| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1325712916-27962-2-git-send-email-konrad.wilk@oracle.com>
Date: Wed, 4 Jan 2012 16:35:14 -0500
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
j.glisse@...il.com, bskeggs@...hat.com, thellstrom@...are.co,
airlied@...ux.ie
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 1/3] drm/ttm/dma: Only call set_pages_array_wb when the page is not in WB pool.
Otherwise we are doing redundant work. Especially since the 'unbind'
and 'unpopulate' have been merged and nouveau driver ends up calling
it quite excessivly. On a GeForce 8600 GT with Gnome Shell (GNOME 3)
we end up spending about 54% CPU time in __change_page_attr_set_clr
checking the page flags.
The callgraph (annotated) looks as so before this patch:
53.29% gnome-shell [kernel.kallsyms] [k] static_protections
|
--- static_protections
|
|--91.80%-- __change_page_attr_set_clr
| change_page_attr_set_clr
| set_pages_array_wb
| |
| |--96.55%-- ttm_dma_unpopulate
| | nouveau_ttm_tt_unpopulate
| | ttm_tt_destroy
| | ttm_bo_cleanup_memtype_use
| | ttm_bo_release
| | kref_put
| | ttm_bo_unref
| | nouveau_gem_object_del
| | drm_gem_object_free
| | kref_put
| | drm_gem_object_unreference_unlocked
| | drm_gem_object_handle_unreference_unlocked.part.1
| | drm_gem_handle_delete
| | drm_gem_close_ioctl
| | drm_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call_fastpath
| | __GI___ioctl
| |
| --3.45%-- ttm_dma_pages_put
| ttm_dma_page_pool_free
| ttm_dma_unpopulate
| nouveau_ttm_tt_unpopulate
| ttm_tt_destroy
| ttm_bo_cleanup_memtype_use
| ttm_bo_release
| kref_put
| ttm_bo_unref
| nouveau_gem_object_del
| drm_gem_object_free
| kref_put
| drm_gem_object_unreference_unlocked
| drm_gem_object_handle_unreference_unlocked.part.1
| drm_gem_handle_delete
| drm_gem_close_ioctl
| drm_ioctl
| do_vfs_ioctl
| sys_ioctl
| system_call_fastpath
| __GI___ioctl
|
--8.20%-- change_page_attr_set_clr
set_pages_array_wb
|
|--93.76%-- ttm_dma_unpopulate
| nouveau_ttm_tt_unpopulate
| ttm_tt_destroy
| ttm_bo_cleanup_memtype_use
| ttm_bo_release
| kref_put
| ttm_bo_unref
| nouveau_gem_object_del
| drm_gem_object_free
| kref_put
| drm_gem_object_unreference_unlocked
| drm_gem_object_handle_unreference_unlocked.part.1
| drm_gem_handle_delete
| drm_gem_close_ioctl
| drm_ioctl
| do_vfs_ioctl
| sys_ioctl
| system_call_fastpath
| __GI___ioctl
|
--6.24%-- ttm_dma_pages_put
ttm_dma_page_pool_free
ttm_dma_unpopulate
nouveau_ttm_tt_unpopulate
ttm_tt_destroy
ttm_bo_cleanup_memtype_use
ttm_bo_release
kref_put
ttm_bo_unref
nouveau_gem_object_del
drm_gem_object_free
kref_put
drm_gem_object_unreference_unlocked
drm_gem_object_handle_unreference_unlocked.part.1
drm_gem_handle_delete
drm_gem_close_ioctl
drm_ioctl
do_vfs_ioctl
sys_ioctl
system_call_fastpath
__GI___ioctl
and after this patch all of that disappears.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index 6678abc..6c06d0b 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -384,7 +384,9 @@ static void ttm_dma_pages_put(struct dma_pool *pool, struct list_head *d_pages,
{
struct dma_page *d_page, *tmp;
- if (npages && set_pages_array_wb(pages, npages))
+ /* Don't set WB on WB page pool. */
+ if (npages && !(pool->type & IS_CACHED) &&
+ set_pages_array_wb(pages, npages))
pr_err(TTM_PFX "%s: Failed to set %d pages to wb!\n",
pool->dev_name, npages);
@@ -396,7 +398,8 @@ static void ttm_dma_pages_put(struct dma_pool *pool, struct list_head *d_pages,
static void ttm_dma_page_put(struct dma_pool *pool, struct dma_page *d_page)
{
- if (set_pages_array_wb(&d_page->p, 1))
+ /* Don't set WB on WB page pool. */
+ if (!(pool->type & IS_CACHED) && set_pages_array_wb(&d_page->p, 1))
pr_err(TTM_PFX "%s: Failed to set %d pages to wb!\n",
pool->dev_name, 1);
--
1.7.7.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists