From: Marcelo Tosatti <mtosatti@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Frederic Weisbecker <frederic@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Nitesh Narayan Lal <nitesh@redhat.com>,
Peter Xu <peterx@redhat.com>
Subject: [patch 0/2] nohz_full: only wakeup target CPUs when notifying new tick dependency (v3)
Date: Thu, 08 Oct 2020 16:11:29 -0300 [thread overview]
Message-ID: <20201008191129.152030255@redhat.com> (raw)
When enabling per-CPU posix timers, an IPI to nohz_full CPUs might be
performed (to re-read the dependencies and possibly not re-enter
nohz_full on a given CPU).
A common case is for applications that run on nohz_full= CPUs
to not use POSIX timers (eg DPDK). This patch changes the notification
to only IPI the target CPUs where the task(s) whose tick dependencies
are being updated are executing.
This reduces interruptions to nohz_full= CPUs.
---
v3: replace superfluous rcu_read_lock with lockdep_assert (PeterZ)
next reply other threads:[~2020-10-08 19:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-08 19:11 Marcelo Tosatti [this message]
2020-10-08 19:11 ` [patch 1/2] nohz: only wakeup a single target cpu when kicking a task Marcelo Tosatti
2020-10-08 19:11 ` [patch 2/2] nohz: change signal tick dependency to wakeup CPUs of member tasks Marcelo Tosatti
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