[PATCH] AGP performance fixes

AGP allocation/deallocation is suffering major performance issues due to
the nature of global_flush_tlb() being called on every change_page_attr()
call.

For small allocations this isn't really seen, but when you start allocating
50000 pages of AGP space, for say, texture memory, then things can take
seconds to complete.

In some cases the situation is doubled or even quadrupled in the time due
to SMP, or a deallocation, then a new reallocation.  I've had a case of
upto 20 seconds wait time to deallocate and reallocate AGP space.

This patch fixes the problem by making it the caller's responsibility to
call global_flush_tlb(), and so removes it from every instance of mapping a
page into AGP space until the time that all change_page_attr() changes are
done.

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
index 73f333f491bd..4d5ed18dad00 100644
--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -147,6 +147,7 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
                         printk(KERN_ERR PFX "unable to get memory for scratch page.\n");
                         return -ENOMEM;
                 }
+                global_flush_tlb();
 
                 bridge->scratch_page_real = virt_to_gart(addr);
                 bridge->scratch_page =
@@ -187,9 +188,11 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
         return 0;
 
 err_out:
-        if (bridge->driver->needs_scratch_page)
+        if (bridge->driver->needs_scratch_page) {
                 bridge->driver->agp_destroy_page(
                                 gart_to_virt(bridge->scratch_page_real));
+                global_flush_tlb();
+        }
         if (got_gatt)
                 bridge->driver->free_gatt_table(bridge);
         if (got_keylist) {
@@ -211,9 +214,11 @@ static void agp_backend_cleanup(struct agp_bridge_data *bridge)
         bridge->key_list = NULL;
 
         if (bridge->driver->agp_destroy_page &&
-            bridge->driver->needs_scratch_page)
+            bridge->driver->needs_scratch_page) {
                 bridge->driver->agp_destroy_page(
                                 gart_to_virt(bridge->scratch_page_real));
+                global_flush_tlb();
+        }
 }
 
 /* When we remove the global variable agp_bridge from all drivers