Messages in this thread | | | Date | Wed, 27 Apr 2005 14:29:28 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: any way to find out kernel memory usage? |
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On Wed, 27 Apr 2005, Coywolf Qi Hunt wrote:
> On 4/28/05, Chris Friesen <cfriesen@nortel.com> wrote: >> >> We recently had an issue with a kernel module leaking memory on unload, >> and a userspace app that unloaded it way too many times. >> >> This ended up using up a bunch of memory, which triggered the oom-killer >> to run, which went wild killing everything in sight since userspace >> wasn't actually the culprt. >> >> One idea we had to prevent this in the future is to configure the OOM >> killer to reset the system if the kernel uses more than a certain amount >> of memory. (Reset is better than hang for our purposes.) Is there any > > Curiously, how to reset? Reboot? (Teach oom killer to kill) or restart > the related > kernel thread? >
In user-mode code... `man 2 reboot` tells all. Quickest way in kernel mode on ix86 is a processor reset.
> >> way to find out how much memory the kernel is using? I don't see >> anything in /proc, but maybe something internal that isn't currently >> exported? >> >> Chris >
In the kernel nr_free_pages() <swap.h> gives you a hint of what's left, num_physpages() tells you what RAM you started with.
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