linux-kernel - Re: [PATCH 2.6.20-rc1 00/10] Kernel memory leak detector 0.13

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Date:	Wed, 27 Dec 2006 17:23:38 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Catalin Marinas <catalin.marinas@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.20-rc1 00/10] Kernel memory leak detector 0.13

On Wed, 2006-12-27 at 16:14 +0000, Catalin Marinas wrote:
> On 17/12/06, Ingo Molnar <mingo@...e.hu> wrote:
> > it would be nice to record 1) the jiffies value at the time of
> > allocation, 2) the PID and the comm of the task that did the allocation.
> > The jiffies timestamp would be useful to see the age of the allocation,
> > and the PID/comm is useful for context.
> 
> Trying to copy the comm with get_task_comm, I get the lockdep report
> below, caused by acquiring the task's alloc_lock. Any idea how to go
> around this?

well you take the lock from irq context, which means it needs to use
_irqsave/restore everywhere. (and all locks taken inside it must be irq
safe as well)

maybe.. not use  comm in irq context? it doesn't actually mean anything
there anyway...


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