From: Tolunay Orkun <listmember@orkun.us>
To: Wolfgang Denk <wd@denx.de>
Cc: White <white@from-b.org>, linuxppc-embedded@ozlabs.org
Subject: Re: Upgrading cramfs root file system while running (DENX wrote that is not possible)
Date: Sat, 22 Apr 2006 14:07:36 -0500 [thread overview]
Message-ID: <444A7EF8.8010709@orkun.us> (raw)
In-Reply-To: <20060421165732.CD0EB3526B7@atlas.denx.de>
Wolfgang Denk wrote:
> In message <20060421055142.11025.qmail@mx1.aruba.it> you wrote:
>
>> No, I have a cramfs on flash and the kernel uses it directly from flash,
>> extracting what it needs to execute. I'm not using initrd then, I have to
>> update in situ, while running.
>>
>
> This cannot be done reliably. You have to make the file system idle,
> i. e. unmount it.
>
I agree, even if you make the executables involved in the update
statically linked (so library dependencies are removed), kernel can
choose to reload any running executables page and it would end up with a
bogus page in memory. This is particularly true if you do not have swap
which you could try to lock executable in swap. Also, you cannot
reliably depend on file system cache to contain all the executable code
you would need to complete update either.
Regards,
Tolunay
next prev parent reply other threads:[~2006-04-22 19:07 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-06 20:38 Upgrading cramfs root file system Antonio Di Bacco
2006-04-19 7:42 ` Wojciech Kromer
2006-04-20 19:54 ` Antonio Di Bacco
2006-04-20 20:18 ` White
2006-04-20 21:03 ` Upgrading cramfs root file system while running (DENX wrote that is not possible) Antonio Di Bacco
2006-04-20 21:08 ` Antonio Di Bacco
2006-04-21 4:10 ` Tolunay Orkun
2006-04-21 5:51 ` antonio.dibacco
2006-04-21 16:57 ` Wolfgang Denk
2006-04-22 19:07 ` Tolunay Orkun [this message]
2006-04-21 16:55 ` Wolfgang Denk
2006-04-22 18:50 ` Tolunay Orkun
2006-04-21 6:53 ` David Jander
2006-04-21 20:23 ` Wolfgang Denk
2006-04-21 21:32 ` Antonio Di Bacco
2006-04-22 11:40 ` Stefan Eletzhofer
2006-04-22 19:21 ` Upgrading cramfs root file system while running (DENX wrote that is not possible)I Antonio Di Bacco
2006-04-22 19:53 ` Upgrading cramfs root file system while running (DENX wrote that is not possible) Tolunay Orkun
[not found] ` <20060420211120.GA3546@mail.gnudd.com>
2006-04-20 21:37 ` Antonio Di Bacco
2006-04-21 6:42 ` Upgrading cramfs root file system Wojciech Kromer
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