux/sched/signal.h |  2 +-
 kernel/time/posix-timers.c   | 54 ++++++++++++++++++++++++++----------
 2 files changed, 41 insertions(+), 15 deletions(-)

-- 
2.48.1.601.g30ceb7b040-goog