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Date: Thu, 31 May 2007 10:58:42 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Pavel Emelianov <xemul@...nvz.org> Cc: Balbir Singh <balbir@...ibm.com>, Paul Menage <menage@...gle.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, devel@...nvz.org, Kirill Korotaev <dev@...nvz.org> Subject: Re: [PATCH 8/8] Per-container pages reclamation On Thu, 31 May 2007 14:35:43 +0400 Pavel Emelianov <xemul@...nvz.org> wrote: > > Would I be correct in guessing that pages which are on the > > per-rss-container lists are also eligible for reclaim off the traditional > > page LRUs? If so, how does that work? When a page gets freed off the > > Yes. All the pages are accessible from booth - global and per-container > LRU lists and reclamation can be performed from booth. > > > per-zone LRUs does it also get removed from the per-rss_container LRU? But > > how can this be right? > > I don't get your idea here. If we have a page which is on the zone LRU with refcount=1 and someone does put_page() on it, we will take that page off the zone LRU and then actually free the page. I am assuming that your patches change that logic so that we will also remove that page from the per-container LRU at the same time? If so, the problem which I see is that, under rare circumstances, that final put_page() will occur from interrupt context. Hence we would be trying to remove the page from the per-container LRU at interrupt time. But the locks which you have in there are not suited for taking from interrupt context. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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