From: Artem Bityutskiy <dedekind1@gmail.com>
To: "Hans J. Koch" <hjk@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-mtd@lists.infradead.org,
Adrian Hunter <adrian.hunter@nokia.com>
Subject: Re: ubifs: sync() causes writes even if nothing is changed
Date: Fri, 15 Oct 2010 09:13:01 +0300 [thread overview]
Message-ID: <1287123181.18576.1.camel@localhost> (raw)
In-Reply-To: <20101013163005.GB1889@silverbox.local>
On Wed, 2010-10-13 at 18:30 +0200, Hans J. Koch wrote:
> Running this command:
>
> # while true ; do sync; sleep 1; done
>
> causes two eraseblocks being erased every second, although there
> are no writes to the ubifs filesystem. I hacked some printks into
> my NAND driver that print page_address and column for each erase.
> With that, I get this output every second:
>
> ...
> [ 63.701765] erase p=0x0000ae40 c=0xffffffff
> [ 63.706534] erase p=0xffffffff c=0xffffffff
> [ 63.725492] erase p=0x0000ae80 c=0xffffffff
> [ 63.730260] erase p=0xffffffff c=0xffffffff
> ...
>
> From a quick glance at the ubifs code, this might come out of the
> garbage collector that is triggered on every sync() and writes
> something even if nothing has changed.
>
> Is that really needed?
Hi, no, it is not. I'll look at this as soon as I have some time. There
is already Matthieu's issue waiting in my queue, though. Thanks for
reporting.
--
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
next prev parent reply other threads:[~2010-10-15 6:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-13 16:30 ubifs: sync() causes writes even if nothing is changed Hans J. Koch
2010-10-15 6:13 ` Artem Bityutskiy [this message]
2010-10-20 13:26 ` Artem Bityutskiy
2010-10-21 8:23 ` Sebastian Andrzej Siewior
2010-10-21 8:32 ` Artem Bityutskiy
2010-10-21 17:04 ` Matthieu CASTET
2010-10-21 18:43 ` Artem Bityutskiy
2011-01-16 17:48 ` Artem Bityutskiy
2011-01-17 8:19 ` Adrian Hunter
2011-01-17 9:04 ` Artem Bityutskiy
2011-01-17 21:52 ` Artem Bityutskiy
2011-01-17 21:53 ` [PATCH v2 1/3] UBIFS: re-arrange variables in ubifs_info Artem Bityutskiy
2011-01-17 21:54 ` [PATCH v2 2/3] UBIFS: introduce mounting flag Artem Bityutskiy
2011-01-18 7:30 ` [PATCH v2 3/3] UBIFS: do not start the commit if there is nothing to commit Artem Bityutskiy
2011-01-18 7:36 ` Artem Bityutskiy
2011-01-18 12:29 ` John Ogness
2011-01-21 11:13 ` Artem Bityutskiy
2011-01-21 11:28 ` John Ogness
2011-01-25 8:20 ` Artem Bityutskiy
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