linux-kernel - Re: [PATCH v2 3/4] mm, page_owner: keep owner info when freeing the page

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Message-ID: <20190924113554.azr3w3blo4h4ask2@box>
Date:   Tue, 24 Sep 2019 14:35:54 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 3/4] mm, page_owner: keep owner info when freeing the
 page

On Tue, Aug 20, 2019 at 03:18:27PM +0200, Vlastimil Babka wrote:
> For debugging purposes it might be useful to keep the owner info even after
> page has been freed, and include it in e.g. dump_page() when detecting a bad
> page state. For that, change the PAGE_EXT_OWNER flag meaning to "page owner
> info has been set at least once" and add new PAGE_EXT_OWNER_ACTIVE for tracking
> whether page is supposed to be currently tracked allocated or free.

Why not PAGE_EXT_OWNER_ALLOCED if it means "allocated"? Active is somewhat
loaded term for a page.

-- 
 Kirill A. Shutemov