On Fri, 05 Apr 2013, Ben Widawsky <ben at bwidawsk.net> wrote:
> Only the very first switch doesn't take the path.
>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
> drivers/gpu/drm/i915/i915_gem_context.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index 94d873a..aa080ea 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -390,7 +390,7 @@ static int do_switch(struct i915_hw_context *to)
> * is a bit suboptimal because the retiring can occur simply after the
> * MI_SET_CONTEXT instead of when the next seqno has completed.
> */
> - if (from_obj != NULL) {
> + if (likely(from_obj)) {
Looking at the function, is this, uh, likely to make a difference?
Same goes for the unlikely in patches 4/7. (Yes, patch_es_ 4/7 - there's
*two* patches 4/7 in the series! :o)
I'm just generally wary of adding (un)likely annotations. I don't think
it matters that the annotation itself is obviously correct; IMHO the
performance impact should matter.
</bikeshed>
BR,
Jani.
> from_obj->base.read_domains = I915_GEM_DOMAIN_INSTRUCTION;
> i915_gem_object_move_to_active(from_obj, ring);
> /* As long as MI_SET_CONTEXT is serializing, ie. it flushes the
> --
> 1.8.2
>
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