[Bug 108887] [CI][SHARDS] igt at gem_userptr_blits@readonly-unsync - timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108887

Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #10 from Martin Peres <martin.peres at free.fr> ---
(In reply to Chris Wilson from comment #7)
> commit 8477ed9aeeaa8afb491d73a4c53d1b7dc64413c6 (upstream/master,
> origin/master, origin/HEAD)
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Tue Jan 15 20:50:24 2019 +0000
> 
>     i915/gem_userptr_blits: Only mlock the memfd once, not the arena
>     
>     We multiply the memfd 64k to create a 2G arena which we then attempt to
>     write into after marking read-only. However, when it comes to unlock the
>     arena after the test, performance tanks as the kernel tries to resolve
>     the 64k repeated mappings onto the same set of pages. (Must not be a
>     very common operation!) We can get away with just mlocking the backing
>     store to prevent its eviction, which should prevent the arena mapping
>     from being freed as well.
>     
>     References: https://bugs.freedesktop.org/show_bug.cgi?id=108887
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

It did the trick, thanks! Closing!

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