linux-kernel - Re: [PATCH v2] mm/page_owner: Record the timestamp of all pages during free

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Message-ID: <db54c41c-2bb2-43e8-eb0d-5869a5cff10f@suse.cz>
Date:   Fri, 5 Feb 2021 13:02:08 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Georgi Djakov <georgi.djakov@...aro.org>,
        akpm@...ux-foundation.org, linux-mm@...ck.org
Cc:     corbet@....net, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/page_owner: Record the timestamp of all pages
 during free

On 2/3/21 6:59 PM, Georgi Djakov wrote:
> Collect the time when each allocation is freed, to help with memory
> analysis with kdump/ramdump. Add the timestamp also in the page_owner
> debugfs file and print it in dump_page().
> 
> Having another timestamp when we free the page helps for debugging
> page migration issues. For example both alloc and free timestamps
> being the same can gave hints that there is an issue with migrating
> memory, as opposed to a page just being dropped during migration.
> 
> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

Thanks.