linux-kernel - Re: [PATCH 3/6] writeback: Add tracing to write_cache

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Message-ID: <20100604075127.GA7317@infradead.org>
Date:	Fri, 4 Jun 2010 03:51:27 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 3/6] writeback: Add tracing to write_cache_pages

On Fri, Jun 04, 2010 at 09:55:25AM +1000, Dave Chinner wrote:
> Add a trace event to the ->writepage loop in write_cache_pages to give
> visibility into how the ->writepage call is changing variables within the
> writeback control structure. Of most interest is how wbc->nr_to_write changes
> from call to call, especially with filesystems that write multiple pages
> in ->writepage.

Looks good, it might be worth to add another tracepoint for ->writepage
from reclaim context so that we can start investigating the cases where
that happens far too often.

Reviewed-by: Christoph Hellwig <hch@....de>
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