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[2001:b011:20e0:1b32:d148:19d6:82fa:6094]) by smtp.gmail.com with ESMTPSA id n11-20020a170902e54b00b00176ca74c58bsm1836627plf.245.2022.09.27.10.36.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Sep 2022 10:36:34 -0700 (PDT) Date: Wed, 28 Sep 2022 01:36:27 +0800 From: Chih-En Lin To: Nadav Amit Cc: Andrew Morton , Qi Zheng , David Hildenbrand , Matthew Wilcox , Christophe Leroy , LKML , Linux MM , Luis Chamberlain , Kees Cook , Iurii Zaikin , Vlastimil Babka , William Kucharski , "Kirill A . Shutemov" , Peter Xu , Suren Baghdasaryan , Arnd Bergmann , Tong Tiangen , Pasha Tatashin , Li kunyu , Anshuman Khandual , Minchan Kim , Yang Shi , Song Liu , Miaohe Lin , Thomas Gleixner , Sebastian Andrzej Siewior , Andy Lutomirski , Fenghua Yu , Dinglan Peng , Pedro Fonseca , Jim Huang , Huichun Feng Subject: Re: [RFC PATCH v2 1/9] mm: Add new mm flags for Copy-On-Write PTE table Message-ID: References: <20220927162957.270460-1-shiyn.lin@gmail.com> <20220927162957.270460-2-shiyn.lin@gmail.com> <60437F8E-F4A6-4008-9385-F8DAA9C2EA5E@vmware.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <60437F8E-F4A6-4008-9385-F8DAA9C2EA5E@vmware.com> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1664300196; a=rsa-sha256; cv=none; b=BTgGZSOiLWDTsgYgo8jIewH+gS8yZMZWe/dGBzO11acPdhWMV354NWitZQXFMMJLDxsmwn YBar2+R3wNFLZf/o0K0nSD+qaKMaCGxVp8Q1IXqxBByxX2oEdSnCUqU0X6k+bQQpVRmuwo F/ETgP/BQeDkwaJ3c2aIcYVvik3GW3E= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=cmptD7Fa; spf=pass (imf14.hostedemail.com: domain of shiyn.lin@gmail.com designates 209.85.210.169 as permitted sender) smtp.mailfrom=shiyn.lin@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1664300196; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=YvDuPsFOyzRquHOz07w9Zdf7b3JPyOcExQmvq44UjLw=; b=UQSvaVDIYXbTT9AFOlBTdUTqFbfUmgk1i2wQGmH9Vd+Y1ElPwYI4SpIh/J1OWILBm55TN6 J4//YGbnq47Uv7wNa83JHUH45Ae1lWdF6MSgpavO3hU9rHbz7upgAiLq6Yn6Ryw+zUD9E7 chHkwkJe/1oIoBHetFAXNEDpsTubGKs= X-Stat-Signature: 5goape3cbwxzt9nimdk76s84oe9iz96p X-Rspam-User: X-Rspamd-Queue-Id: 5CB6E100007 X-Rspamd-Server: rspam04 Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=cmptD7Fa; spf=pass (imf14.hostedemail.com: domain of shiyn.lin@gmail.com designates 209.85.210.169 as permitted sender) smtp.mailfrom=shiyn.lin@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-HE-Tag: 1664300196-140053 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Sep 27, 2022 at 05:23:58PM +0000, Nadav Amit wrote: > On Sep 27, 2022, at 9:29 AM, Chih-En Lin wrote: > > > Add MMF_COW_PTE{, _READY} flags to prepare the subsequent > > implementation of Copy-On-Write for the page table. > > > > Signed-off-by: Chih-En Lin > > --- > > include/linux/sched/coredump.h | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h > > index 4d0a5be28b70f..f03ff69c90c8c 100644 > > --- a/include/linux/sched/coredump.h > > +++ b/include/linux/sched/coredump.h > > @@ -84,7 +84,13 @@ static inline int get_dumpable(struct mm_struct *mm) > > #define MMF_HAS_PINNED 28 /* FOLL_PIN has run, never cleared */ > > #define MMF_DISABLE_THP_MASK (1 << MMF_DISABLE_THP) > > > > +#define MMF_COW_PTE_READY 29 > > +#define MMF_COW_PTE_READY_MASK (1 << MMF_COW_PTE_READY) > > + > > +#define MMF_COW_PTE 30 > > +#define MMF_COW_PTE_MASK (1 << MMF_COW_PTE) > > I am not sure how much sense it makes to put it in a separate patch, and it > is rather hard to understand the new flags without proper documentation and > comments. > I had considered putting it with the sysctl patch, but since these two flags are not related to the sysctl, so I put it in a separate patch. Maybe I can put those (sysctl and this patch) together and take a suitable commit message. I will consider it again. For the proper documentation/comments, I will also add it in next version. Thanks, Chih-En Lin