(cc'ing dri-devel) Hi, thanks for reporting the bug. Am 21.01.21 um 15:35 schrieb Chuck Lever:
Hi Thomas- I was not able to find an appropriate mailing list entry in MAINTAINERS,
That would be dri-devel@xxxxxxxxxxxxxxxxxxxxx
so I'm mailing you directly as committer of record for:
43676605f890 ("drm/ttm: Add vmap/vunmap to TTM and TTM GEM helpers")
I've noticed that since putting v5.11-rc on my test systems, overnight
on an otherwise idle system the load average seems to grow as the result
of a kernel worker thread.
Earlier this week I fixed a couple of leaks in that code. Could you please apply the patch at [1] and report back if it fixes the issue.
If it's a separate problem, I'll take a closer look. Best regards Thomas[1] https://lore.kernel.org/dri-devel/20210118144639.27307-1-tzimmermann@xxxxxxx/
I used "perf top" to see what it had gotten up to, and it appears that
it was spending lots of time walking an interval tree on behalf of
memtype_reserve().
The most frequently-observed stack trace seems to be:
kworker/3:1-2355 [003] 60950.150928: function: memtype_reserve
kworker/3:1-2355 [003] 60950.150942: kernel_stack: <stack trace>
=> ffffffffc0c66083
=> memtype_reserve (ffffffffa005f9d5)
=> __ioremap_caller (ffffffffa005aac1)
=> ttm_bo_vmap (ffffffffc040f266)
=> drm_gem_vram_vmap (ffffffffc042c5cd)
=> drm_gem_vmap (ffffffffc0506a7f)
=> drm_client_buffer_vmap (ffffffffc0523741)
=> drm_fb_helper_damage_work (ffffffffc049a34a)
=> process_one_work (ffffffffa00dd92e)
=> worker_thread (ffffffffa00dde46)
=> kthread (ffffffffa00e22c4)
=> ret_from_fork (ffffffffa0004192)
I see a regular call to memtype_reserve(), but never a matching call to
memtype_free(), thus I suspect a leak of I/O maps in this code.
--
Chuck Lever
-- 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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