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Re: [RFC][PATCH 4/7] RSS accounting hooks over the code [message #17744 is a reply to message #17724] Mon, 12 March 2007 17:07 Go to previous messageGo to previous message
dev is currently offline  dev
Messages: 1693
Registered: September 2005
Location: Moscow
Senior Member

> On Mon, 2007-03-12 at 19:23 +0300, Kirill Korotaev wrote:
> 
>>For these you essentially need per-container page->_mapcount counter,
>>otherwise you can't detect whether rss group still has the page in question being mapped
>>in its processes' address spaces or not. 
> 
> 
> What do you mean by this?  You can always tell whether a process has a
> particular page mapped.  Could you explain the issue a bit more.  I'm
> not sure I get it.
When we do charge/uncharge we have to answer on another question:
"whether *any* task from the *container* has this page mapped", not the
"whether *this* task has this page mapped".

Thanks,
Kirill
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