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

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Date:   Sun, 17 Jan 2021 07:08:37 +0200
From:   Eli Cohen <elic@...dia.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>
CC:     <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <daniel.vetter@...ll.ch>,
        <christian.koenig@....com>, <sam@...nborg.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: Change eats memory on my server

On Fri, Jan 15, 2021 at 10:03:50AM +0100, Thomas Zimmermann wrote:
> 
> Could you please double-check that 3fb91f56aea4 ("drm/udl: Retrieve USB
> device from struct drm_device.dev") works correctly

Checked again, it does not seem to leak.

> and that 823efa922102
> ("drm/cma-helper: Remove empty drm_gem_cma_prime_vunmap()") is broken?
>

Yes, this one leaks, as does the one preceding it: 

1086db71a1db ("drm/vram-helper: Remove invariant parameters from internal kmap function")
 
> For one of the broken commits, could you please send us the output of
> 
>   dmesg | grep -i drm
> 
> after most of the memory got leaked?
> 

I ran the following script in the shell:

while true; do cat /proc/meminfo | grep MemFree:; sleep 5; done

and this is what I saw before I got disconnected from the shell:

MemFree:          148208 kB
MemFree:          148304 kB
MemFree:          146660 kB
Connection to nps-server-24 closed by remote host.
Connection to nps-server-24 closed.


I also mointored the output of dmesg | grep -i drm
The last output I was able to save on disk is this:

[   46.140720] ast 0000:03:00.0: [drm] Using P2A bridge for configuration
[   46.140737] ast 0000:03:00.0: [drm] AST 2500 detected
[   46.140754] ast 0000:03:00.0: [drm] Analog VGA only
[   46.140772] ast 0000:03:00.0: [drm] dram MCLK=800 Mhz type=7 bus_width=16
[   46.153553] [drm] Initialized ast 0.1.0 20120228 for 0000:03:00.0 on minor 0
[   46.165097] fbcon: astdrmfb (fb0) is primary device
[   46.391381] ast 0000:03:00.0: [drm] fb0: astdrmfb frame buffer device
[   56.097697] systemd[1]: Starting Load Kernel Module drm...
[   56.343556] systemd[1]: modprobe@....service: Succeeded.
[   56.350382] systemd[1]: Finished Load Kernel Module drm.
[13319.469462] [   2683] 70889  2683    55586        0    73728      138             0 tdrm
[13320.658386] [   2683] 70889  2683    55586        0    73728      138             0 tdrm
[13321.800970] [   2683] 70889  2683    55586        0    73728      138             0 tdrm