linux-kernel - Re: [RFC] depopulate_range_driver_managed() for removing page-table mappings for hot-added memory blocks

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Date:   Sat, 14 Nov 2020 10:28:53 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Sudarshan Rajagopalan <sudaraja@...eaurora.org>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        David Hildenbrand <david@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Steven Price <steven.price@....com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>,
        Pratik Patel <pratikp@...eaurora.org>
Subject: Re: [RFC] depopulate_range_driver_managed() for removing page-table
 mappings for hot-added memory blocks

On Fri, Nov 13, 2020 at 06:41:22PM -0800, Sudarshan Rajagopalan wrote:
> 
> Hello,
> 
> When memory blocks are removed, along with removing the memmap entries,
> memory resource and memory block devices, the arch specific
> arch_remove_memory() is called which takes care of tearing down the
> page-tables.
> 
> Suppose there???s a usecase where the removed memory blocks will be added
> back into the system at later point,

Stop this crap.  If you have a use case post the actual use here,
including code and specs.  If you don't have that don't waste peoples
time on your pipe dream.