Re: [PATCH] writeback: skip balance_dirty_pages() for in-memory fs
From: Rik van Riel
Date: Fri Dec 17 2010 - 09:23:17 EST
On 12/17/2010 06:21 AM, Wu Fengguang wrote:
This avoids unnecessary checks and dirty throttling on tmpfs/ramfs.
It also prevents
[ 388.126563] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
in the balance_dirty_pages tracepoint, which will call
dev_name(mapping->backing_dev_info->dev)
but shmem_backing_dev_info.dev is NULL.
CC: Hugh Dickins<hughd@xxxxxxxxxx>
Signed-off-by: Wu Fengguang<fengguang.wu@xxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
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