From: Dave Airlie <airlied@redhat.com>
Date: Wed, 19 Sep 2012 01:12:41 +0000 (+1000)
Subject: drm: micro optimise cache flushing
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=87229ad9de079cb12ee09a3dc16113c390b729d5;p=linux-beck.git

drm: micro optimise cache flushing

We hit this a lot with i915 and although we'd like to engineer things to hit
it a lot less, this commit at least makes it consume a few less cycles.

from something containing
movzwl 0x0(%rip),%r10d
to
add    %r8,%rdx

I only noticed it while using perf to profile something else.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 08758e061478..3dbc7f17eb11 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -37,12 +37,13 @@ drm_clflush_page(struct page *page)
 {
 	uint8_t *page_virtual;
 	unsigned int i;
+	const int size = boot_cpu_data.x86_clflush_size;
 
 	if (unlikely(page == NULL))
 		return;
 
 	page_virtual = kmap_atomic(page);
-	for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
+	for (i = 0; i < PAGE_SIZE; i += size)
 		clflush(page_virtual + i);
 	kunmap_atomic(page_virtual);
 }