linux-kernel - Re: [PATCH] slub: Fix misleading 'age' in verbose slub prints

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Message-ID: <alpine.DEB.2.20.1803071212150.6373@nuc-kabylake>
Date:   Wed, 7 Mar 2018 12:13:56 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Chintan Pandya <cpandya@...eaurora.org>
cc:     penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slub: Fix misleading 'age' in verbose slub prints

On Wed, 7 Mar 2018, Chintan Pandya wrote:

> In this case, object got freed later but 'age' shows
> otherwise. This could be because, while printing
> this info, we print allocation traces first and
> free traces thereafter. In between, if we get schedule
> out, (jiffies - t->when) could become meaningless.

Ok then get the jiffies earlier?

> So, simply print when the object was allocated/freed.

The tick value may not related to anything in the logs that is why the
"age" is there. How do I know how long ago the allocation was if I look at
the log and only see long and large number of ticks since bootup?