From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
linux-mm@kvack.org, Cyrill Gorcunov <gorcunov@openvz.org>,
Pavel Emelyanov <xemul@openvz.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mm: rename mm->nr_ptes to mm->nr_pgtables
Date: Tue, 13 Jan 2015 22:41:44 +0200 [thread overview]
Message-ID: <20150113204144.GA1865@node.dhcp.inet.fi> (raw)
In-Reply-To: <54B581C7.50206@linux.intel.com>
On Tue, Jan 13, 2015 at 12:36:23PM -0800, Dave Hansen wrote:
> On 01/13/2015 11:14 AM, Kirill A. Shutemov wrote:
> > pgd_t * pgd;
> > atomic_t mm_users; /* How many users with user space? */
> > atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
> > - atomic_long_t nr_ptes; /* Page table pages */
> > + atomic_long_t nr_pgtables; /* Page table pages */
> > int map_count; /* number of VMAs */
>
> One more crazy idea...
>
> There are 2^9 possible pud pages, 2^18 pmd pages and 2^27 pte pages.
> That's only 54 bits (technically minus one bit each because the upper
> half of the address space is for the kernel).
Does this math make sense for all architecures? IA64? Power?
--
Kirill A. Shutemov
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next prev parent reply other threads:[~2015-01-13 20:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-13 19:14 [PATCH 0/2] Account PMD page tables to the process Kirill A. Shutemov
2015-01-13 19:14 ` [PATCH 1/2] mm: rename mm->nr_ptes to mm->nr_pgtables Kirill A. Shutemov
2015-01-13 20:36 ` Dave Hansen
2015-01-13 20:41 ` Kirill A. Shutemov [this message]
2015-01-13 21:35 ` Dave Hansen
2015-01-13 21:43 ` Cyrill Gorcunov
2015-01-13 21:49 ` Dave Hansen
2015-01-14 9:45 ` Cyrill Gorcunov
2015-01-14 14:33 ` Kirill A. Shutemov
2015-01-14 14:48 ` Cyrill Gorcunov
2015-01-13 19:14 ` [PATCH 2/2] mm: account pmd page tables to the process Kirill A. Shutemov
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