Messages in this thread | | | Date | Thu, 30 Mar 2006 17:54:06 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH][RFC] splice support |
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On Wed, 29 Mar 2006 14:28:41 +0200 Jens Axboe <axboe@suse.de> wrote: > > + /* > + * Get as many pages from the page cache as possible.. > + * Start IO on the page cache entries we create (we > + * can assume that any pre-existing ones we find have > + * already had IO started on them). > + */ > + i = find_get_pages(mapping, index, pages, array); > +
It looks page caches in this array is hold by pipe until data is consumed. So..this page cannot be reclaimd or migrated and hot-removed :). I don't know about sendfile() but this looks client can hold server's memory, when server uses sendfile() 64k/conn.
Is there a way to force these pages to be freed ? or page reclaimer can know this page is held by splice ? (we need additional PG_flags to do this ?)
I think these pages are necessary to be held only when data in them is used.
--Kame
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