[Bug 31412] radeon memory leak

[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412


Andrew Morton <akpm@linux-foundation.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Other                       |Video(DRI - non Intel)
         AssignedTo|akpm@linux-foundation.org   |drivers_video-dri@kernel-bu
                   |                            |gs.osdl.org
            Product|Memory Management           |Drivers




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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412


Andrew Morton <akpm@linux-foundation.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |akpm@linux-foundation.org




--- Comment #1 from Andrew Morton <akpm@linux-foundation.org>  2011-03-18 20:31:35 ---
It's a little unclear - is this a regression?  If so, is it a 2.6.37 -> 2.6.38
regression?

Thanks.

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #2 from Kevin <kjslag@gmail.com>  2011-03-18 20:47:01 ---
It's not a regression. I also experienced the problem with 2.6.37 and 2.6.36. I
haven't tested any other kernel versions; I got my laptop in December.

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412


Dave Airlie <airlied@linux.ie> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |airlied@linux.ie




--- Comment #3 from Dave Airlie <airlied@linux.ie>  2011-03-18 21:01:21 ---
1df6a2ebd75067aefbdf07482bf8e3d0584e04ee

was the fix for the original problem, which was in 2.6.37.

Unless something we've done since is causing it or another race to happen.

So logging out of X doesn't get the memory back?

can you attach the contents of /sys/kernel/debug/dri/0/radeon_vram_mm and
radeon_gtt_mm? (after mounting debugfs).

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #4 from Kevin <kjslag@gmail.com>  2011-03-18 21:25:15 ---
The problem occurred in 2.6.37 also.

Logging out of X doesn't get the memory back.

I'm also not sure if just scrolling a lot causes the problem. It seems to be
easier for me to consume memory by opening many .pdf files.


Here is some output after logging out of X (I still had about ~30MB from root
processes):

$ free -m
             total       used       free     shared    buffers     cached
Mem:          5920       2668       3252          0         96       1088
-/+ buffers/cache:       1484       4436
Swap:         7998          0       7998

$ cat /sys/kernel/debug/dri/0/radeon_vram_mm
0x00000000-0x00000040: 0x00000040: used
0x00000040-0x00000140: 0x00000100: used
0x00000140-0x00000141: 0x00000001: used
0x00000141-0x0000092a: 0x000007e9: used
0x0000092a-0x00040000: 0x0003f6d6: free
total: 262144, used 2346 free 259798

$ cat /sys/kernel/debug/dri/0/radeon_gtt_mm 
0x00000000-0x00000001: 0x00000001: used
0x00000001-0x00000011: 0x00000010: used
0x00000011-0x00000111: 0x00000100: used
0x00000111-0x00000211: 0x00000100: used
0x00000211-0x00020000: 0x0001fdef: free
total: 131072, used 529 free 130543

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #5 from Dave Airlie <airlied@linux.ie>  2011-03-19 07:16:26 ---
how about cat /sys/kernel/debug/dri/0/ttm_page_pool

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #6 from Dave Airlie <airlied@linux.ie>  2011-03-19 07:17:08 ---
how about cat /sys/kernel/debug/dri/0/ttm_page_pool 

and /sys/class/drm/ttm/memory_accounting/*/*

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #7 from Kevin <kjslag@gmail.com>  2011-03-19 09:15:54 ---
Created an attachment (id=51232)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=51232)
debug info

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #8 from Kevin <kjslag@gmail.com>  2011-03-19 09:17:19 ---
The attached "debug info" above is output after logging out of X (I still had
about ~30MB from root processes). It includes what Dave asked for. FYI, I
haven't rebooted since my last post.

$ free -m
             total       used       free     shared    buffers     cached
Mem:          5920       4279       1641          0        212       2547
-/+ buffers/cache:       1519       4401
Swap:         7998          0       7998

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #9 from Dave Airlie <airlied@linux.ie>  2011-03-19 22:07:30 ---
I'm having trouble reconciling this with the graphics driver.

a) you claim it happens with fglrx as well, there is nothing shared between
them
(so it can't be a common gpu bug)

b) nothing is leaking according to that debug info in anywhere obvious.

One last test would be unload the gpu stack to see what happens

got to runlevel 3 or anywhere X isn't rnunig
echo 0 > /sys/class/vtconsole/vtcon1/bind
rmmod radeon ttm drm_kms_helper drm

see if memory is still gone.

maybe you can watch /proc/slabinfo to see where the memory might be going. It
might also just be page cache from the pdf loading,

does echo 3 > /proc/sys/vm/drop_caches help?

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[Bug 31412] radeon memory leak

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https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #10 from Kevin <kjslag@gmail.com>  2011-03-20 20:40:04 ---
echo 3 > /proc/sys/vm/drop_caches
cleared all of the memory. Thank you! See output below (ran after exiting X).
I didn't try unloading the gpu stack. I can try it if you like.


I also saved /proc/slabinfo before and after I dropped the caches. If I'm
interpreting the file correctly, I only notice large drops in ext4 filesystem
stuff. Is there a way to tell which slabs are considered buffers or cache?


# free -m
             total       used       free     shared    buffers     cached
Mem:          5920       4318       1602          0        113       2465
-/+ buffers/cache:       1740       4180
Swap:         7998          0       7998
# echo 3 > /proc/sys/vm/drop_caches
# free -m
             total       used       free     shared    buffers     cached
Mem:          5920        225       5695          0          3         12
-/+ buffers/cache:        209       5711
Swap:         7998          0       7998

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[Bug 31412] radeon memory leak

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https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #11 from Kevin <kjslag@gmail.com>  2011-03-20 20:40:18 ---
Created an attachment (id=51392)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=51392)
slabinfo before echo 3 > /proc/sys/vm/drop_caches

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #12 from Kevin <kjslag@gmail.com>  2011-03-20 20:40:48 ---
Created an attachment (id=51402)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=51402)
slabinfo after echo 3 > /proc/sys/vm/drop_caches

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[Bug 31412] radeon memory leak

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=31412





--- Comment #13 from Kevin <kjslag@gmail.com>  2011-06-02 02:57:29 ---
So is this something that should be fixed or is everything working as intended?
To me, it doesn't seem correct. Unused caches shouldn't be stored in my "used"
memory.

Is there anything else that I should try to help?
Can anyone else reproduce this? I just open large pdfs and scroll through them.

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Jesse Zhang <zh.jesse@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zh.jesse@gmail.com




--- Comment #14 from Jesse Zhang <zh.jesse@gmail.com>  2011-06-02 05:56:22 ---
There is no leaking here. A quick google search turns up
http://sourcefrog.net/weblog/software/linux-kernel/free-mem.html.

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--- Comment #15 from Kevin <kjslag@gmail.com>  2011-06-02 17:24:35 ---
I'm sorry. I wasn't clear. There is NOT a memory leak.

Below is some of my 'free -m' output from above. My question is, why does the
'used -/+ buffers/cache' decrease when I 'echo 3 > /proc/sys/vm/drop_caches'?


# free -m
             total       used       free     shared    buffers     cached
Mem:          5920       4318       1602          0        113       2465
-/+ buffers/cache:       1740       4180
Swap:         7998          0       7998
# echo 3 > /proc/sys/vm/drop_caches
# free -m
             total       used       free     shared    buffers     cached
Mem:          5920        225       5695          0          3         12
-/+ buffers/cache:        209       5711
Swap:         7998          0       7998

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