linux-kernel - Re: [RFC] log out-of-virtual-memory events

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Date:	Fri, 18 May 2007 09:50:03 +0200 (MEST)
From:	Andrea Righi <righiandr@...rs.sourceforge.net>
To:	Rik van Riel <riel@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [RFC] log out-of-virtual-memory events

Rik van Riel wrote:
> Andrea Righi wrote:
>> I'm looking for a way to keep track of the processes that fail to
>> allocate new
>> virtual memory. What do you think about the following approach
>> (untested)?
>
> Looks like an easy way for users to spam syslogd over and
> over and over again.
>
> At the very least, shouldn't this be dependant on print_fatal_signals?
>

Anyway, with print-fatal-signals enabled a user could spam syslogd too, simply
with a (char *)0 = 0 program, but we could always identify the spam attempts
logging the process uid...

In any case, I agree, it should depend on that patch...

What about adding a simple msleep_interruptible(SOME_MSECS) at the end of
log_vm_enomem() or, at least, a might_sleep() to limit the potential spam/second
rate?

-Andrea
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