linux-kernel - Re: Bug in kernel 2.6.31, Slow wb

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Message-ID: <33307c790907291719r2caf7914xb543877464ba6fc2@mail.gmail.com>
Date:	Wed, 29 Jul 2009 17:19:34 -0700
From:	Martin Bligh <mbligh@...gle.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Chad Talbott <ctalbott@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Michael Rubin <mrubin@...gle.com>,
	Andrew Morton <akpm@...gle.com>, sandeen@...hat.com,
	Michael Davidson <md@...gle.com>
Subject: Re: Bug in kernel 2.6.31, Slow wb_kupdate writeout

BTW, can you explain this code at the bottom of generic_sync_sb_inodes
for me?

                if (wbc->nr_to_write <= 0) {
                        wbc->more_io = 1;
                        break;
                }

I don't understand why we are setting more_io here? AFAICS, more_io
means there's more stuff to write ... I would think we'd set this if
nr_to_write was > 0 ?

Or just have the section below brought up above this
break check and do:

if (!list_empty(&sb->s_more_io) || !list_empty(&sb->s_io))
        wbc->more_io = 1;

Am I just misunderstanding the intent of more_io ?
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