linux-kernel - Re: [RFC][PATCH] mm: write_cache

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Message-ID: <20090907181253.GA29904@merfinllc.com>
Date:	Mon, 7 Sep 2009 11:12:53 -0700
From:	Aaron Straus <aaron@...finllc.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Adrian Hunter <adrian.hunter@...ia.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"david@...morbit.com" <david@...morbit.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Bityutskiy Artem (Nokia-D/Helsinki)" <Artem.Bityutskiy@...ia.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] mm: write_cache_pages be more sequential

On Sep 07 04:45 PM, Nick Piggin wrote:
> > I meant that only part of the page was written. e.g.
> > write 10240 bytes, wait for writeback, then write another
> > 10240 bytes.  The pages will be written out in the order
> > 0, 1, 2, 3, 4, 2
> 
> OK...
> 
> I guess it is a reasonable workaround for the problem. It is a bit
> unsatisfying to special case on a page basis like this, but anyway
> I don't think there should be a realistic downside in practice.

*NOTE* we also see this in NFS (I think) where a file is written to
sequentially yet readers will see holes in the file.

This is allowed behavior for NFS but annoying.  So a work-around would
be great!

					=a=


-- 
===================
Aaron Straus
aaron@...finllc.com

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