[Intel-gfx] [PATCH] drm/i915/gt: Delay taking the spinlock for grabbing from the buffer pool

[Matthew Auld]

On Tue, 28 Jul 2020 at 16:59, Chris Wilson <chris at chris-wilson.co.uk> wrote:
>
> Some very low hanging fruit, but contention on the pool->lock is
> noticeable between intel_gt_get_buffer_pool() and pool_retire(), with
> the majority of the hold time due to the locked list iteration. If we
> make the node itself RCU protected, we can perform the search for an
> suitable node just under RCU, reserving taking the lock itself for
> claiming the node and manipulating the list.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>