linux-kernel - Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

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Message-ID: <ac3eb2510906201136v4c6eac1bwffd2aed3e38c6ae1@mail.gmail.com>
Date:	Sat, 20 Jun 2009 20:36:25 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	jim owens <jowens@...com>, Martin Knoblauch <knobi@...bisoft.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>, efault@....de,
	viro@...iv.linux.org.uk, rjw@...k.pl, linux-kernel@...r.kernel.org,
	shemminger@...tta.com, mike.miller@...com,
	linux-pci@...r.kernel.org
Subject: Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

On Sat, Jun 20, 2009 at 20:26, Matthew Wilcox<matthew@....cx> wrote:
> On Sat, Jun 20, 2009 at 08:19:43PM +0200, Kay Sievers wrote:
>> On Sat, Jun 20, 2009 at 18:58, Matthew Wilcox<matthew@....cx> wrote:
>>
>> > but I don't know what udev is doing. ??The udev source doesn't seem to
>> > read PCI vpd itself:
>> >
>> > udev-0.141$ find -type f |xargs grep -il vpd
>> > ./extras/volume_id/lib/adaptec_raid.c
>> > ./extras/scsi_id/scsi_id.8
>> > ./extras/scsi_id/scsi.h
>> > ./extras/scsi_id/scsi_id.config
>> > ./extras/scsi_id/scsi_serial.c
>> >
>> > so there must be some script that it's invoking which is doing that.
>> > Anyone familiar with udev?
>>
>> scsi_id is usually also called for cciss devices:
>>   KERNEL=="cciss*", ..., IMPORT{program}="scsi_id ...
>
> yes, but it's getting SCSI VPD (by asking for mode pages from the SCSI
> device).  This problem is with PCI VPD which is totally different.

Ah, I see. There is no tool around udev, I know of, which does this.

Maybe someone is still using the broken-by-design libsysfs, which
opens _every_ file it can find in /sys, even when not asked for
anything specific.

Thanks,
Kay
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