From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v2 3/4] irq_work: Handle some irq_work in a per-CPU thread on PREEMPT_RT
Date: Wed, 6 Oct 2021 13:35:29 +0200 [thread overview]
Message-ID: <20211006113529.xgieqegb6u3nxjvx@linutronix.de> (raw)
In-Reply-To: <20211006111852.1514359-4-bigeasy@linutronix.de>
On 2021-10-06 13:18:51 [+0200], To linux-kernel@vger.kernel.org wrote:
> diff --git a/kernel/irq_work.c b/kernel/irq_work.c
> index e789beda8297d..daa5d12522faa 100644
> --- a/kernel/irq_work.c
> +++ b/kernel/irq_work.c
> @@ -18,11 +18,34 @@
> #include <linux/cpu.h>
> #include <linux/notifier.h>
> #include <linux/smp.h>
> +#include <linux/smpboot.h>
> #include <asm/processor.h>
> #include <linux/kasan.h>
>
> static DEFINE_PER_CPU(struct llist_head, raised_list);
> static DEFINE_PER_CPU(struct llist_head, lazy_list);
> +static DEFINE_PER_CPU(struct task_struct *, irq_workd);
> +
> +static void wake_irq_workd(void)
> +{
> + struct task_struct *tsk = __this_cpu_read(irq_workd);
> +
> + if (!llist_empty(this_cpu_ptr(&lazy_list)) && tsk)
> + wake_up_process(tsk);
> +}
#ifdef CONFIG_SMP
> +static void irq_work_wake(struct irq_work *entry)
> +{
> + wake_irq_workd();
> +}
> +
> +static DEFINE_PER_CPU(struct irq_work, irq_work_pending) =
> + IRQ_WORK_INIT_HARD(irq_work_wake);
#endif
> +static int irq_workd_should_run(unsigned int cpu)
> +{
> + return !llist_empty(this_cpu_ptr(&lazy_list));
> +}
>
> /*
> * Claim the entry so that no one else will poke at it.
Sebastian
next prev parent reply other threads:[~2021-10-06 11:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-06 11:18 [PATCH v2 0/4] irq_work: PREEMPT_RT bits Sebastian Andrzej Siewior
2021-10-06 11:18 ` [PATCH v2 1/4] sched/rt: Annotate the RT balancing logic irqwork as IRQ_WORK_HARD_IRQ Sebastian Andrzej Siewior
2021-10-13 22:13 ` Steven Rostedt
2021-10-15 9:44 ` [tip: sched/core] " tip-bot2 for Sebastian Andrzej Siewior
2021-10-06 11:18 ` [PATCH v2 2/4] irq_work: Allow irq_work_sync() to sleep if irq_work() no IRQ support Sebastian Andrzej Siewior
2021-10-15 9:44 ` [tip: sched/core] " tip-bot2 for Sebastian Andrzej Siewior
2021-10-06 11:18 ` [PATCH v2 3/4] irq_work: Handle some irq_work in a per-CPU thread on PREEMPT_RT Sebastian Andrzej Siewior
2021-10-06 11:35 ` Sebastian Andrzej Siewior [this message]
2021-10-06 16:26 ` kernel test robot
2021-10-07 8:50 ` Peter Zijlstra
2021-10-07 9:08 ` Sebastian Andrzej Siewior
2021-10-07 9:26 ` [PATCH v3 " Sebastian Andrzej Siewior
2021-10-15 9:44 ` [tip: sched/core] " tip-bot2 for Sebastian Andrzej Siewior
2021-10-06 11:18 ` [PATCH v2 4/4] irq_work: Also rcuwait for !IRQ_WORK_HARD_IRQ " Sebastian Andrzej Siewior
2021-10-15 9:44 ` [tip: sched/core] " tip-bot2 for Sebastian Andrzej Siewior
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20211006113529.xgieqegb6u3nxjvx@linutronix.de \
--to=bigeasy@linutronix.de \
--cc=linux-kernel@vger.kernel.org \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).