linux-kernel - Re: [PATCH v2 0/4] debug_pagealloc improvements through page

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Message-Id: <20190822160344.716eda34585271fa4a519d4c@linux-foundation.org>
Date:   Thu, 22 Aug 2019 16:03:44 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     linux-mm@...ck.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 0/4] debug_pagealloc improvements through page_owner

On Tue, 20 Aug 2019 15:18:24 +0200 Vlastimil Babka <vbabka@...e.cz> wrote:

> v2: also fix THP split handling (added Patch 1) per Kirill
> 
> The debug_pagealloc functionality serves a similar purpose on the page
> allocator level that slub_debug does on the kmalloc level, which is to detect
> bad users. One notable feature that slub_debug has is storing stack traces of
> who last allocated and freed the object. On page level we track allocations via
> page_owner, but that info is discarded when freeing, and we don't track freeing
> at all. This series improves those aspects. With both debug_pagealloc and
> page_owner enabled, we can then get bug reports such as the example in Patch 4.
> 
> SLUB debug tracking additionaly stores cpu, pid and timestamp. This could be
> added later, if deemed useful enough to justify the additional page_ext
> structure size.

Thanks.  I split [1/1] out of the series as a bugfix and turned this
into a three-patch series.