Messages in this thread | | | Date | Tue, 21 Aug 2007 14:30:59 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [RFC 0/7] Postphone reclaim laundry to write at high water marks |
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On Tue, 21 Aug 2007, Rik van Riel wrote:
> > What is preventing that from occurring right now? If the dirty pags are > > aligned in the right way you can have the exact same situation. > > For one, dirty page writeout is done even when free memory > is low. The kernel will dig into the PF_MEMALLOC reserves, > instead of deciding not to do writeout unless there is lots > of free memory.
Right that is a fundamental problem with this RFC. We need to be able to get into PF_MEMALLOC reserves for writeout.
> Secondly, why would you want to recreate this worst case on > purpose every time the pageout code runs?
I did not intend that to occur.
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