From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Prarit Bhargava <prarit@redhat.com>,
Mark Salyzyn <salyzyn@android.com>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Orson Zhai <orsonzhai@gmail.com>,
Changki Kim <changki.kim@samsung.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] printk: Store all three timestamps
Date: Thu, 24 Sep 2020 10:45:36 +0900 [thread overview]
Message-ID: <20200924014536.GC577@jagdpanzerIV.localdomain> (raw)
In-Reply-To: <87pn6cdtwa.fsf@jogness.linutronix.de>
On (20/09/24 00:18), John Ogness wrote:
> > diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> > index 1560649cbd35..0ed8901916f4 100644
> > --- a/kernel/printk/printk.c
> > +++ b/kernel/printk/printk.c
> > @@ -520,10 +522,10 @@ static int log_store(u32 caller_id, int facility, int level,
> > r.info->facility = facility;
> > r.info->level = level & 7;
> > r.info->flags = flags & 0x1f;
> > - if (ts_nsec > 0)
> > - r.info->ts_nsec = ts_nsec;
> > + if (ts)
> > + r.info->ts = *ts;
> > else
> > - r.info->ts_nsec = local_clock();
> > + ktime_get_fast_timestamps(&r.info->ts);
>
> I am wondering if we still want to keep the local_clock() as well (and
> as the default). ftrace also uses it by default, which means traces and
> printk logs could be coordinated by default until now.
Good point.
> If we wanted to keep the local clock, should the local clock be a part
> of struct ktime_timestamps? Or should struct printk_info maintain that
> separately (either as @ts_nsec or @ts_local or whatever).
I like the idea of having a dedicated printk_timestamps structure
with the timestamps.
-ss
next prev parent reply other threads:[~2020-09-24 1:45 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 13:56 [RFC 0/2] printk: Add more metadata for each record Petr Mladek
2020-09-23 13:56 ` [PATCH 1/2] printk: Store all three timestamps Petr Mladek
2020-09-23 22:12 ` John Ogness
2020-09-24 1:45 ` Sergey Senozhatsky [this message]
2020-09-24 11:49 ` Petr Mladek
[not found] ` <CAJ-C09hqwOJhSXx1h40q96xhNZFXxP6dUVfjUQZpO4ZhOMZLbQ@mail.gmail.com>
2020-09-25 9:51 ` Petr Mladek
2020-09-24 0:00 ` John Ogness
2020-09-24 10:37 ` Petr Mladek
2020-09-23 13:56 ` [RFC 2/2] printk: Add more information about the printk caller Petr Mladek
2020-09-24 1:40 ` Sergey Senozhatsky
2020-09-24 11:58 ` Petr Mladek
2020-09-24 2:17 ` Sergey Senozhatsky
2020-09-24 8:23 ` John Ogness
2020-09-24 13:26 ` Petr Mladek
2020-09-24 13:06 ` Petr Mladek
2020-09-24 4:24 ` Ahmed S. Darwish
2020-09-24 12:53 ` Petr Mladek
2020-09-24 13:38 ` Petr Mladek
2020-09-25 0:54 ` Sergey Senozhatsky
2020-09-25 10:20 ` Petr Mladek
2020-10-21 11:48 ` 김창기
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