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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 4 Nov 2019 02:34:45 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xA42Y9qL41026004 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 4 Nov 2019 02:34:09 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 469475204E; Mon, 4 Nov 2019 02:34:44 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id E8BF352050; Mon, 4 Nov 2019 02:34:43 +0000 (GMT) Received: from adsilva.ozlabs.ibm.com (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 3CC68A01D6; Mon, 4 Nov 2019 13:34:42 +1100 (AEDT) From: "Alastair D'Silva" To: alastair@d-silva.org Cc: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Christophe Leroy , Thomas Gleixner , Allison Randal , Qian Cai , Nicholas Piggin , Greg Kroah-Hartman , Andrew Morton , David Hildenbrand , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 6/6] powerpc: Don't flush caches when adding memory Date: Mon, 4 Nov 2019 13:32:58 +1100 X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191104023305.9581-1-alastair@au1.ibm.com> References: <20191104023305.9581-1-alastair@au1.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19110402-0008-0000-0000-0000032A5D48 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19110402-0009-0000-0000-00004A49B0CE Message-Id: <20191104023305.9581-7-alastair@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-11-04_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=662 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1911040026 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alastair D'Silva This operation takes a significant amount of time when hotplugging large amounts of memory (~50 seconds with 890GB of persistent memory). This was orignally in commit fb5924fddf9e ("powerpc/mm: Flush cache on memory hot(un)plug") to support memtrace, but the flush on add is not needed as it is flushed on remove. Signed-off-by: Alastair D'Silva --- arch/powerpc/mm/mem.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index a7b662fc02c8..4a424b514772 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -142,8 +142,6 @@ int __ref arch_add_memory(int nid, u64 start, u64 size, return -EFAULT; } - flush_dcache_range_chunked(start, start + size, FLUSH_CHUNK_SIZE); - return __add_pages(nid, start_pfn, nr_pages, restrictions); } -- 2.21.0