Messages in this thread | | | Date | Mon, 21 Jan 2002 00:49:27 +0300 | From | Hans Reiser <> | Subject | Re: Possible Idea with filesystem buffering. |
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Rik van Riel wrote:
>On Mon, 21 Jan 2002, Hans Reiser wrote: > >>>>and should otherwise check to see if the filesystem supports something >>>>like pressure_fs_cache(), yes? >>>> >>>That's incompatible with the concept of memory zones. >>> >>Care to explain more? >> > >On basically any machine we'll have multiple memory zones. > >Each of those memory zones has its own free list and each >of the zones can get low on free pages independantly of the >other zones. > >This means that if the VM asks to get a particular page >freed, at the very minimum you need to make a page from the >same zone freeable. > >regards, > >Rik >
I'll discuss with Josh tomorrow how we might implement support for that. A clean and simple mechanism does not come to my mind immediately.
Hans
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