linux-kernel - Q: kernel log not serialized (SLES10 SP3)?

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Message-Id: <4CC93FB3020000A100010B20@gwsmtp1.uni-regensburg.de>
Date:	Thu, 28 Oct 2010 09:17:39 +0200
From:	"Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de>
To:	<linux-kernel@...r.kernel.org>
Cc:	"Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de>
Subject: Q: kernel log not serialized (SLES10 SP3)?

Hi!

I just found some "interesting" kernel boot messages from a two Dual-Core Opteron machine (SunFire X4100) running SLES10 SP3 (2.6.16.60-0.54.5-xen):
<6>Security Framework v1.0.0 initialized
<4>Mount-cache hash table entries: 256
<6>CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
<6>CPU: L2 Cache: 1024K (64 bytes/line)
<6>checking if image is initramfs... it is
<4>Freeing initrd memory: 8553k freed
<4>Initializing CPU#1
<4>Initializing CPU#2
<6>CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
<6>CPU: L2 Cache: 1024K (64 bytes/line)
<6>Brought up 4 CPUs
<4>Initializing CPU#3
<6>CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
<6>CPU: L2 Cache: 1024K (64 bytes/line)
<6>CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
<6>CPU: L2 Cache: 1024K (64 bytes/line)
<4>migration_cost=523
<6>NET: Registered protocol family 16

The entries seem to be out of order, specifically initializing a CPU after "Brought up 4 CPUs". If the race is intended that way, I'd add the CPU number to the lines that print cache information.

And on "migration cost": It seems to be a penalty for a vector leading from on CPU to another, most likely in a symmetrical fashion. On a NUMA architecture like the Opteron the CPUs could be added to the message. Sample:
CPU1-CPU2: migration cost=523

Regards,
Ulrich
P.S.:Please keep CC: as I'm not subscribed.

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