From: Andrew Morton <akpm@linux-foundation.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Huang, Ying" <ying.huang@intel.com>, Len Brown <lenb@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH -v2 2/3] ACPI, APEI, Add APEI generic error status print support
Date: Tue, 30 Nov 2010 10:17:44 -0800 [thread overview]
Message-ID: <20101130101744.17efdea4.akpm@linux-foundation.org> (raw)
In-Reply-To: <987664A83D2D224EAE907B061CE93D530191E8BCF1@orsmsx505.amr.corp.intel.com>
On Tue, 30 Nov 2010 10:00:47 -0800 "Luck, Tony" <tony.luck@intel.com> wrote:
> > + for (i = 0; i < strs_size; i++) {
> > + if (!(bits & (1U << i)))
> > + continue;
> > + str = strs[i];
> > + if (len && len + strlen(str) + 2 > 80) {
> > + printk("\n");
> > + len = 0;
> > + }
> > + if (!len)
> > + len = pr_pfx(pfx, "%s", str);
> > + else
> > + len += printk(", %s", str);
> > + }
> > + if (len)
> > + printk("\n");
>
> Does printk() offer any guarantees about getting all the characters
> from a single printk() call out to the console without interleaving
> with messages from printk() calls on other cpus?
Yes, it uses logbuf_lock to atomically append all the output from a
printk into log_buf[]. Then it calls the console drivers against
log_buf[]. It's hard to see how a console driver could then screw that
up.
> If it does, then
> it would be a good idea to sprintf() the parts of this message to
> a buffer and then use one printk() call.
yup.
> I think I read that netconsole
> ends up with one packet on the wire for each call to printk().
>
> Trying to parse output jumbled together from multiple cpus
> doesn't sound like fun.
>
> -Tony
next prev parent reply other threads:[~2010-11-30 18:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-30 2:51 [PATCH -v2 0/3] Report APEI GHES error information via printk Huang Ying
2010-11-30 2:51 ` [PATCH -v2 1/3] Add CPER PCIe error section structure and constants definition Huang Ying
2010-11-30 2:51 ` [PATCH -v2 2/3] ACPI, APEI, Add APEI generic error status print support Huang Ying
2010-11-30 3:03 ` Andrew Morton
2010-11-30 3:29 ` Huang Ying
2010-11-30 3:40 ` Andrew Morton
2010-11-30 7:00 ` Huang Ying
2010-11-30 23:49 ` Andrew Morton
2010-12-01 0:04 ` huang ying
2010-12-01 0:04 ` huang ying
2010-11-30 18:00 ` Luck, Tony
2010-11-30 18:17 ` Andrew Morton [this message]
2010-11-30 23:56 ` huang ying
2010-11-30 23:56 ` huang ying
2010-11-30 2:51 ` [PATCH -v2 3/3] ACPI, APEI, report GHES error information via printk Huang Ying
2010-11-30 3:07 ` Andrew Morton
2010-11-30 3:35 ` Huang Ying
2010-11-30 5:47 ` KOSAKI Motohiro
2010-11-30 6:20 ` Huang Ying
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