From: John Hubbard <jhubbard@nvidia.com>
To: Leonardo Bras <leonardo@linux.ibm.com>,
<linuxppc-dev@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>,
<kvm-ppc@vger.kernel.org>, <linux-arch@vger.kernel.org>,
<linux-mm@kvack.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Arnd Bergmann <arnd@arndb.de>,
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>,
"Christophe Leroy" <christophe.leroy@c-s.fr>,
Andrew Morton <akpm@linux-foundation.org>,
Dan Williams <dan.j.williams@intel.com>,
Nicholas Piggin <npiggin@gmail.com>,
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
Allison Randal <allison@lohutok.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ganesh Goudar <ganeshgr@linux.ibm.com>,
Mike Rapoport <rppt@linux.ibm.com>,
YueHaibing <yuehaibing@huawei.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Ira Weiny" <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Keith Busch <keith.busch@intel.com>
Subject: Re: [PATCH v4 01/11] powerpc/mm: Adds counting method to monitor lockless pgtable walks
Date: Sun, 29 Sep 2019 16:17:20 -0700 [thread overview]
Message-ID: <f8fca251-e31a-1d50-49e9-e69a893d9059@nvidia.com> (raw)
In-Reply-To: <4ff1e8e8-929b-9cfc-9bf8-ee88e34de888@nvidia.com>
On 9/29/19 3:40 PM, John Hubbard wrote:
> On 9/27/19 4:39 PM, Leonardo Bras wrote:
...
> +config LOCKLESS_PAGE_TABLE_WALK_TRACKING
> + bool "Tracking (and optimization) of lockless page table walkers"
> + default n
> +
> + help
> + Maintain a reference count of active lockless page table
> + walkers. This adds 4 bytes to struct mm size, and two atomic
> + operations to calls such as get_user_pages_fast(). Some
> + architectures can optimize page table operations if this
> + is enabled.
> +
> endmenu
Actually, the above should be an internal-only config option (PPC arch can
auto-select it), so just:
+config LOCKLESS_PAGE_TABLE_WALK_TRACKING
+ bool
...because it's entirely up to other code (as opposed to other people)
as to whether this should be selected.
I got carried away. :)
thanks,
--
John Hubbard
NVIDIA
next prev parent reply other threads:[~2019-09-29 23:19 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 23:39 [PATCH v4 00/11] Introduces new count-based method for monitoring lockless pagetable walks Leonardo Bras
2019-09-27 23:39 ` [PATCH v4 01/11] powerpc/mm: Adds counting method to monitor lockless pgtable walks Leonardo Bras
2019-09-29 22:40 ` John Hubbard
2019-09-29 23:17 ` John Hubbard [this message]
2019-09-30 15:14 ` Leonardo Bras
2019-09-30 17:57 ` John Hubbard
2019-09-30 18:42 ` Leonardo Bras
2019-09-30 21:47 ` John Hubbard
2019-10-01 18:39 ` Leonardo Bras
2019-10-01 18:52 ` John Hubbard
2019-09-27 23:39 ` [PATCH v4 02/11] asm-generic/pgtable: Adds dummy functions " Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 03/11] mm/gup: Applies counting method to monitor gup_pgd_range Leonardo Bras
2019-09-30 11:09 ` Kirill A. Shutemov
2019-09-30 14:27 ` Leonardo Bras
2019-09-30 21:51 ` John Hubbard
2019-10-01 17:56 ` Leonardo Bras
2019-10-01 19:04 ` John Hubbard
2019-10-01 19:40 ` Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 05/11] powerpc/perf: " Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 06/11] powerpc/mm/book3s64/hash: " Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 07/11] powerpc/kvm/e500: " Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 08/11] powerpc/kvm/book3s_hv: " Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 09/11] powerpc/kvm/book3s_64: " Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 10/11] powerpc/book3s_64: Enables counting method to monitor lockless pgtbl walk Leonardo Bras
2019-09-27 23:40 ` [PATCH v4 11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing Leonardo Bras
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