linux-ext4 - ext3/ext4 and waiting in do_get_write

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Message-ID: <AANLkTimgPmkcvexhhQQEXTjtwEDsqq+d_gXbQjnx_70D@mail.gmail.com>
Date:	Wed, 10 Nov 2010 13:34:30 +0300
From:	Evgeniy Ivanov <lolkaantimat@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: ext3/ext4 and waiting in do_get_write_access

Hi,

I've two types of process: 15 RT small writers (2 page writers) and 3
hard writers. When I start hard writers RT processes start thrashing
in do_get_write_access (waiting can be about 3-6s, but in normal
situation it's expected to make writes in 50-100ms).
I see the place, where we wait in do_get_write_access(). Are there
anything to do with this problem, so I don't get problems with
realtime processes? At least theoretically (I'm unfamiliar with
journaling)?

-- 
Evgeniy Ivanov
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