From: Christopher Lameter <cl@linux.com>
To: Chintan Pandya <cpandya@codeaurora.org>
Cc: penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] slub: Fix misleading 'age' in verbose slub prints
Date: Wed, 7 Mar 2018 12:13:56 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.20.1803071212150.6373@nuc-kabylake> (raw)
In-Reply-To: <1520423266-28830-1-git-send-email-cpandya@codeaurora.org>
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?
WARNING: multiple messages have this Message-ID (diff)
From: Christopher Lameter <cl@linux.com>
To: Chintan Pandya <cpandya@codeaurora.org>
Cc: penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] slub: Fix misleading 'age' in verbose slub prints
Date: Wed, 7 Mar 2018 12:13:56 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.20.1803071212150.6373@nuc-kabylake> (raw)
In-Reply-To: <1520423266-28830-1-git-send-email-cpandya@codeaurora.org>
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?
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next prev parent reply other threads:[~2018-03-07 18:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-07 11:47 [PATCH] slub: Fix misleading 'age' in verbose slub prints Chintan Pandya
2018-03-07 11:47 ` Chintan Pandya
2018-03-07 18:13 ` Christopher Lameter [this message]
2018-03-07 18:13 ` Christopher Lameter
2018-03-07 18:22 ` Matthew Wilcox
2018-03-07 18:22 ` Matthew Wilcox
2018-03-08 6:51 ` Chintan Pandya
2018-03-08 18:09 ` Christopher Lameter
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