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Date: Mon, 25 Feb 2008 16:15:36 +0100 From: Jörn Engel <joern@...fs.org> To: Andy Whitcroft <apw@...dowen.org> Cc: Jörn Engel <joern@...fs.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: Page scan keeps touching kernel text pages On Mon, 25 February 2008 15:07:24 +0000, Andy Whitcroft wrote: > On Sun, Feb 24, 2008 at 03:47:11PM +0100, Jörn Engel wrote: > > While tracking down some unrelated bug I noticed that shrink_page_list() > > keeps testing very low page numbers (aka kernel text) until deciding > > that the page lacks a mapping and cannot get freed. Looks like a waste > > of cpu and cachelines to me. > > > > Is there a better reason for this behaviour than lack of a patch? > > shrink_page_list() would be expected to be passed pages pulled from > the active or inactive lists via isolate_lru_pages()? I would not have > expected to find the kernel text on the LRU and therefore not expect to > see it passed to shrink_page_list()? Your expectations match mine. At least someone shares my dilusions. :) > I would expect to find pages below the kernel text as real pages, and > potentially on the LRU on some architectures. Which architecture are > you seeing this? Which zones do the pages belong? 32bit x86 (run in qemu, shouldn't make a difference). Not sure about the zones. Let me rerun to check that. Jörn -- Ninety percent of everything is crap. -- Sturgeon's Law -- 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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