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From: Frederic Weisbecker <frederic@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Frederic Weisbecker <frederic@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	Oleg Nesterov <oleg@redhat.com>, Ingo Molnar <mingo@kernel.org>
Subject: [PATCH 0/6] posix-cpu-timers: Bunch of fixes
Date: Fri,  4 Jun 2021 13:31:53 +0200	[thread overview]
Message-ID: <20210604113159.26177-1-frederic@kernel.org> (raw)

The first is a race due to locklessly starting process wide cputime
counting.

The others stop the process wide cputime counting and tick dependency
when they are not necessary anymore.

Note I don't really like patch 5/6 and in fact I hope we could manage to
remove this early inline cpu_timer_fire() call from timer_settime(). All
we get from it is headaches. Besides, the handler isn't invoked from the
actual target and that doesn't sound ideal.

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

HEAD: f8f908c9d2b2f1e100cd549206c95a4e65e5f023

Thanks,
	Frederic
---

Frederic Weisbecker (6):
      posix-cpu-timers: Fix rearm racing against process tick
      posix-cpu-timers: Don't start process wide cputime counter if timer is disabled
      posix-cpu-timers: Force next_expiration recalc after timer deletion
      posix-cpu-timers: Force next_expiration recalc after timer reset
      posix-cpu-timers: Force next expiration recalc after early timer firing
      posix-cpu-timers: Force next expiration recalc after itimer reset


 include/linux/posix-timers.h   | 11 ++++-
 kernel/time/posix-cpu-timers.c | 97 +++++++++++++++++++++++++++++++++---------
 2 files changed, 87 insertions(+), 21 deletions(-)

             reply	other threads:[~2021-06-04 11:32 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 11:31 Frederic Weisbecker [this message]
2021-06-04 11:31 ` [PATCH 1/6] posix-cpu-timers: Fix rearm racing against process tick Frederic Weisbecker
2021-06-09 11:54   ` Frederic Weisbecker
2021-06-11 11:49     ` Peter Zijlstra
2021-06-11 12:37       ` Frederic Weisbecker
2021-06-04 11:31 ` [PATCH 2/6] posix-cpu-timers: Don't start process wide cputime counter if timer is disabled Frederic Weisbecker
2021-06-09 12:18   ` Frederic Weisbecker
2021-06-10 10:24     ` Frederic Weisbecker
2021-06-16  8:51   ` Peter Zijlstra
2021-06-16 10:51     ` Frederic Weisbecker
2021-06-16 11:26       ` Peter Zijlstra
2021-06-16 11:50         ` Peter Zijlstra
2021-06-04 11:31 ` [PATCH 3/6] posix-cpu-timers: Force next_expiration recalc after timer deletion Frederic Weisbecker
2021-06-16  9:16   ` Peter Zijlstra
2021-06-04 11:31 ` [PATCH 4/6] posix-cpu-timers: Force next_expiration recalc after timer reset Frederic Weisbecker
2021-06-16  9:23   ` Peter Zijlstra
2021-06-16 11:21     ` Frederic Weisbecker
2021-06-16 11:33       ` Peter Zijlstra
2021-06-04 11:31 ` [PATCH 5/6] posix-cpu-timers: Force next expiration recalc after early timer firing Frederic Weisbecker
2021-06-16  9:42   ` Peter Zijlstra
2021-06-16 11:59     ` Frederic Weisbecker
2021-06-16 13:23       ` Peter Zijlstra
2021-06-16 14:53         ` Frederic Weisbecker
2021-06-04 11:31 ` [PATCH 6/6] posix-cpu-timers: Force next expiration recalc after itimer reset Frederic Weisbecker

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