linux-kernel - Re: [PATCH 1/2] treewide: fix memory corruptions when TASK_COMM

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Date:	Thu, 23 Feb 2012 10:09:33 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] treewide: fix memory corruptions when TASK_COMM_LEN
 != 16

On Wednesday 2012-02-22 21:58, Andrew Morton wrote:

>On Wed, 22 Feb 2012 13:48:08 +0100 (CET)
>Jan Engelhardt <jengelh@...ozas.de> wrote:
>
>> task: provide a larger task command buffer
>
><scratches head>
>
>Why are we bothering ourselves about this?

Some prefer to know what's going on in the system. Every other or 
so kernel release there are some new happy kthreads, such as

24930 ?        S      0:00  \_ [btrfs-endio-1]
24931 ?        S      0:00  \_ [btrfs-endio-met]
24932 ?        S      0:00  \_ [btrfs-endio-met]
24933 ?        S      0:00  \_ [btrfs-endio-wri]
24934 ?        S      0:00  \_ [btrfs-freespace]

at which point one is curious to find out the rest of the met and why 
there are two of them. If expanded one actually sees they are different 
kthreads (rather than just per-cpu instances for a WQ, for example)

$ grep Name /proc/{29431,29432}/stat*
/proc/29431/status:Name: btrfs-endio-meta-1
/proc/29432/status:Name: btrfs-endio-meta-write-1

That's all.
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