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    SubjectRe: Change eats memory on my server
    On Mon, Jan 18, 2021 at 08:54:07AM +0100, Thomas Zimmermann wrote:
    > Hi
    >
    > Am 18.01.21 um 08:43 schrieb Christian König:
    > > 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.
    >
    > I have an idea what happens here. When the refcount is 0 in kmap, a new page
    > mapping for the BO is being established. But VRAM helpers unmap the previous
    > pages only on BO moves or frees; not in kunmap. So the old mapping might
    > still be around. I'll send out a test patch later today.
    >

    Great! Looking forward to test it.

    > Best regards
    > Thomas
    >
    > >
    > > Regards,
    > > Christian.
    > >
    > > Am 17.01.21 um 06:08 schrieb Eli Cohen:
    > > > 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@drm.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
    > >
    > > _______________________________________________
    > > dri-devel mailing list
    > > dri-devel@lists.freedesktop.org
    > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
    >
    > --
    > Thomas Zimmermann
    > Graphics Driver Developer
    > SUSE Software Solutions Germany GmbH
    > Maxfeldstr. 5, 90409 Nürnberg, Germany
    > (HRB 36809, AG Nürnberg)
    > Geschäftsführer: Felix Imendörffer
    >



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