linux-kernel - Re: PATCH] fix potential latency issues in JBD's journal code

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Date:	Sat, 5 Jul 2008 10:13:35 -0400
From:	Theodore Tso <tytso@....edu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	linux-kernel@...r.kernel.org
Subject: Re: PATCH] fix potential latency issues in JBD's journal code

Acked-by: "Theodore Ts'o" <tytso@....edu>

I will make the corresponding change for ext4.  Is the "Properly
notify block layer of sync writes" going to be pushed to mainline?  I
can't add SWRITE_SYNC to the ext4 tree without growing a dependency to
this patch.

> This patch modifies two key places that submit IO that then immediately will
> get waited on. The JBD code is slightly convoluted, but after some chasing of
> abstraction layers, these instances seem to really be of this pattern.
> There's one case in checkpoint.c which is another candidate, but I've not
> been able to get my head around the code enough to verify that that one
> really is of this pattern as well, so for now I'll leave that one as is.

You mean the ll_rw_block() SWRITE in __flush_patch?  Yep, seems to be
of the same pattern.

						- Ted

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