diff options
| author | Miod Vallat <miod@cvs.openbsd.org> | 2012-04-25 22:07:36 +0000 |
|---|---|---|
| committer | Miod Vallat <miod@cvs.openbsd.org> | 2012-04-25 22:07:36 +0000 |
| commit | 3f552609ac54f95f970f8906be1228e343eb41b4 (patch) | |
| tree | 208de5c8b9a56c249931aa23edd20e4db35db753 /sys/arch | |
| parent | e955464205074c47103cd2bf1831237c52140317 (diff) | |
Skip cache flushes in pmap_zero_page() and pmap_copy_page() on systems
without virtual aliasing, or for pages which are not currently mapped
cached. 1+% speed increase on sgi IP27 and loongson kernels.
Tested on LS2F, R4400, R5000, R12000 and R16000.
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/mips64/mips64/pmap.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/sys/arch/mips64/mips64/pmap.c b/sys/arch/mips64/mips64/pmap.c index dccef3d6a42..f2ff258ed04 100644 --- a/sys/arch/mips64/mips64/pmap.c +++ b/sys/arch/mips64/mips64/pmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.c,v 1.61 2012/04/24 20:02:03 miod Exp $ */ +/* $OpenBSD: pmap.c,v 1.62 2012/04/25 22:07:35 miod Exp $ */ /* * Copyright (c) 2001-2004 Opsycon AB (www.opsycon.se / www.opsycon.com) @@ -1206,17 +1206,19 @@ pmap_zero_page(struct vm_page *pg) vaddr_t va; pv_entry_t pv; struct cpu_info *ci = curcpu(); + int df = cache_valias_mask != 0; DPRINTF(PDB_FOLLOW, ("pmap_zero_page(%p)\n", phys)); va = (vaddr_t)PHYS_TO_XKPHYS(phys, CCA_CACHED); pv = pg_to_pvh(pg); if ((pg->pg_flags & PV_CACHED) && - ((pv->pv_va ^ va) & cache_valias_mask) != 0) { + (df = ((pv->pv_va ^ va) & cache_valias_mask) != 0)) { Mips_SyncDCachePage(ci, pv->pv_va, phys); } mem_zero_page(va); - Mips_HitSyncDCache(ci, va, PAGE_SIZE); + if (df) + Mips_HitSyncDCache(ci, va, PAGE_SIZE); } /* @@ -1231,11 +1233,11 @@ pmap_copy_page(struct vm_page *srcpg, struct vm_page *dstpg) { paddr_t src, dst; vaddr_t s, d; - int df = 1; - int sf = 1; + int sf, df; pv_entry_t pv; struct cpu_info *ci = curcpu(); + sf = df = cache_valias_mask != 0; src = VM_PAGE_TO_PHYS(srcpg); dst = VM_PAGE_TO_PHYS(dstpg); s = (vaddr_t)PHYS_TO_XKPHYS(src, CCA_CACHED); @@ -1256,10 +1258,10 @@ pmap_copy_page(struct vm_page *srcpg, struct vm_page *dstpg) memcpy((void *)d, (void *)s, PAGE_SIZE); - if (sf) { + if (sf) Mips_HitSyncDCache(ci, s, PAGE_SIZE); - } - Mips_HitSyncDCache(ci, d, PAGE_SIZE); + if (df) + Mips_HitSyncDCache(ci, d, PAGE_SIZE); } /* |