From eeba5b5cdeac8633cb322084df9b4c3d20960104 Mon Sep 17 00:00:00 2001 From: Paulo Zanoni Date: Tue, 16 Oct 2018 15:01:24 -0700 Subject: [PATCH] drm/i915: remove padding from struct skl_wm_level This reduces the size of struct skl_wm_level from 6 to 4, which reduces the size of struct skl_plane_wm from 104 to 70, which reduces the size of struct skl_pipe_wm from 524 to 356. A reduction of 168 padding bytes per pipe. This will increase even more the next time we bump I915_MAX_PLANES. v2: Paste the pahole output provided by Lucas: $ pahole -s -C skl_wm_level drivers/gpu/drm/i915/i915.o struct skl_wm_level { bool plane_en; /* 0 1 */ /* XXX 1 byte hole, try to pack */ uint16_t plane_res_b; /* 2 2 */ uint8_t plane_res_l; /* 4 1 */ /* size: 6, cachelines: 1, members: 3 */ /* sum members: 4, holes: 1, sum holes: 1 */ /* padding: 1 */ /* last cacheline: 6 bytes */ }; Reviewed-by: Lucas De Marchi Signed-off-by: Paulo Zanoni Link: https://patchwork.freedesktop.org/patch/msgid/20181016220133.26991-3-paulo.r.zanoni@intel.com --- drivers/gpu/drm/i915/i915_drv.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 877eec31f6d2..08d25aa480f7 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1251,9 +1251,9 @@ struct skl_ddb_values { }; struct skl_wm_level { - bool plane_en; uint16_t plane_res_b; uint8_t plane_res_l; + bool plane_en; }; /* Stores plane specific WM parameters */ -- 2.30.2