From: Artem Bityutskiy <dedekind@infradead.org>
To: Brijesh Singh <brijesh.s.singh@gmail.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: UBI : Atomic change LEB
Date: Thu, 13 Sep 2007 16:16:28 +0300 [thread overview]
Message-ID: <1189689388.14370.124.camel@sauron> (raw)
In-Reply-To: <6b5362aa0709130602g61e9b6f0xa762be770e95a32b@mail.gmail.com>
On Thu, 2007-09-13 at 18:32 +0530, Brijesh Singh wrote:
> Thank you Artem.
> This seems like a good idea.This will certainly work
> .
> The only problem I see is
> * this will serialize all the automic changes.If some device supports
> multiple writes in parrallel,we are locking it for no reason(We have
> reason but hope we can find another option).Also we won't need
> serialization when there are lots of spare blocks.
Well, this is not a big problem with the existing code base: mtd anyway
locks whole chip when doing I/O, and there are not users of this call
except of UBIFS which will not suffer much.
Also, if this is a problem for someone, we can always reserve N PEBs
for the atomic LEB change operation, and allow N tasks to do this
operation at a time. This is not difficult, we just need to use
something a bit more complex then a mutex.
--
Best regards,
Artem Bityutskiy (Битюцкий Артём)
next prev parent reply other threads:[~2007-09-13 13:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-13 8:02 UBI : Atomic change LEB Brijesh Singh
2007-09-13 11:13 ` Artem Bityutskiy
2007-09-13 13:02 ` Brijesh Singh
2007-09-13 13:16 ` Artem Bityutskiy [this message]
2007-09-13 14:38 ` Jamie Lokier
2007-09-13 15:46 ` Artem Bityutskiy
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