From: Matthew Wilcox <willy@infradead.org>
To: Mike Rapoport <rppt@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Abdul Haleem <abdhalee@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Joerg Roedel <joro@8bytes.org>, Max Filippov <jcmvbkbc@gmail.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>,
Stafford Horne <shorne@gmail.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Steven Rostedt <rostedt@goodmis.org>,
linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org,
linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org,
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sparclinux@vger.kernel.org
Subject: Re: [PATCH 4/8] asm-generic: pgalloc: provide generic pmd_alloc_one() and pmd_free_one()
Date: Sat, 27 Jun 2020 20:03:04 +0100 [thread overview]
Message-ID: <20200627190304.GG25039@casper.infradead.org> (raw)
In-Reply-To: <20200627143453.31835-5-rppt@kernel.org>
On Sat, Jun 27, 2020 at 05:34:49PM +0300, Mike Rapoport wrote:
> More elaborate versions on arm64 and x86 account memory for the user page
> tables and call to pgtable_pmd_page_ctor() as the part of PMD page
> initialization.
>
> Move the arm64 version to include/asm-generic/pgalloc.h and use the generic
> version on several architectures.
>
> The pgtable_pmd_page_ctor() is a NOP when ARCH_ENABLE_SPLIT_PMD_PTLOCK is
> not enabled, so there is no functional change for most architectures except
> of the addition of __GFP_ACCOUNT for allocation of user page tables.
Thanks for including this line; it reminded me that we're not setting
the PageTable flag on the page, nor accounting it to the zone page stats.
Hope you don't mind me tagging a patch to do that on as 9/8.
We could also do with a pud_page_[cd]tor and maybe even p4d/pgd versions.
But that brings me to the next question -- could/should some of this
be moved over to asm-generic/pgalloc.h? The ctor/dtor aren't called
from anywhere else, and there's value to reducing the total amount of
code in mm.h, but then there's also value to keeping all the ifdef
ARCH_ENABLE_SPLIT_PMD_PTLOCK code together too. So I'm a bit torn.
What do you think?
next prev parent reply other threads:[~2020-06-27 19:03 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-27 14:34 [PATCH 0/8] mm: cleanup usage of <asm/pgalloc.h> Mike Rapoport
2020-06-27 14:34 ` [PATCH 1/8] mm: remove unneeded includes " Mike Rapoport
2020-06-29 15:41 ` Geert Uytterhoeven
2020-06-27 14:34 ` [PATCH 2/8] opeinrisc: switch to generic version of pte allocation Mike Rapoport
2020-06-27 21:23 ` Stafford Horne
2020-06-27 14:34 ` [PATCH 3/8] xtensa: " Mike Rapoport
2020-06-27 14:34 ` [PATCH 4/8] asm-generic: pgalloc: provide generic pmd_alloc_one() and pmd_free_one() Mike Rapoport
2020-06-27 19:03 ` Matthew Wilcox [this message]
2020-06-28 7:10 ` Mike Rapoport
2020-06-29 15:59 ` Mike Rapoport
2020-06-27 14:34 ` [PATCH 5/8] asm-generic: pgalloc: provide generic pud_alloc_one() and pud_free_one() Mike Rapoport
2020-06-27 14:34 ` [PATCH 6/8] asm-generic: pgalloc: provide generic pgd_free() Mike Rapoport
2020-06-29 15:42 ` Geert Uytterhoeven
2020-06-27 14:34 ` [PATCH 7/8] mm: move lib/ioremap.c to mm/ Mike Rapoport
2020-06-27 14:34 ` [PATCH 8/8] mm: move p?d_alloc_track to separate header file Mike Rapoport
2020-06-27 18:31 ` [PATCH 0/8] mm: cleanup usage of <asm/pgalloc.h> Matthew Wilcox
2020-06-27 18:46 ` [PATCH 9/8] mm: Account PMD tables like PTE tables Matthew Wilcox
2020-06-28 6:59 ` Mike Rapoport
2020-06-29 14:01 ` [PATCH 0/8] mm: cleanup usage of <asm/pgalloc.h> Pekka Enberg
2020-07-02 21:46 ` Mike Rapoport
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