From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <a12169f42790ab7cff5c679588641c55@felloff.net>
Date: Sun,  2 Mar 2014 19:46:41 +0100
From: cinap_lenrek@felloff.net
To: 9fans@9fans.net
In-Reply-To: <CAOw7k5jhcPyB+Ud9wQm-9K-6QWLp7B=RU2FhQGexw1NT-JSTEA@mail.gmail.com>
MIME-Version: 1.0
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Subject: Re: [9fans] imagereclaim()
Topicbox-Message-UUID: c0e577a6-ead8-11e9-9d60-3106f5b1d025

you'r right. the smartness of duppage() isnt really neccesary. we
can just leave the cache alone. when memory is low, newpage() will
uncache pages for us.

fixfault():
		...
		lkp = *pg;
		lock(lkp);
		if(lkp->ref == 0)
			panic("fault %#p ref == 0", lkp);
		if(lkp->ref == 1 && lkp->image == nil) {
			unlock(lkp);
		} else if(lkp->image == &swapimage && (lkp->ref + swapcount(lkp->daddr)) == 1) {
			uncachepage(lkp);
			unlock(lkp);
		} else {
			unlock(lkp);
			new = newpage(0, &s, addr);
			if(s == 0)
				return -1;
			*pg = new;
			copypage(lkp, *pg);
			putpage(lkp);
		}
		mmuphys = PPN((*pg)->pa) | PTEWRITE | PTEVALID;
		(*pg)->modref = PG_MOD|PG_REF;
		break;

--
cinap