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Re: controlling mmap()'d vs read/write() pages [message #18051 is a reply to message #18002] Wed, 28 March 2007 07:33 Go to previous messageGo to previous message
Nick Piggin is currently offline  Nick Piggin
Messages: 35
Registered: March 2006
Member
Eric W. Biederman wrote:
> Nick Piggin <nickpiggin@yahoo.com.au> writes:

>>It can be done trivially without performing any IO or swap, yes.
> 
> 
> Please give me a rough sketch of how to do so.

Reading sparse files is just one I had in mind. But I'm not very
creative compared to university students doing their assignments.


> Or is this about DOS'ing the system by getting the kernel to allocate
> a large number of data structures (struct file, struct inode, or the like)?

That works too. And I don't believe hand-accounting and limiting
all these things individually as a means to limit RAM usage is sane,
when you have a much more comprehensive and relatively unintrusive
page level scheme.

-- 
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com 

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