[PATCH 12/22] spufs: always map local store non-guarded
From: Arnd Bergmann <arnd@arndb.de>
Date: 2006-11-20 18:14:35
Also in:
lkml
When fixing spufs to map the 'mem' file backing store cacheable, I incorrectly set the physical mapping to use both cache-inhibited and guarded mapping, which resulted in a serious performance degradation. Debugged-by: Michael Ellerman [off-list ref] Signed-off-by: Arnd Bergmann <redacted> --- Index: linux-2.6/arch/powerpc/platforms/cell/spufs/file.c ===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/file.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/file.c@@ -105,11 +105,11 @@ spufs_mem_mmap_nopage(struct vm_area_str if (ctx->state == SPU_STATE_SAVED) { vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot) - & ~(_PAGE_NO_CACHE | _PAGE_GUARDED)); + & ~_PAGE_NO_CACHE); page = vmalloc_to_page(ctx->csa.lscsa->ls + offset); } else { vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot) - | _PAGE_NO_CACHE | _PAGE_GUARDED); + | _PAGE_NO_CACHE); page = pfn_to_page((ctx->spu->local_store_phys + offset) >> PAGE_SHIFT); } --