From 88d51967f56f55a45849efe50858ea7dfa0d38dc Mon Sep 17 00:00:00 2001 From: Alan Hourihane Date: Sun, 6 Nov 2005 23:35:34 -0800 Subject: [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 Signed-off-by: Andrew Morton --- drivers/char/agp/intel-agp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers/char/agp/intel-agp.c') diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c index bf4cc9ffd5b1..027161ab88e9 100644 --- a/drivers/char/agp/intel-agp.c +++ b/drivers/char/agp/intel-agp.c @@ -270,6 +270,7 @@ static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type) switch (pg_count) { case 1: addr = agp_bridge->driver->agp_alloc_page(agp_bridge); + global_flush_tlb(); break; case 4: /* kludge to get 4 physical pages for ARGB cursor */ @@ -330,9 +331,11 @@ static void intel_i810_free_by_type(struct agp_memory *curr) if(curr->type == AGP_PHYS_MEMORY) { if (curr->page_count == 4) i8xx_destroy_pages(gart_to_virt(curr->memory[0])); - else + else { agp_bridge->driver->agp_destroy_page( gart_to_virt(curr->memory[0])); + global_flush_tlb(); + } vfree(curr->memory); } kfree(curr); -- cgit v1.2.2