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Jul 2020 06:35:26 +0000 (GMT) Received: from linux.ibm.com (unknown [9.148.203.12]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Tue, 21 Jul 2020 06:35:26 +0000 (GMT) Date: Tue, 21 Jul 2020 09:35:24 +0300 From: Mike Rapoport To: "liwei (CM)" Cc: "Song Bao Hua (Barry Song)" , "catalin.marinas@arm.com" , "will@kernel.org" , fengbaopeng , "nsaenzjulienne@suse.de" , "steve.capper@arm.com" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , sujunfei , "Xiaqing (A)" , "Yaobaofeng (Yaobaofeng)" Subject: Re: =?utf-8?B?562U5aSNOiBbUEFUQ0hdIGFybTY0?= =?utf-8?B?OiBtbTogZnJl?= =?utf-8?Q?e?= unused memmap for sparse memory model that define VMEMMAP Message-ID: <20200721063524.GC802087@linux.ibm.com> References: <20200708015555.14946-1-liwei213@huawei.com> <1699CE87DE933F49876AD744B5DC140F230F8396@DGGEMM506-MBS.china.huawei.com> <1699CE87DE933F49876AD744B5DC140F2312A02B@dggemm526-mbx.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1699CE87DE933F49876AD744B5DC140F2312A02B@dggemm526-mbx.china.huawei.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-21_02:2020-07-21,2020-07-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 spamscore=0 priorityscore=1501 impostorscore=0 mlxscore=0 bulkscore=0 lowpriorityscore=0 adultscore=0 suspectscore=5 clxscore=1011 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007210043 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Tue, Jul 21, 2020 at 01:56:33AM +0000, liwei (CM) wrote: > Hi, all > > I'm sorry to bother you, but still very hope you can give comments or suggestions to this patch, thank you very much. I cannot find your patch neither in Inbox nor in the public archives. Can you resend it please? > -----邮件原件----- > 发件人: Song Bao Hua (Barry Song) > 发送时间: 2020年7月9日 20:27 > 收件人: liwei (CM) ; catalin.marinas@arm.com; will@kernel.org > 抄送: fengbaopeng ; nsaenzjulienne@suse.de; steve.capper@arm.com; rppt@linux.ibm.com; linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org; sujunfei ; Xiaqing (A) ; Yaobaofeng (Yaobaofeng) > 主题: RE: [PATCH] arm64: mm: free unused memmap for sparse memory model that define VMEMMAP > > > > > -----Original Message----- > > From: liwei (CM) > > Sent: Wednesday, July 8, 2020 7:52 PM > > To: Song Bao Hua (Barry Song) ; > > catalin.marinas@arm.com; will@kernel.org > > Cc: fengbaopeng ; nsaenzjulienne@suse.de; > > steve.capper@arm.com; rppt@linux.ibm.com; > > linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org; > > sujunfei ; Xiaqing (A) > > ; Yaobaofeng (Yaobaofeng) > > > > Subject: 答复: [PATCH] arm64: mm: free unused memmap for sparse memory > > model that define VMEMMAP > > > > Hi, baohua > > > > Thank you for your attention. > > > > In my understanding of the MEMORY_HOTPLUG this patch has no effect on it. > > The reason is that in sparse_add_one_section() the memory that memmap > > needs from Slab if kernel start completed，this memory has nothing to > > do with memblock alloc/ free memory in the process of kernel start. > > > > You may have a look vmemmap_alloc_block () this function. > > > > If I don't understand right welcome pointed out in a timely manner. > > At the first glance of this patch, I suspect that this bootmem may be used by hot-added memory. > If you confirm this won't happen, please ignore my noise. > > BTW, next time, bear in mind that top-post is not a good way to reply mail :-) > > > > > Thanks! > > > > > > -----邮件原件----- > > 发件人: Song Bao Hua (Barry Song) > > 发送时间: 2020年7月8日 15:19 > > 收件人: liwei (CM) ; catalin.marinas@arm.com; > > will@kernel.org > > 抄送: fengbaopeng ; nsaenzjulienne@suse.de; > > steve.capper@arm.com; rppt@linux.ibm.com; > > linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org; > > sujunfei > > 主题: RE: [PATCH] arm64: mm: free unused memmap for sparse memory model > > that define VMEMMAP > > > > > > > > > -----Original Message----- > > > From: liwei (CM) > > > Sent: Wednesday, July 8, 2020 1:56 PM > > > To: catalin.marinas@arm.com; will@kernel.org > > > Cc: liwei (CM) ; fengbaopeng > > > ; nsaenzjulienne@suse.de; > > > steve.capper@arm.com; rppt@linux.ibm.com; Song Bao Hua (Barry Song) > > > ; linux-arm-kernel@lists.infradead.org; > > > linux-kernel@vger.kernel.org; sujunfei > > > Subject: [PATCH] arm64: mm: free unused memmap for sparse memory > > model > > > that define VMEMMAP > > > > > > For the memory hole, sparse memory model that define > > SPARSEMEM_VMEMMAP > > > do not free the reserved memory for the page map, this patch do it. > > > > Hello Wei, > > Just curious if this patch breaks MEMORY_HOTPLUG? > > > > > > > > Signed-off-by: Wei Li > > > Signed-off-by: Chen Feng > > > Signed-off-by: Xia Qing > > > --- > > > arch/arm64/mm/init.c | 81 > > > +++++++++++++++++++++++++++++++++++++++++++++------- > > > 1 file changed, 71 insertions(+), 10 deletions(-) > > > > > > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index > > > 1e93cfc7c47a..d1b56b47d5ba 100644 > > > --- a/arch/arm64/mm/init.c > > > +++ b/arch/arm64/mm/init.c > > > @@ -441,7 +441,48 @@ void __init bootmem_init(void) > > > memblock_dump_all(); > > > } > > > > > > > Thanks > > Barry > -- Sincerely yours, Mike.