linux-kernel - Re: [PATCHv7 01/19] mm/sparsemem: Allocate mem_section at runtime for SPARSEMEM

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Message-ID: <20170928080711.3msbrmwluqwfhjkg@gmail.com>
Date:   Thu, 28 Sep 2017 10:07:11 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv7 01/19] mm/sparsemem: Allocate mem_section at runtime
 for SPARSEMEM_EXTREME


* Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:

> Size of mem_section array depends on size of physical address space.
> 
> In preparation for boot-time switching between paging modes on x86-64
> we need to make allocation of mem_section dynamic.
> 
> The patch allocates the array on the first call to
> sparse_memory_present_with_active_regions().
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

What is the size of the allocations here, in bytes, for the two main variants?

Thanks,

	Ingo