linux-kernel - Re: [RFC PATCH v2 17/17] sched: Debug bits...

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Message-ID: <CAERHkruv6807HyPg=UvjLiO-2uzDJgw1=44HyWQ73mnYVB37TQ@mail.gmail.com>
Date:   Sat, 18 May 2019 01:18:24 +0800
From:   Aubrey Li <aubrey.intel@...il.com>
To:     Vineeth Remanan Pillai <vpillai@...italocean.com>
Cc:     Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Subhra Mazumdar <subhra.mazumdar@...cle.com>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kerr <kerrnel@...gle.com>, Phil Auld <pauld@...hat.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC PATCH v2 17/17] sched: Debug bits...

On Wed, Apr 24, 2019 at 12:18 AM Vineeth Remanan Pillai
<vpillai@...italocean.com> wrote:
>
> From: Peter Zijlstra (Intel) <peterz@...radead.org>
>
> Not-Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  kernel/sched/core.c | 38 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 0e3c51a1b54a..e8e5f26db052 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -106,6 +106,10 @@ static inline bool __prio_less(struct task_struct *a, struct task_struct *b, boo
>
>         int pa = __task_prio(a), pb = __task_prio(b);
>
> +       trace_printk("(%s/%d;%d,%Lu,%Lu) ?< (%s/%d;%d,%Lu,%Lu)\n",
> +                    a->comm, a->pid, pa, a->se.vruntime, a->dl.deadline,
> +                    b->comm, b->pid, pa, b->se.vruntime, b->dl.deadline);
> +

a minor nitpick

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3e3162f..68c518c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -93,7 +93,7 @@ static inline bool __prio_less(struct task_struct
*a, struct task_struct *b, u64

        trace_printk("(%s/%d;%d,%Lu,%Lu) ?< (%s/%d;%d,%Lu,%Lu)\n",
                        a->comm, a->pid, pa, a->se.vruntime, a->dl.deadline,
-                       b->comm, b->pid, pa, b->se.vruntime, b->dl.deadline);
+                       b->comm, b->pid, pb, b->se.vruntime, b->dl.deadline);


        if (-pa < -pb)
                return true;