Re: [PATCH] PageCompound avoid page[1].mapping

• To: William Lee Irwin III <[email protected]>
• Subject: Re: [PATCH] PageCompound avoid page[1].mapping
• From: Nick Piggin <[email protected]>
• Date: Mon, 12 Dec 2005 21:46:56 +1100
• Cc: Hugh Dickins <[email protected]>, Andrew Morton <[email protected]>, David Gibson <[email protected]>, Jens Axboe <[email protected]>, "Michael S. Tsirkin" <[email protected]>, [email protected]
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William Lee Irwin III wrote:

On Fri, Dec 09, 2005 at 09:56:42PM +0000, Hugh Dickins wrote:

-	page[1].mapping = (void *)free_huge_page;
+	page[1].index = (unsigned long)free_huge_page;	/* set dtor */
	for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i)
		clear_highpage(&page[i]);
	return page;

Hmm, ->lru would be nicer. What prompted the use of ->index?

Yes, agreed. That would rid you of __page_count() too.

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---

• References:
  • [PATCH] PageCompound avoid page[1].mapping
    • From: Hugh Dickins <[email protected]>
  • Re: [PATCH] PageCompound avoid page[1].mapping
    • From: William Lee Irwin III <[email protected]>

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