From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gw1.transmode.se (gw1.transmode.se [195.58.98.146]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 8E5C0B7252 for ; Mon, 10 Oct 2011 22:30:45 +1100 (EST) From: Joakim Tjernlund To: linuxppc-dev , Scott Wood , Willy Tarreau , Dan Malek Subject: [PATCH 13/14] 8xx: Optimize TLB Miss handlers Date: Mon, 10 Oct 2011 13:30:19 +0200 Message-Id: <1318246220-4839-14-git-send-email-Joakim.Tjernlund@transmode.se> In-Reply-To: <1318246220-4839-1-git-send-email-Joakim.Tjernlund@transmode.se> References: <1318246220-4839-1-git-send-email-Joakim.Tjernlund@transmode.se> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Only update pte w.r.t ACCESSED if it isn't already set Wrap ACCESSED with #ifndef NO_SWAP for too ease optimization. Signed-off-by: Joakim Tjernlund --- arch/ppc/kernel/head_8xx.S | 11 +++++++++-- 1 files changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/ppc/kernel/head_8xx.S b/arch/ppc/kernel/head_8xx.S index 0f2101d..36089cc 100644 --- a/arch/ppc/kernel/head_8xx.S +++ b/arch/ppc/kernel/head_8xx.S @@ -377,10 +377,14 @@ InstructionTLBMiss: mfspr r21, MD_TWC /* ....and get the pte address */ lwz r20, 0(r21) /* Get the pte */ -#if 1 +#ifndef NO_SWAP /* if !swap, you can delete this */ + andi. r21, r20, _PAGE_ACCESSED /* test ACCESSED bit */ + bne+ 4f /* Branch if set */ + mfspr r21, MD_TWC /* get the pte address */ rlwimi r20, r20, 5, _PAGE_PRESENT<<5 /* Copy PRESENT to ACCESSED */ stw r20, 0(r21) /* Update pte */ +4: #endif /* The Linux PTE won't go exactly into the MMU TLB. * Software indicator bits 21 and 28 must be clear. @@ -450,11 +454,14 @@ DataStoreTLBMiss: DO_8xx_CPU6(0x3b80, r3) mtspr MD_TWC, r21 -#if 1 +#ifndef NO_SWAP /* if !swap, you can delete this */ + andi. r21, r20, _PAGE_ACCESSED /* test ACCESSED bit */ + bne+ 4f /* Branch if set */ mfspr r21, MD_TWC /* get the pte address */ rlwimi r20, r20, 5, _PAGE_PRESENT<<5 /* Copy PRESENT to ACCESSED */ stw r20, 0(r21) /* Update pte */ +4: #endif /* Honour kernel RO, User NA */ -- 1.7.3.4