linux-kernel - Re: Change eats memory on my server

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Message-ID: <a39c1b62-3e22-2454-d68b-e9eb510891d3@amd.com>
Date:   Mon, 18 Jan 2021 08:57:26 +0100
From:   Christian König <christian.koenig@....com>
To:     Eli Cohen <elic@...dia.com>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, daniel.vetter@...ll.ch,
        sam@...nborg.org, dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: Change eats memory on my server

Am 18.01.21 um 08:49 schrieb Eli Cohen:
> On Mon, Jan 18, 2021 at 08:43:12AM +0100, Christian König wrote:
>> Hi Eli,
>>
>> have you already tried using kmemleak?
>>
>> This sounds like a leak of memory allocated using kmalloc(), so kmemleak
>> should be able to catch it.
>>
> Hi Christian,
>
> I have the following configured but I did not see any visible complaint
> in dmesg.
>
> CONFIG_HAVE_DEBUG_KMEMLEAK=y
> CONFIG_DEBUG_KMEMLEAK=y
> CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE=16000
>
> Any other configuration that I need to set?

As long as you don't have any kernel parameters to enable it I think you 
need to do "echo scan > /sys/kernel/debug/kmemleak" to start a scan.

The result can then be queried using "cat /sys/kernel/debug/kmemleak".

Regards,
Christian.